Observation of intravalley spin scattering in a doped multivalley semiconductor

K. Hamaya, T. Okada, K. Kawashima, T. Naito, K. Oki, S. Kikuoka, Y. Wagatsuma, M. Yamada, K. Sawano

Physical Review B　Vol. 111　No. 8　2025/02/18　Research paper (scientific journal)

Epitaxial growth of CoFe/Ge stacked structures on a perpendicularly magnetized MnGa alloy

M. Nishioka, M. Yamada, D. Kumar, T. Usami, S. Yamada, S. Mizukami, K. Hamaya

Japanese Journal of Applied Physics　Vol. 64　No. 1　p. 01SP06-01SP06　2025/01/01　Research paper (scientific journal)

Artificial Control of Giant Converse Magnetoelectric Effect in Spintronic Multiferroic Heterostructure

Takamasa Usami, Yuya Sanada, Shumpei Fujii, Shinya Yamada, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamaya

Advanced Science　Vol. 12　No. 7　2024/12/25　Research paper (scientific journal)

Artificial multiferroic heterostructures—electric field effects and their perspectives

Tomoyasu Taniyama, Yoshihiro Gohda, Kohei Hamaya, Takashi Kimura

Science and Technology of Advanced Materials　Vol. 25　No. 1　p. 2412970-2412970　2024/11/05　Research paper (scientific journal)

Fabrication of crack-free strained SiGe/Ge multiple quantum wells on Ge-on-Si(111) by the patterning method

R. Kanesawa, S. Kikuoka, Y. Shibahara, Y. Wagatsuma, M. Yamada, K. Hamaya, K. Sawano

Materials Science in Semiconductor Processing　Vol. 177　p. 108300-108300　2024/07　Research paper (scientific journal)

Enhancement of room temperature electroluminescence from strained SiGe/Ge(111) multiple quantum wells light emitting diodes

Shuya Kikuoka, Rena Kanesawa, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Materials Science in Semiconductor Processing　Vol. 176　p. 108299-108299　2024/06　Research paper (scientific journal)

Al–Ge-paste-induced liquid phase epitaxy of Si-rich SiGe(111) for epitaxial Co-based Heusler alloys

Michihiro Yamada, Shota Suzuki, Ai I. Osaka, Kazuaki Sumi, Takahiro Inoue, Azusa N. Hattori, Shinya Yamada, Kentarou Sawano, Marwan Dhamrin, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 174　p. 108232-108232　2024/05　Research paper (scientific journal)

Growth of all-epitaxial Co2MnSi/Ge/Co2MnSi vertical spin-valve structures on Si

Atsuya Yamada, Michihiro Yamada, Shuhei Kusumoto, Julio A. do Nascimento, Connor Murrill, Shinya Yamada, Kentarou Sawano, Vlado K. Lazarov, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 173　p. 108140-108140　2024/04　Research paper (scientific journal)

Effect of Sn doping on low-temperature growth of Ge epilayers on half-metallic Co2FeSi

Michihiro Yamada, Shuhei Kusumoto, Atsuya Yamada, Kentarou Sawano, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 171　p. 107987-107987　2024/03　Research paper (scientific journal)

Local strain distribution analysis in strained SiGe spintronics devices

Tomoki Onabe, Zhendong Wu, Tetsuya Tohei, Yusuke Hayashi, Kazushi Sumitani, Yasuhiko Imai, Shigeru Kimura, Takahiro Naito, Kohei Hamaya, Akira Sakai

Japanese Journal of Applied Physics　Vol. 63　No. 2　p. 02SP61-02SP61　2024/01/23　Research paper (scientific journal)

Strain-induced specific orbital control in a Heusler alloy-based interfacial multiferroics

Jun Okabayashi, Takamasa Usami, Amran Mahfudh Yatmeidhy, Yuichi Murakami, Yu Shiratsuchi, Ryoichi Nakatani, Yoshihiro Gohda, Kohei Hamaya

NPG Asia Materials　Vol. 16　No. 1　2024/01/10　Research paper (scientific journal)

Metastable Co3Mn/Fe/Pb(Mg1/3Nb2/3)O3–PbTiO3 multiferroic heterostructures

Y. Murakami, T. Usami, R. Watarai, Y. Shiratsuchi, T. Kanashima, R. Nakatani, Y. Gohda, K. Hamaya

Journal of Applied Physics　Vol. 134　No. 22　2023/12/08　Research paper (scientific journal)

Electrical properties of a low-temperature fabricated Ge-based top-gate MOSFET structure with epitaxial ferromagnetic Heusler-alloy Schottky-tunnel source and drain

Keisuke Yamamoto, Takuro Matsuo, Michihiro Yamada, Youya Wagatsuma, Kentaro Sawano, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 167　p. 107763-107763　2023/11　Research paper (scientific journal)

Dzyaloshinskii-Moriya interaction at epitaxial ferromagnet/semiconductor interface

Shuto Kimura, Michihiro Yamada, Takumi Okuno, Kentarou Sawano, Kohei Hamaya, Kazuya Ando

Physical Review B　Vol. 108　No. 9　2023/09/28　Research paper (scientific journal)

Efficient Electrical Manipulation of the Magnetization Process in an Epitaxially Controlled Co2⁢FeSi/BaTiO3 Multiferroic Interface

Shaojie Hu, Shinya Yamada, Po-Chun Chang, Wen-Chin Lin, Kohei Hamaya, Takashi Kimura

Physical Review Applied　Vol. 20　No. 3　p. 034029-1-034029-8　2023/09/14　Research paper (scientific journal)

Isotropic Spin Hall Effect in an Epitaxial Ferromagnet

Nozomi Soya, Michihiro Yamada, Kohei Hamaya, Kazuya Ando

Physical Review Letters　Vol. 131　No. 7　p. 076702-1-076702-6　2023/08/17　Research paper (scientific journal)

Red Electroluminescence from Light Emitting Diodes Based on Eu-Doped ZnO Embedded in p-GaN/Al₂O₃/n-ZnO Heterostructures

Jun Tatebayashi, Kazuto Nishimura, Shuhei Ichikawa, Shinya Yamada, Yoshikata Nakajima, Kazuhisa Sato, Kohei Hamaya, Yasufumi Fujiwara

ECS Journal of Solid State Science and Technology　Vol. 12　No. 7　p. 076017-076017　2023/07/01　Research paper (scientific journal)

Half‐Metallic Heusler Alloy/GaN Heterostructure for Semiconductor Spintronics Devices

Shinya Yamada, Masatoshi Kato, Shuhei Ichikawa, Michihiro Yamada, Takahiro Naito, Yasufumi Fujiwara, Kohei Hamaya

Advanced Electronic Materials　Vol. 9　No. 7　2023/05/09　Research paper (scientific journal)

Epitaxial Co₂FeSi/LiNbO₃ multiferroic heterostructures with a low damping constant

Shinya Yamada, Takamasa Usami, Sachio Komori, Sekai Nagata, Yukio Nozaki, Tomoyasu Taniyama, Kohei Hamaya

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　2023/05　Research paper (international conference proceedings)

Converse magnetoelectric coupling coefficient greater than 10^{-6} s/m in perpendicularly magnetized Co/Pd multilayers on Pb(Mg_{1/3}Nb_{2/3})O_{3}-PbTiO_{3}

T. Usami, Y. Sanada, Y. Shiratsuchi, S. Yamada, T. Kanashima, R. Nakatani, K. Hamaya

Journal of Magnetism and Magnetic Materials　Vol. 570　No. 15　p. 170532-170532　2023/03　Research paper (scientific journal)

Scaling with MgO thickness of the proximity exchange field in a Fe/MgO/Si contact

R. Jansen, A. Spiesser, Y. Fujita, H. Saito, K. Hamaya, S. Yuasa

Physical Review B　Vol. 107　No. 2　2023/01/12　Research paper (scientific journal)

Significant reduction of crack propagation in the strained SiGe/Ge(111) induced by the local growth on the depth-controlled area patterning

Youya Wagatsuma, Rena Kanesawa, Md. Mahfuz Alam, Kazuya Okada, Takahiro Inoue, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Applied Physics Express　Vol. 16　No. 1　p. 015502-015502　2023/01/01　Research paper (scientific journal)

Giant converse magnetoelectric effect in a multiferroic heterostructure with polycrystalline Co2FeSi

Shumpei Fujii, Takamasa Usami, Yu Shiratsuchi, Adam M. Kerrigan, Amran Mahfudh Yatmeidhy, Shinya Yamada, Takeshi Kanashima, Ryoichi Nakatani, Vlado K. Lazarov, Tamio Oguchi, Yoshihiro Gohda, Kohei Hamaya

NPG Asia Materials　Vol. 14　No. 1　p. 43-43　2022/12　Research paper (scientific journal)

Epitaxial Mn<inf>2</inf>VAl films with L2<inf>1</inf>-ordered structure for all-Heusler stacks

Shinya Yamada, Kohei Kudo, Ryosuke Sadakari, Kohei Hamaya

Journal of Magnetism and Magnetic Materials　Vol. 561　p. 169644-169644　2022/11/01　Research paper (scientific journal)

Strong room-temperature EL emission from Ge-on-Si (1 1 1) diodes

Yuwa Sugiura, Masashi Sasaki, Youya Wagatsuma, Koudai Yamada, Yusuke Hoshi, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Journal of Crystal Growth　Vol. 594　p. 126766-126766　2022/09/15　Research paper (scientific journal)

Structural insight using anomalous XRD into Mn₂CoAl Heusler alloy films grown by magnetron sputtering, IBAS, and MBE techniques

Hiroo Tajiri, Loku Singgappulige Rosantha Kumara, Yuya Sakuraba, Zixi Chen, Jian Wang, Weinan Zhou, Kushwaha Varun, Kenji Ueda, Shinya Yamada, Kohei Hamaya, Kazuhiro Hono

Acta Materialia　Vol. 235　p. 118063-118063　2022/08/15　Research paper (scientific journal)

Temperature Dependence of Two-Terminal Local Magnetoresistance in Co-Based Heusler Alloy/Ge Lateral Spin-Valve Devices

Michihiro Yamada, Takahiro Naito, Kazuaki Sumi, Kentarou Sawano, Kohei Hamaya

IEEE Transactions on Magnetics　Vol. 58　No. 8　p. 1-1　2022/08/01　Research paper (scientific journal)

Effect of Strain on Room-Temperature Spin Transport in Si_0.1Ge_0.9

T. Naito, M. Yamada, Y. Wagatsuma, K. Sawano, K. Hamaya

Physical Review Applied　Vol. 18　No. 2　2022/07　Research paper (scientific journal)

Mechanism of crack formation in strained SiGe(1 1 1) layers

Youya Wagatsuma, Md Mahfuz Alam, Kazuya Okada, Rena Kanesawa, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Journal of Crystal Growth　Vol. 589　2022/07/01　Research paper (scientific journal)

Semiconductor spintronics with Co₂-Heusler compounds

Kohei Hamaya, Michihiro Yamada

MRS Bulletin　Vol. 47　No. 6　p. 584-592　2022/06　Research paper (scientific journal)

Significant effect of interfacial spin moments in ferromagnet-semiconductor heterojunctions on spin transport in a semiconductor

T. Naito, R. Nishimura, M. Yamada, A. Masago, Y. Shiratsuchi, Y. Wagatsuma, K. Sawano, R. Nakatani, T. Oguchi, K. Hamaya

Physical Review B　Vol. 105　No. 19　2022/04　Research paper (scientific journal)

Strain engineering of heteroepitaxial SiGe/Ge on Si with various crystal orientations

Md Mahfuz Alam, Youya Wagatsuma, Kazuya Okada, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

ECS Transactions　Vol. 109　No. 4　p. 197-204　2022　Research paper (international conference proceedings)

Converse magnetoelectric effect in epitaxial Co₂MnSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures

Takamasa Usami, Shumpei Fujii, Shinya Yamada, Yu Shiratsuchi, Takeshi Kanashima, Ryoichi Nakatani, Kohei Hamaya

IEEE Transactions on Magnetics　Vol. 58　No. 8　p. 1-1　2022　Research paper (scientific journal)

Magnetoresistance ratio of more than 1% at room temperature in germanium vertical spin-valve devices with Co₂FeSi

A. Yamada, M. Yamada, M. Honda, S. Yamada, K. Sawano, K. Hamaya

Applied Physics Letters　Vol. 119　No. 19　p. 192404-192404　2021/11/08　Research paper (scientific journal)

Substrate dependent reduction of Gilbert damping in annealed Heusler alloy thin films grown on group IV semiconductors

C. J. Love, B. Kuerbanjiang, A. Kerrigan, S. Yamada, K. Hamaya, G. Van Der Laan, V. K. Lazarov, S. A. Cavill

Applied Physics Letters　Vol. 119　No. 17　p. 172404-172404　2021/10/25　Research paper (scientific journal)

Superimposed contributions to two-terminal and nonlocal spin signals in lateral spin-transport devices

R. Jansen, A. Spiesser, Y. Fujita, H. Saito, S. Yamada, K. Hamaya, S. Yuasa

Physical Review B　Vol. 104　No. 14　2021/10/01　Research paper (scientific journal)

Experimental extraction of donor-driven spin relaxation in n -type nondegenerate germanium

M. Yamada, T. Ueno, T. Naito, K. Sawano, K. Hamaya

Physical Review B　Vol. 104　No. 11　2021/09/15　Research paper (scientific journal)

Effect of Fe atomic layers at the ferromagnet-semiconductor interface on temperature-dependent spin transport in semiconductors

M. Yamada, Y. Shiratsuchi, H. Kambe, K. Kudo, S. Yamada, K. Sawano, R. Nakatani, K. Hamaya

Journal of Applied Physics　Vol. 129　No. 18　2021/05/14　Research paper (scientific journal)

Room-temperature two-terminal magnetoresistance ratio reaching 0.1% in semiconductor-based lateral devices with L2<inf>1</inf>-ordered Co<inf>2</inf>MnSi

K. Kudo, M. Yamada, S. Honda, Y. Wagatsuma, S. Yamada, K. Sawano, K. Hamaya

Applied Physics Letters　Vol. 118　No. 16　p. 162404-162404　2021/04/19　Research paper (scientific journal)

Giant magnetoelectric effect in an L21-ordered Co2FeSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructure

T. Usami, S. Fujii, S. Yamada, Y. Shiratsuchi, R. Nakatani, K. Hamaya

Applied Physics Letters　Vol. 118　No. 14　p. 142402-142402　2021/04/05　Research paper (scientific journal)

Positive linear magnetoresistance effect in disordered L21B-type Mn2CoAl epitaxial films

K. Kudo, A. Masago, S. Yamada, L. S.R. Kumara, H. Tajiri, Y. Sakuraba, K. Hono, K. Hamaya

Physical Review B　Vol. 103　No. 10　p. 104427-104427　2021/03/17　Research paper (scientific journal)

Half-metallic nature of the low-temperature grown Co<inf>2</inf>MnSi films on SrTiO<inf>3</inf>

K. Kudo, S. Yamada, M. Yafuso, T. Kimura, V. K. Lazarov, K. Hamaya

Journal of Alloys and Compounds　Vol. 854　No. 15　p. 155571-155571　2021/02/15　Research paper (scientific journal)

Electric field tunable anisotropic magnetoresistance effect in an epitaxial Co2FeSi/BaTiO3 interfacial multiferroic system

S. Yamada, Y. Teramoto, D. Matsumi, D. Kepaptsoglou, I. Azaceta, T. Murata, K. Kudo, V. K. Lazarov, T. Taniyama, K. Hamaya

Physical Review Materials　Vol. 5　No. 1　p. 014412-014412　2021/01/22　Research paper (scientific journal)

A drastic increase in critical thickness for strained SiGe by growth on mesa-patterned Ge-on-Si

Youya Wagatsuma, Md. Mahfuz Alam, Kazuya Okada, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Applied Physics Express　Vol. 14　No. 2　p. 025502-025502　2021/01/15　Research paper (scientific journal)

Experimental estimation of the spin diffusion length in undoped p-Ge on Fe3Si using vertical spin-valve devices

A. Yamada, M. Yamada, T. Shiihara, M. Ikawa, S. Yamada, K. Hamaya

Journal of Applied Physics　Vol. 129　No. 1　p. 013901-013901　2021/01/05　Research paper (scientific journal)

Spin injection through energy-band symmetry matching with high spin polarization in atomically controlled ferromagnet/ferromagnet/semiconductor structures

Michihiro Yamada, Fumiaki Kuroda, Makoto Tsukahara, Shinya Yamada, Tetsuya Fukushima, Kentarou Sawano, Tamio Oguchi, Kohei Hamaya

NPG Asia Materials　Vol. 12　No. 1　p. 47-47　2020/12/01　Research paper (scientific journal)

Crack formation in strained SiGe grown on Ge-on-Si (111) and its suppression by patterning substrates

Youya Wagatsuma, Md Mahfuz Alam, Kazuya Okada, Yusuke Hoshi, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Materials Science in Semiconductor Processing　Vol. 117　p. 105153-105153　2020/10　Research paper (scientific journal)

Germanium pn junctions between ferromagnetic CoFe and Fe3Si layers for spintronic applications

Mizuki Honda, Takahiro Shiihara, Michihiro Yamada, Shinya Yamada, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 116　p. 105066-105066　2020/09　Research paper (scientific journal)

Enhancement of the Spin Hall Angle by Interdiffusion of Atoms in Co2FeAl0.5Si0.5/n-Ge Heterostructures

Shingo Kaneta-Takada, Michihiro Yamada, Shoichi Sato, Shoma Arai, Le Duc Anh, Kohei Hamaya, Shinobu Ohya

Physical Review Applied　Vol. 14　No. 2　p. 024096-024096　2020/08/31　Research paper (scientific journal)

Control of thermoelectric properties in Mn-substituted Fe2TiSi epilayers

Y. Shimanuki, S. Yamada, A. Masago, T. Ishibe, K. Kudo, Y. Nakamura, K. Hamaya

Physical Review B　Vol. 102　No. 5　p. 054203-054203　2020/08/04　Research paper (scientific journal)

Inverse local magnetoresistance effect up to room temperature in ferromagnet-semiconductor lateral spin-valve devices

Takahiro Naito, Michihiro Yamada, Shinya Yamada, Takeshi Kanashima, Kentarou Sawano, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 113　p. 105046-105046　2020/07　Research paper (scientific journal)

Growth of ferromagnetic Co2FeSi films on flexible Ge(111)

Shinya Yamada, Hidenori Higashi, Takeshi Kanashima, Kohei Hamaya

Materials Science in Semiconductor Processing　Vol. 112　p. 104997-104997　2020/06　Research paper (scientific journal)

Suppression of Donor-Driven Spin Relaxation in Strained Si0.1Ge0.9

T. Naito, M. Yamada, S. Yamada, K. Sawano, K. Hamaya

Physical Review Applied　Vol. 13　No. 5　p. 054025-054025　2020/05/11　Research paper (scientific journal)

Thermoelectric properties of single-phase full-Heusler alloy Fe<inf>2</inf>TiSi films with D 0<inf>3</inf>-type disordering

Y. Shimanuki, K. Kudo, T. Ishibe, A. Masago, S. Yamada, Y. Nakamura, K. Hamaya

Journal of Applied Physics　Vol. 127　No. 5　2020/02/07　Research paper (scientific journal)

Spin transport in antimony-doped germanium detected using vertical spin-valve structures

Takahiro Shiihara, Michihiro Yamada, Mizuki Honda, Atsuya Yamada, Shinya Yamada, Kohei Hamaya

Applied Physics Express　Vol. 13　No. 2　p. 023001-023001　2020/02/01　Research paper (scientific journal)

Strain engineering of Si/Ge heterostructures on Ge-on-Si platform

Kentarou Sawano, Youya Wagatsuma, Md Mahfuz Alam, Kaisei Omata, Kenta Niikura, Shougo Shibata, Yusuke Hoshi, Michihiro Yamada, Kohei Hamaya

ECS Transactions　Vol. 98　No. 5　p. 267-276　2020　Research paper (international conference proceedings)

Proximity exchange coupling across an MgO tunnel barrier detected via spin precession

R. Jansen, A. Spiesser, Y. Fujita, H. Saito, S. Yamada, K. Hamaya, S. Yuasa

Proceedings of SPIE - The International Society for Optical Engineering　Vol. 11470　2020　Research paper (international conference proceedings)

Increased critical thickness for strained SiGe on Ge-on-Si(111)

Youya Wagatsuma, Md Mahfuz Alam, Kazuya Okada, Yusuke Hoshi, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

ECS Transactions　Vol. 98　No. 5　p. 499-503　2020　Research paper (international conference proceedings)

Study of spin transport and magnetoresistance effect in silicon-based lateral spin devices for spin-mosfet applications

M. Ishikawa, Y. Saito, K. Hamaya

Journal of the Magnetics Society of Japan　Vol. 44　No. 3　p. 56-63　2020　Research paper (scientific journal)

Experimental verification of the origin of positive linear magnetoresistance in CoFe(V1−xMnx)Si Heusler alloys

S. Yamada, S. Kobayashi, A. Masago, L. S. R. Kumara, H. Tajiri, T. Fukushima, S. Abo, Y. Sakuraba, K. Hono, T. Oguchi, K. Hamaya

Physical Review B　Vol. 100　No. 19　p. 195137-195137　2019/11/25　Research paper (scientific journal)

Proximity exchange coupling in a Fe/MgO/Si tunnel contact detected by the inverted Hanle effect

R. Jansen, A. Spiesser, H. Saito, Y. Fujita, S. Yamada, K. Hamaya, S. Yuasa

PHYSICAL REVIEW B　Vol. 100　No. 17　2019/11　Research paper (scientific journal)

Critical thickness of strained Si<inf>1-x</inf>Ge<inf>x</inf> on Ge(111) and Ge-on-Si(111)

Md Mahfuz Alam, Youya Wagatsuma, Kazuya Okada, Yusuke Hoshi, Michihiro Yamada, Kohei Hamaya, Kentarou Sawano

Applied Physics Express　Vol. 12　No. 8　p. 081005-081005　2019/08/01　Research paper (scientific journal)

Nonmonotonic bias dependence of local spin accumulation signals in ferromagnet/semiconductor lateral spin-valve devices

Y. Fujita, M. Yamada, M. Tsukahara, T. Naito, S. Yamada, K. Sawano, K. Hamaya

Physical Review B　Vol. 100　No. 2　p. 024431-024431　2019/07/29　Research paper (scientific journal)

Hanle spin precession in a two-terminal lateral spin valve

A. Spiesser, Y. Fujita, H. Saito, S. Yamada, K. Hamaya, S. Yuasa, R. Jansen

Applied Physics Letters　Vol. 114　No. 24　2019/06/17　Research paper (scientific journal)

Quantification of Spin Drift in Devices with a Heavily Doped Si Channel

A. Spiesser, Y. Fujita, H. Saito, S. Yamada, K. Hamaya, W. Mizubayashi, K. Endo, S. Yuasa, R. Jansen

Physical Review Applied　Vol. 11　No. 4　p. 044020-044020　2019/04/08　Research paper (scientific journal)

Direct observation of pseudo-gap electronic structure in the Heusler-type Fe<inf>2</inf>VAl thin film

Hidetoshi Miyazaki, Shogo Tateishi, Masaharu Matsunami, Kazuo Soda, Shinya Yamada, Kohei Hamaya, Yoichi Nishino

Journal of Electron Spectroscopy and Related Phenomena　Vol. 232　p. 1-4　2019/04　Research paper (scientific journal)

Room-temperature local magnetoresistance effect in n-Ge devices with low-resistive Schottky-tunnel contacts

Makoto Tsukahara, Michihiro Yamada, Takahiro Naito, Shinya Yamada, Kentarou Sawano, Vlado K. Lazarov, Kohei Hamaya

Applied Physics Express　Vol. 12　No. 3　p. 033002-1-033002-4　2019/03　Research paper (scientific journal)

Significant reduction in the thermal conductivity of Si-substituted Fe2VAl epilayers

K. Kudo, S. Yamada, J. Chikada, Y. Shimanuki, T. Ishibe, S. Abo, H. Miyazaki, Y. Nishino, Y. Nakamura, K. Hamaya

Physical Review B　Vol. 99　No. 5　p. 054201-1-054201-7　2019/02/01　Research paper (scientific journal)

Magnetic and Transport Properties of Co<inf>1+x</inf>FeV<inf>1-x</inf>Si Epitaxial Films Grown by Molecular Beam Epitaxy

Shinya Yamada, Shinya Kobayashi, Keisuke Arima, Kohei Hamaya

IEEE Transactions on Magnetics　Vol. 55　No. 2　2019/02　Research paper (scientific journal)

High-quality epitaxial growth of half-metallic Co2FeSi films on a Co-terminated GaN(0001) surface

Shinya Yamada, Yuki Goto, Jun Tatebayashi, Shuhei Ichikawa, Yasufumi Fujiwara, Kohei Hamaya

2019 COMPOUND SEMICONDUCTOR WEEK (CSW)　2019　Research paper (international conference proceedings)

Magnetic and transport properties of equiatomic quaternary Heusler CoFeVSi epitaxial films

S. Yamada, S. Kobayashi, F. Kuroda, K. Kudo, S. Abo, T. Fukushima, T. Oguchi, K. Hamaya

Physical Review Materials　Vol. 2　No. 12　p. 124403-1-124403-8　2018/12/27　Research paper (scientific journal)

Nonlinear Electrical Spin Conversion in a Biased Ferromagnetic Tunnel Contact

R. Jansen, A. Spiesser, H. Saito, Y. Fujita, S. Yamada, K. Hamaya, S. Yuasa

Physical Review Applied　Vol. 10　No. 6　p. 064050-1-064050-13　2018/12/20　Research paper (scientific journal)

Crystal orientation effect on spin injection/detection efficiency in Si lateral spin-valve device

M. Ishikawa, M. Tsukahara, S. Honda, Y. Fujita, M. Yamada, Y. Saito, T. Kimura, H. Itoh, K. Hamaya

J. Phys. D: Appl. Phys.　Vol. 52　No. 8　p. 085102-1-085102-8　2018/12　Research paper (scientific journal)

Observation of local magnetoresistance signals in a SiGe-based lateral spin-valve device

Michihiro Yamada, Takahiro Naito, Makoto Tsukahara, Shinya Yamada, Kentarou Sawano, Kohei Hamaya

Semiconductor Science and Technology　Vol. 33　No. 11　2018/10/16　Research paper (scientific journal)

Local magnetoresistance at room temperature in Si <100> devices

M. Ishikawa, M. Tsukahara, M. Yamada, Y. Saito, K. Hamaya

IEEE Trans. Magn.　Vol. 54　2018/10　Research paper (scientific journal)

Epitaxial growth of Sb-doped Ge layers on ferromagnetic Fe<inf>3</inf>Si for vertical semiconductor spintronic devices

T. Shiihara, S. Oki, S. Sakai, M. Ikawa, S. Yamada, K. Hamaya

Semiconductor Science and Technology　Vol. 33　No. 10　2018/09/26　Research paper (scientific journal)

Correlation between spin transport signal and Heusler/semiconductor interface quality in lateral spin-valve devices

B. Kuerbanjiang, Y. Fujita, M. Yamada, S. Yamada, A. M. Sanchez, P. J. Hasnip, A. Ghasemi, D. Kepaptsoglou, G. Bell, K. Sawano, K. Hamaya, V. K. Lazarov

Physical Review B　Vol. 98　No. 11　p. 115304-1-115304-5　2018/09/17　Research paper (scientific journal)

Spin transport and relaxation in germanium

Kohei Hamaya, Yuichi Fujita, Michihiro Yamada, Makoto Kawano, Shinya Yamada, Kentarou Sawano

Journal of Physics D: Applied Physics　Vol. 51　No. 39　p. 393001-1-393001-17　2018/08/24　Research paper (scientific journal)

Electrical properties of pseudo-single-crystalline Ge films grown by Au-induced layer exchange crystallization at 250 °C

H. Higashi, K. Kudo, K. Yamamoto, S. Yamada, T. Kanashima, I. Tsunoda, H. Nakashima, K. Hamaya

Journal of Applied Physics　Vol. 123　No. 21　p. 215704-215704　2018/06/07　Research paper (scientific journal)

Effect of annealing on the structure and magnetic properties of Co2FeAl0.5Si0.5 thin films on Ge(111)

Balati Kuerbanjiang, Christopher Love, Demie Kepaptsoglou, Zlatko Nedelkoski, Shinya Yamada, Arsham Ghasemi, Quentin M. Ramasse, Kohei Hamaya, Stuart A. Cavill, Vlado K. Lazarov

Journal of Alloys and Compounds　Vol. 748　p. 323-327　2018/06/05　Research paper (scientific journal)

Modulation of magnetization dynamics in an epitaxial Heusler ferromagnet due to pure spin current in a laterally configured structure

Soichiro Oki, Yuta Sasaki, Yuichi Kasatani, Shinya Yamada, Shigemi Mizukami, Yukio Nozaki, Kohei Hamaya

Journal of Physics Condensed Matter　Vol. 30　No. 25　2018/05/31　Research paper (scientific journal)

Pure spin current transport in a SiGe alloy

Takahiro Naito, Michihiro Yamada, Makoto Tsukahara, Shinya Yamada, Kentarou Sawano, Kohei Hamaya

Applied Physics Express　Vol. 11　No. 5　p. 053006-053006　2018/05/01　Research paper (scientific journal)

Effect of Fe–V nonstoichiometry on electrical and thermoelectric properties of Fe2VAl films

Kohei Kudo, Shinya Yamada, Jinichiro Chikada, Yuta Shimanuki, Yoshiaki Nakamura, Kohei Hamaya

Japanese Journal of Applied Physics　Vol. 57　No. 4　p. 040306-040306　2018/04/01　Research paper (scientific journal)

Anomalous Hall conductivity and electronic structures of Si-substituted Mn2CoAl epitaxial films

K. Arima, F. Kuroda, S. Yamada, T. Fukushima, T. Oguchi, K. Hamaya

Physical Review B　Vol. 97　No. 5　p. 054427-1-054427-6　2018/02/26　Research paper (scientific journal)

Magnetic and structural depth profiles of Heusler alloy Co2FeAl0.5Si0.5 epitaxial films on Si(1 1 1)

Stephanie E. Glover, Thomas Saerbeck, Balati Kuerbanjiang, Arsham Ghasemi, Demie Kepaptsoglou, Quentin M. Ramasse, Shinya Yamada, Kohei Hamaya, Thomas P. A. Hase, Vlado K. Lazarov, Gavin R. Bell

Journal of Physics Condensed Matter　Vol. 30　No. 6　2018/01/17　Research paper (scientific journal)

Spin Absorption Effect at Ferromagnet/Ge Schottky-Tunnel Contacts

Michihiro Yamada, Yuichi Fujita, Shinya Yamada, Kentarou Sawano, Kohei Hamaya

Materials　Vol. 11　No. 1　p. 150-150　2018/01/17　Research paper (scientific journal)

Giant Spin Accumulation in Silicon Nonlocal Spin-Transport Devices

A. Spiesser, H. Saito, Y. Fujita, S. Yamada, K. Hamaya, S. Yuasa, R. Jansen

PHYSICAL REVIEW APPLIED　Vol. 8　No. 6　p. 064023-1-064023-10　2017/12　Research paper (scientific journal)

Electrical properties of epitaxial Lu- or Y-doped La2O3/La2O3/Ge high-k gate-stacks

T. Kanashima, R. Yamashiro, M. Zenitaka, K. Yamamoto, D. Wang, J. Tadano, S. Yamada, H. Nohira, H. Nakashima, K. Hamaya

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING　Vol. 70　p. 260-264　2017/11　Research paper (scientific journal)

A crystalline germanium flexible thin-film transistor

H. Higashi, M. Nakano, K. Kudo, Y. Fujita, S. Yamada, T. Kanashima, I. Tsunoda, H. Nakashima, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 111　No. 22　p. 222105-1-222105-4　2017/11　Research paper (scientific journal)

Control of electrical properties in Heusler-alloy/Ge Schottky tunnel contacts by using phosphorous delta-doping with Si-layer insertion

Michihiro Yamada, Yuichi Fujita, Shinya Yamada, Takeshi Kanashima, Ientarou Sawano, Kohei Hamaya

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING　Vol. 70　p. 83-85　2017/11　Research paper (scientific journal)

Effect of post annealing on hole mobility of pseudo-single-crystalline germanium films on glass substrates

Kenji Kasahara, Hidenori Higashi, Mario Nakano, Yuta Nagatomi, Keisuke Yamamoto, Hiroshi Nakashima, Kohei Hamaya

MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING　Vol. 70　p. 68-72　2017/11　Research paper (scientific journal)

Low thermal conductivity of thermoelectric Fe2VAl films

Shinya Yamada, Kohei Kudo, Ryo Okuhata, Jinichiro Chikada, Yoshiaki Nakamura, Kohei Hamaya

Applied Physics Express　Vol. 10　No. 11　p. 115802-115802　2017/11　Research paper (scientific journal)

Low-temperature growth of fully epitaxial CoFe/Ge/Fe3Si layers on Si for vertical-type semiconductor spintronic devices

S. Sakai, M. Kawano, M. Ikawa, H. Sato, S. Yamada, K. Hamaya

SEMICONDUCTOR SCIENCE AND TECHNOLOGY　Vol. 32　No. 9　2017/09　Research paper (scientific journal)

Room-temperature spin transport in n-Ge probed by four-terminal nonlocal measurements

Michihiro Yamada, Makoto Tsukahara, Yuichi Fujita, Takahiro Naito, Shinya Yamada, Kentarou Sawano, Kohei Hamaya

APPLIED PHYSICS EXPRESS　Vol. 10　No. 9　2017/09　Research paper (scientific journal)

Electrical detection of spin accumulation and relaxation in p-type germanium

M. Kawano, M. Ikawa, K. Santo, S. Sakai, H. Sato, S. Yamada, K. Hamaya

PHYSICAL REVIEW MATERIALS　Vol. 1　No. 3　p. 034604-1-034604-6　2017/08　Research paper (scientific journal)

Spin Transport and Relaxation up to 250 K in Heavily Doped n-Type Ge Detected Using Co2FeAl0.5Si0.5 Electrodes

Y. Fujita, M. Yamada, M. Tsukahara, T. Oka, S. Yamada, T. Kanashima, K. Sawano, K. Hamaya

PHYSICAL REVIEW APPLIED　Vol. 8　No. 1　p. 014007-1-014007-9　2017/07　Research paper (scientific journal)

Influence of the Ge diffusion on the magnetic and structural properties in Fe3Si and CoFe epilayers grown on Ge

M. Ikawa, M. Kawano, S. Sakai, S. Yamada, T. Kanashima, K. Hamaya

JOURNAL OF CRYSTAL GROWTH　Vol. 468　p. 676-679　2017/06　Research paper (scientific journal)

Robust spin-current injection in lateral spin valves with two-terminal Co2FeSi spin injectors

S. Oki, T. Kurokawa, S. Honda, S. Yamada, T. Kanashima, H. Itoh, K. Hamaya

AIP Advances　Vol. 7　No. 5　p. 055808-055808　2017/05　Research paper (scientific journal)

Large impact of impurity concentration on spin transport in degenerate n-Ge

M. Yamada, Y. Fujita, M. Tsukahara, S. Yamada, K. Sawano, K. Hamaya

PHYSICAL REVIEW B　Vol. 95　No. 16　p. 161304(R)-1-161304(R)-5　2017/04　Research paper (scientific journal)

Spin relaxation through lateral spin transport in heavily doped n-type silicon

M. Ishikawa, T. Oka, Y. Fujita, H. Sugiyama, Y. Saito, K. Hamaya

PHYSICAL REVIEW B　Vol. 95　No. 11　p. 115302-1-115302-6　2017/03　Research paper (scientific journal)

Spin signals in Si non-local transport devices with giant spin accumulation

A. Spiesser, H. Saito, Y. Fujita, S. Yamada, K. Hamaya, S. Yuasa, R. Jansen

Proceedings of SPIE - The International Society for Optical Engineering　Vol. 10357　2017　Research paper (international conference proceedings)

Temperature-independent spin relaxation in heavily doped n-type germanium

Y. Fujita, M. Yamada, S. Yamada, T. Kanashima, K. Sawano, K. Hamaya

PHYSICAL REVIEW B　Vol. 94　No. 24　2016/12　Research paper (scientific journal)

Realisation of magnetically and atomically abrupt half-metal/semiconductor interface: Co2FeSi0.5Al0.5/Ge(111)

Zlatko Nedelkoski, Balati Kuerbanjiang, Stephanie E. Glover, Ana M. Sanchez, Demie Kepaptsoglou, Arsham Ghasemi, Christopher W. Burrows, Shinya Yamada, Kohei Hamaya, Quentin M. Ramasse, Philip J. Hasnip, Thomas Hase, Gavin R. Bell, Atsufumi Hirohata, Vlado K. Lazarov

SCIENTIFIC REPORTS　Vol. 6　2016/11　Research paper (scientific journal)

The antiphase boundary in half-metallic Heusler alloy Co2Fe(Al,Si): atomic structure, spin polarization reversal, and domain wall effects

Zlatko Nedelkoski, Ana M. Sanchez, Arsham Ghasemi, Kohei Hamaya, Richard F. L. Evans, Gavin R. Bell, Atsufumi Hirohata, Vlado K. Lazarov

APPLIED PHYSICS LETTERS　Vol. 109　No. 22　2016/11　Research paper (scientific journal)

Direct evidence for suppression of the Kondo effect due to pure spin current

K. Hamaya, T. Kurokawa, S. Oki, S. Yamada, T. Kanashima, T. Taniyama

PHYSICAL REVIEW B　Vol. 94　No. 14　p. 140401(R)-1-140401(R)-5　2016/10　Research paper (scientific journal)

Controlling the half-metallicity of Heusler/Si(111) interfaces by a monolayer of Si-Co-Si

Zlatko Nedelkoski, Demie Kepaptsoglou, Arsham Ghasemi, Balati Kuerbanjiang, Philip J. Hasnip, Shinya Yamada, Kohei Hamaya, Quentin M. Ramasse, Atsufumi Hirohata, Vlado K. Lazarov

JOURNAL OF PHYSICS-CONDENSED MATTER　Vol. 28　No. 39　2016/10　Research paper (scientific journal)

Magnetic properties and interfacial characteristics of all-epitaxial Heusler-compound stacking structures

S. Yamada, S. Honda, J. Hirayama, M. Kawano, K. Santo, K. Tanikawa, T. Kanashima, H. Itoh, K. Hamaya

PHYSICAL REVIEW B　Vol. 94　No. 9　p. 094435-1-094435-7　2016/09　Research paper (scientific journal)

Structural and electrical properties of Ge(111) films grown on Si(111) substrates and application to Ge(111)-on-Insulator

K. Sawano, Y. Hoshi, S. Kubo, K. Arimoto, J. Yamanaka, K. Nakagawa, K. Hamaya, M. Miyao, Y. Shiraki

Thin Solid Films　Vol. 613　p. 24-28　2016/08/01　Research paper (scientific journal)

Spin transport in p-Ge through a vertically stacked Ge/Fe3Si junction

M. Kawano, K. Santo, M. Ikawa, S. Yamada, T. Kanashima, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 109　No. 2　p. 022406-1-022406-4　2016/07　Research paper (scientific journal)

A low-temperature fabricated gate-stack structure for Ge-based MOSFET with ferromagnetic epitaxial Heusler-alloy/Ge electrodes

Yuichi Fujita, Michihiro Yamada, Yuta Nagatomi, Keisuke Yamamoto, Shinya Yamada, Kentarou Sawano, Takeshi Kanashima, Hiroshi Nakashima, Kohei Hamaya

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 55　No. 6　2016/06　Research paper (scientific journal)

Spin injection into multilayer graphene from highly spin-polarized Co2FeSi Heusler alloy

Takehiro Yamaguchi, Rai Moriya, Soichiro Oki, Shinya Yamada, Satoru Masubuchi, Kohei Hamaya, Tomoki Machida

APPLIED PHYSICS EXPRESS　Vol. 9　No. 6　2016/06　Research paper (scientific journal)

Exchange coupling in metallic multilayers with a top FeRh layer

S. Yamada, K. Tanikawa, J. Hirayama, T. Kanashima, T. Taniyama, K. Hamaya

AIP Advances　Vol. 6　No. 5　p. 056115/1-6　2016/05/01　Research paper (international conference proceedings)

Mössbauer Analysis

K. Mibu, M. A. Tanaka, K. Hamaya

Springer Series in Materials Science 222, Heusler Alloys Chapter 14　p. 341-352　2016/04　Research paper (other academic)

The role of chemical structure on the magnetic and electronic properties of Co2FeAl0.5Si0.5/Si(111) interface

Balati Kuerbanjiang, Zlatko Nedelkoski, Demie Kepaptsoglou, Arsham Ghasemi, Stephanie E. Glover, Shinya Yamada, Thomas Saerbeck, Quentin M. Ramasse, Philip J. Hasnip, Thomas P. A. Hase, Gavin R. Bell, Kohei Hamaya, Atsufumi Hirohata, Vlado K. Lazarov

APPLIED PHYSICS LETTERS　Vol. 108　No. 17　2016/04　Research paper (scientific journal)

Silicon Spintronics for Next-Generation Devices

Kohei Hamaya

Spintronics for Next Generation Innovative Devices　p. 197-208　2016/01/08　Part of collection (book)

Finely controlled heterointerfaces between Ge(111) and metallic alloys or insulators for next generation Ge-based devices

K. Hamaya, S. Yamada, K. Kasahara, T. Kanashima

ECS Transactions　Vol. 75　No. 8　p. 651-659　2016　Research paper (international conference proceedings)

All-epitaxial Co2FeSi/Ge/Co2FeSi trilayers fabricated by Sn-induced low-temperature epitaxy

M. Kawano, M. Ikawa, K. Arima, S. Yamada, T. Kanashima, K. Hamaya

JOURNAL OF APPLIED PHYSICS　Vol. 119　No. 4　p. 045302-1-045302-6　2016/01　Research paper (scientific journal)

Finely Controlled Approaches to Formation of Heusler-Alloy/Semiconductor Heterostructures for Spintronics

Kohei Hamaya, Makoto Kawano, Yuichi Fujita, Soichiro Oki, Shinya Yamada

MATERIALS TRANSACTIONS　Vol. 57　No. 6　p. 760-766　2016　Research paper (scientific journal)

Electrical properties of pseudo-single-crystalline germanium thin-film-transistors fabricated on glass substrates

K. Kasahara, Y. Nagatomi, K. Yamamoto, H. Higashi, M. Nakano, S. Yamada, D. Wang, H. Nakashima, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 107　No. 14　p. 142102-1-142102-5　2015/10　Research paper (scientific journal)

Low-temperature B2 ordering and magnetic properties of Fe100-xRhx films on bcc alloys

S. Yamada, K. Tanikawa, J. Hirayama, T. Kanashima, T. Taniyama, K. Hamaya

PHYSICAL REVIEW B　Vol. 92　No. 9　p. 094416-1-094416-7　2015/09　Research paper (scientific journal)

Spin transport and accumulation in n+-Si using Heusler compound Co2FeSi/MgO tunnel contacts

Mizue Ishikawa, Hideyuki Sugiyama, Tomoaki Inokuchi, Kohei Hamaya, Yoshiaki Saito

Applied Physics Letters　Vol. 107　No. 9　p. 092402-092402　2015/08/31　Research paper (scientific journal)

Correlation between amplitude of spin accumulation signals investigated by Hanle effect measurement and effective junction barrier height in CoFe/MgO/n(+)-Si junctions

Y. Saito, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka

JOURNAL OF APPLIED PHYSICS　Vol. 117　No. 17　p. 17C707-01-17C707-04　2015/05　Research paper (scientific journal)

Spin-related thermoelectric conversion in lateral spin-valve devices with single-crystalline Co2FeSi electrodes

Kento Yamasaki, Soichiro Oki, Shinya Yamada, Takeshi Kanashima, Kohei Hamaya

Applied Physics Express　Vol. 8　No. 4　p. 043003-043003　2015/04　Research paper (scientific journal)

23pAD-6 Crystalline anisotropy of Gilbert damping constant for Co_2FeSi thin films

Kasatani Y., Yamada S., Itoh H., Miyao M., Hamaya K., Nozaki Y.

Meeting Abstracts of the Physical Society of Japan　Vol. 70　p. 1201-1201　2015

A pseudo-single-crystalline germanium film for flexible electronics

H. Higashi, K. Kasahara, K. Kudo, H. Okamoto, K. Moto, J. -H. Park, S. Yamada, T. Kanashima, M. Miyao, I. Tsunoda, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 106　No. 4　p. 041902-1-041902-5　2015/01　Research paper (scientific journal)

Large anisotropy of Gilbert damping constant in L21-ordered Co2FeSi film

Yuichi Kasatani, Shinya Yamada, Hiroyoshi Itoh, Masanobu Miyao, Kohei Hamaya, Yukio Nozaki

Applied Physics Express　Vol. 7　No. 12　p. 123001-123001　2014/12　Research paper (scientific journal)

An All-Epitaxial Fe₃Si/FeSi/Co₂FeSi Trilayer Grown by Room-Temperature Molecular Beam Epitaxy

Junya Hirayama, Kohei Tanikawa, Makoto Kawano, Shinya Yamada, Masanobu Miyao, Kohei Hamaya

IEEE Transactions on Magnetics　Vol. 50　No. 11　p. 1-3　2014/11　Research paper (scientific journal)

Improvement of magnetic and structural stabilities in high-quality Co2FeSi1-xAlx/Si heterointerfaces

S. Yamada, K. Tanikawa, S. Oki, M. Kawano, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 105　No. 7　p. 071601-1-071601-4　2014/08　Research paper (scientific journal)

High carrier mobility in orientation-controlled large-grain (≥50 μm) Ge directly formed on flexible plastic by nucleation-controlled gold-induced-crystallization

Jong-Hyeok Park, Kenji Kasahara, Kohei Hamaya, Masanobu Miyao, Taizoh Sadoh

Applied Physics Letters　Vol. 104　No. 25　p. 252110-252110　2014/06/23　Research paper (scientific journal)

Local magnetoresistance through Si and its bias voltage dependence in ferromagnet/MgO/silicon-on-insulator lateral spin valves

Y. Saito, T. Tanamoto, M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, N. Tezuka

Journal of Applied Physics　Vol. 115　No. 17　p. 17C514-1-17C514-3　2014/05/07　Research paper (international conference proceedings)

Formation of Ge(111) on Insulator by Ge epitaxy on Si(111) and layer transfer

K. Sawano, Y. Hoshi, S. Endo, T. Nagashima, K. Arimoto, J. Yamanaka, K. Nakagawa, S. Yamada, K. Hamaya, M. Miyao, Y. Shiraki

Thin Solid Films　Vol. 557　No. -　p. 76-79　2014/04/30　Research paper (scientific journal)

Reliable reduction of Fermi-level pinning at atomically matched metal/Ge interfaces by sulfur treatment

K. Kasahara, S. Yamada, T. Sakurai, K. Sawano, H. Nohira, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 104　No. 17　p. 172109-1-172109-4　2014/04　Research paper (scientific journal)

High-quality Co2FeSi0.5Al0.5/Si heterostructures for spin injection in silicon spintronic devices

Kohei Tanikawa, Soichiro Oki, Shinya Yamada, Makoto Kawano, Masanobu Miyao, Kohei Hamaya

THIN SOLID FILMS　Vol. 557　p. 390-393　2014/04　Research paper (scientific journal)

A magnetic tunnel junction with an L2(1)-ordered Co2FeSi electrode formed by all room-temperature fabrication processes

Yuichi Fujita, Shinya Yamada, Yuya Maeda, Masanobu Miyao, Kohei Hamaya

THIN SOLID FILMS　Vol. 557　p. 386-389　2014/04　Research paper (scientific journal)

Room-temperature electrical creation of spin accumulation in n-Ge using highly resistive Fe3Si/n(+)-Ge Schottky-tunnel contacts

Kohei Hamaya, Gotaro Takemoto, Yuzo Baba, Kenji Kasahara, Shinya Yamada, Kentarou Sawano, Masanobu Miyao

THIN SOLID FILMS　Vol. 557　p. 382-385　2014/04　Research paper (scientific journal)

Greatly enhanced generation efficiency of pure spin currents in Ge using Heusler compound Co2FeSi electrodes

Kenji Kasahara, Yuichi Fujita, Shinya Yamada, Kentarou Sawano, Masanobu Miyao, Kohei Hamaya

Applied Physics Express　Vol. 7　No. 3　p. 033002-033002　2014/03　Research paper (scientific journal)

Low-temperature grown Ge1-xSnx layers on a metallic silicide

Makoto Kawano, Shinya Yamada, Masanobu Miyao, Kohei Hamaya

2014 7th International Silicon-Germanium Technology and Device Meeting, ISTDM 2014　p. 63-64　2014　Research paper (international conference proceedings)

Effect of Sn-doped Ge insertion layers on epitaxial growth of ferromagnetic Fe3Si films on a flexible substrate

Hidenori Higashi, Yuichi Fujita, Makoto Kawano, Junya Hirayama, Shinya Yamada, Jong-Hyeok Park, Taizoh Sadoh, Masanobu Miyao, Kohei Hamaya

2014 7th International Silicon-Germanium Technology and Device Meeting, ISTDM 2014　p. 59-60　2014　Research paper (international conference proceedings)

Atomically controlled heteroepitaxy of Ge on a ferromagnetic heusler alloy for a vertical-type spin transistor

Shinya Yamada, Masanobu Miyao, Kohei Hamaya

2014 7th International Silicon-Germanium Technology and Device Meeting, ISTDM 2014　p. 55-56　2014　Research paper (international conference proceedings)

Realization of highly efficient spin injection using Fe_3Si by dynamical method

ICHIBA Kouki, ANDO Yuichiro, YAMADA Shinya, SHIKOH Eiji, SHINJO Teruya, HAMAYA Kohei, SHIRAISHI Masashi

IEICE technical report. Magnetic recording　Vol. 113　No. 407　p. 21-24　2014/01　Research paper (scientific journal)

Ion beam analysis of quaternary Heusler alloy Co2(Mn1-xFex)Si(111) epitaxially grown on Ge(111)

Yuki Kawakubo, Yuuya Noguchi, Tomoaki Hirata, Kazumasa Narumi, Seiji Sakai, Shinya Yamada, Kohei Hamaya, Masanobu Miyao, Yoshihito Maeda

Physica Status Solidi (C) Current Topics in Solid State Physics　Vol. 10　No. 12　p. 1828-1831　2013/12　Research paper (scientific journal)

Maximum magnitude in bias-dependent spin accumulation signals of CoFe/MgO/Si on insulator devices

M. Ishikawa, H. Sugiyama, T. Inokuchi, T. Tanamoto, K. Hamaya, N. Tezuka, Y. Saito

JOURNAL OF APPLIED PHYSICS　Vol. 114　No. 24　p. 243904-1-243904-6　2013/12　Research paper (scientific journal)

Lateral spin valves with two-different Heusler-alloy electrodes on the same platform

S. Oki, S. Yamada, K. Tanikawa, K. Yamasaki, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 103　No. 21　p. 212402-1-212402-4　2013/11　Research paper (scientific journal)

Giant enhancement of spin pumping efficiency using Fe3Si ferromagnet

Y. Ando, K. Ichiba, S. Yamada, E. Shikoh, T. Shinjo, K. Hamaya, M. Shiraishi

PHYSICAL REVIEW B　Vol. 88　No. 14　p. 140406-1-140406-6　2013/10　Research paper (scientific journal)

Effect of Co-Fe substitution on room-temperature spin polarization in Co3-xFexSi Heusler-compound films

K. Tanikawa, S. Oki, S. Yamada, K. Mibu, M. Miyao, K. Hamaya

PHYSICAL REVIEW B　Vol. 88　No. 1　p. 014402-1-014402-5　2013/07　Research paper (scientific journal)

Room-temperature detection of spin accumulation in silicon across Schottky tunnel barriers using a metal-oxide-semiconductor field effect transistor structure (invited)

K. Hamaya, Y. Ando, K. Masaki, Y. Maeda, Y. Fujita, S. Yamada, K. Sawano, M. Miyao

JOURNAL OF APPLIED PHYSICS　Vol. 113　No. 17　p. 17C501-1-17C501-6　2013/05　Research paper (scientific journal)

Qualitative study of temperature-dependent spin signals in n-Ge-based lateral devices with Fe3Si/n(+)-Ge Schottky-tunnel contacts

K. Hamaya, Y. Baba, G. Takemoto, K. Kasahara, S. Yamada, K. Sawano, M. Miyao

JOURNAL OF APPLIED PHYSICS　Vol. 113　No. 18　p. 183713-1-183713-7　2013/05　Research paper (scientific journal)

Room-temperature tunneling magnetoresistance in magnetic tunnel junctions with a DO3-Fe3SiElectrode

Yuichi Fujita, Shinya Yamada, Gotaro Takemoto, Soichiro Oki, Yuya Maeda, Masanobu Miyao, Kohei Hamaya

Japanese Journal of Applied Physics　Vol. 52　No. 4　2013/04　Research paper (international conference proceedings)

Molecular beam epitaxy of CO2MnSi films on group-IV semiconductors

Makoto Kawano, Shinya Yamada, Soichiro Oki, Kohei Tanikawa, Masanobu Miyao, Kohei Hamaya

Japanese Journal of Applied Physics　Vol. 52　No. 4　2013/04　Research paper (international conference proceedings)

An ultra-thin buffer layer for Ge epitaxial layers on Si

M. Kawano, S. Yamada, K. Tanikawa, K. Sawano, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 102　No. 12　p. 121908-1-121908-3　2013/03　Research paper (scientific journal)

Dynamical Spin Injection into p-Type Germanium at Room Temperature

Mariko Koike, Eiji Shikoh, Yuichiro Ando, Teruya Shinjo, Shinya Yamada, Kohei Hamaya, Masashi Shiraishi

APPLIED PHYSICS EXPRESS　Vol. 6　No. 2　2013/02　Research paper (scientific journal)

Room-temperature sign reversed spin accumulation signals in silicon-based devices using an atomically smooth Fe3Si/Si(111) contact

Y. Fujita, S. Yamada, Y. Ando, K. Sawano, H. Itoh, M. Miyao, K. Hamaya

Journal of Applied Physics　Vol. 113　No. 1　2013/01/07　Research paper (scientific journal)

Dynamical spin injection into p-type Ge at room temperature

KOIKE Mariko, SHIKOH Eiji, ANDO Yuichiro, SHINJO Teruya, YAMADA Shinya, HAMAYA Kohei, SHIRAISHI Masashi

IEICE technical report. Magnetic recording　Vol. 112　No. 416　p. 25-28　2013/01　Research paper (scientific journal)

Large electromotive force generated by spin pumping using a single-crystal Fe_3Si layer

Ando Yuichiro, Ichiba Kouki, Yamada Shinya, Shikoh Eiji, Hamaya Kohei, Shinjo Teruya, Shiraishi Masashi

Meeting abstracts of the Physical Society of Japan　Vol. 68　No. 2　p. 408-408　2013/01　Research paper (scientific journal)

Effect of the magnetic domain structure in the ferromagnetic contact on spin accumulation in silicon

Y. Ando, S. Yamada, K. Kasahara, K. Sawano, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 101　No. 23　p. 232404-1-232404-4　2012/12　Research paper (scientific journal)

Sign determination of spin polarization in L2 1-ordered Co 2FeSi using a Pt-based spin Hall device

S. Oki, K. Masaki, N. Hashimoto, S. Yamada, M. Miyata, M. Miyao, T. Kimura, K. Hamaya

Physical Review B - Condensed Matter and Materials Physics　Vol. 86　No. 17　2012/11/14　Research paper (scientific journal)

Room-temperature structural ordering of a Heusler compound Fe3Si

S. Yamada, J. Sagar, S. Honda, L. Lari, G. Takemoto, H. Itoh, A. Hirohata, K. Mibu, M. Miyao, K. Hamaya

PHYSICAL REVIEW B　Vol. 86　No. 17　p. 174406-1-174406-7　2012/11　Research paper (scientific journal)

Sign determination of spin polarization in L2(1)-ordered Co2FeSi using a Pt- based spin Hall device

S. Oki, K. Masaki, N. Hashimoto, S. Yamada, M. Miyata, M. Miyao, T. Kimura, K. Hamaya

PHYSICAL REVIEW B　Vol. 86　No. 17　p. 174412-1-174412-5　2012/11　Research paper (scientific journal)

Spin-Based MOSFETs for Logic and Memory Applications and Spin Accumulation Signals in CoFe/Tunnel Barrier/SOI Devices

Yoshiaki Saito, Mizue Ishikawa, Tomoaki Inokuchi, Hideyuki Sugiyama, Tetsufumi Tanamoto, Kohei Hamaya, Nobuki Tezuka

IEEE TRANSACTIONS ON MAGNETICS　Vol. 48　No. 11　p. 2739-2745　2012/11　Research paper (scientific journal)

Atomically Controlled Epitaxial Growth of Single-Crystalline Germanium Films on a Metallic Silicide

Shinya Yamada, Kohei Tanikawa, Masanobu Miyao, Kohei Hamaya

CRYSTAL GROWTH & DESIGN　Vol. 12　No. 10　p. 4703-4707　2012/10　Research paper (scientific journal)

Effect of the interface resistance of CoFe/MgO contacts on spin accumulation in silicon

M. Ishikawa, H. Sugiyama, T. Inokuchi, K. Hamaya, Y. Saito

APPLIED PHYSICS LETTERS　Vol. 100　No. 25　p. 252404-1-252404-3　2012/06　Research paper (scientific journal)

Effect of Addition of Al to Single-Crystalline CoFe Electrodes on Nonlocal Spin Signals in Lateral Spin-Valve Devices

Soichiro Oki, Shinya Yamada, Naoki Hashimoto, Masanobu Miyao, Takashi Kimura, Kohei Hamaya

APPLIED PHYSICS EXPRESS　Vol. 5　No. 6　p. 063004-1-063004-3　2012/06　Research paper (scientific journal)

Spin accumulation created electrically in an n-type germanium channel using Schottky tunnel contacts

K. Kasahara, Y. Baba, K. Yamane, Y. Ando, S. Yamada, Y. Hoshi, K. Sawano, M. Miyao, K. Hamaya

Journal of Applied Physics　Vol. 111　No. 7　2012/04/01　Research paper (international conference proceedings)

Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements: Comparison of Co 2FeSi and Fe 3Si

K. Hamaya, N. Hashimoto, S. Oki, S. Yamada, M. Miyao, T. Kimura

Physical Review B - Condensed Matter and Materials Physics　Vol. 85　No. 10　2012/03/13　Research paper (scientific journal)

Estimation of the spin polarization for Heusler-compound thin films by means of nonlocal spin-valve measurements: Comparison of Co2FeSi and Fe3Si

K. Hamaya, N. Hashimoto, S. Oki, S. Yamada, M. Miyao, T. Kimura

PHYSICAL REVIEW B　Vol. 85　No. 10　p. 100404(R)-1-100404(R)-5　2012/03　Research paper (scientific journal)

Room-temperature generation of giant pure spin currents using epitaxial Co2FeSi spin injectors

Takashi Kimura, Naoki Hashimoto, Shinya Yamada, Masanobu Miyao, Kohei Hamaya

NPG ASIA MATERIALS　Vol. 4　2012/03　Research paper (scientific journal)

Influence of Al co-deposition on the crystal growth of Co-based Heusler-compound thin films on Si(111)

Soichiro Oki, Shinya Yamada, Tatsuhiko Murakami, Masanobu Miyao, Kohei Hamaya

THIN SOLID FILMS　Vol. 520　No. 8　p. 3419-3422　2012/02　Research paper (scientific journal)

Generation and Detection of a Pure Spin Current using Co-Based Heusler-Alloy Spin Injector and Detector: Comparison of Co2MnSi and Co2FeSi

S. Oki, M. Kawano, K. Tanikawa, H. Aoki, S. Yamada, M. Miyao, K. Hamaya

MAGNETIC MATERIALS, PROCESSES, AND DEVICES 12　Vol. 50　No. 10　p. 245-251　2012　Research paper (international conference proceedings)

Effect of an atomically matched interface structure on Fermi-level pinning at metal/p-Ge interfaces

K. Kasahara, H. Yoshioka, Y. Tojo, T. Nishimura, S. Yamada, M. Miyao, K. Hamaya

SIGE, GE, AND RELATED COMPOUNDS 5: MATERIALS, PROCESSING, AND DEVICES　Vol. 50　No. 9　p. 223-229　2012　Research paper (international conference proceedings)

SiGe spintronics with single-crystalline ferromagnetic Schottky-tunnel contacts

K. Hamaya, S. Yamada, G. Takemoto, K. Masaki, Y. Fujita, K. Kasahara, Y. Ando, K. Sawano, M. Miyao

ECS Transactions　Vol. 50　No. 10　p. 235-243　2012　Research paper (international conference proceedings)

Temperature evolution of spin accumulation detected electrically in a nondegenerated silicon channel

Y. Ando, K. Kasahara, S. Yamada, Y. Maeda, K. Masaki, Y. Hoshi, K. Sawano, M. Miyao, K. Hamaya

PHYSICAL REVIEW B　Vol. 85　No. 3　p. 035320-1-035320-6　2012/01　Research paper (scientific journal)

Formation of Tensilely Strained Germanium-on-Insulator

Yusuke Hoshi, Kentarou Sawano, Kohei Hamaya, Masanobu Miyao, Yasuhiro Shiraki

APPLIED PHYSICS EXPRESS　Vol. 5　No. 1　p. 015701-1-015701-3　2012/01　Research paper (scientific journal)

Mechanism of Fermi level pinning at metal/germanium interfaces

K. Kasahara, S. Yamada, K. Sawano, M. Miyao, K. Hamaya

PHYSICAL REVIEW B　Vol. 84　No. 20　p. 205301-1-205301-5　2011/11　Research paper (scientific journal)

Electric-field control of spin accumulation signals in silicon at room temperature

Y. Ando, Y. Maeda, K. Kasahara, S. Yamada, K. Masaki, Y. Hoshi, K. Sawano, K. Izunome, A. Sakai, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 99　No. 13　p. 132511-1-132511-3　2011/09　Research paper (scientific journal)

Bias current dependence of spin accumulation signals in a silicon channel detected by a Schottky tunnel contact

Y. Ando, K. Kasahara, K. Yamane, Y. Baba, Y. Maeda, Y. Hoshi, K. Sawano, M. Miyao, K. Hamaya

APPLIED PHYSICS LETTERS　Vol. 99　No. 1　p. 012113-1-012113-3　2011/07　Research paper (scientific journal)

Local structural ordering in low-temperature-grown epitaxial Fe3+xSi1−xfilms on Ge(111)

K. Hamaya, T. Murakami, S. Yamada, K. Mibu, M. Miyao

Physical Review B　Vol. 83　No. 14　p. 144411-144411　2011/04/14　Research paper (scientific journal)

Low-temperature grown quaternary Heusler-compound Co2Mn1−xFexSi films on Ge(111)

S. Yamada, K. Hamaya, T. Murakami, B. Varaprasad, Y. K. Takahashi, A. Rajanikanth, K. Hono, M. Miyao

Journal of Applied Physics　Vol. 109　No. 7　p. 07B113-07B113　2011/04　Research paper (scientific journal)

Source–Drain Engineering Using Atomically Controlled Heterojunctions for Next-Generation SiGe Transistor Applications

Kohei Hamaya, Yuichiro Ando, Taizoh Sadoh, Masanobu Miyao

Japanese Journal of Applied Physics　Vol. 50　No. 1　p. 010101-010101　2011/01/20　Research paper (scientific journal)

Formation of ultra-shallow Ohmic contacts on n-Ge by Sb delta-doping

K. Sawano, Y. Hoshi, K. Kasahara, K. Yamane, K. Hamaya, M. Miyao, Y. Shiraki

Materials Research Society Symposium Proceedings　Vol. 1305　p. 30-36　2011　Research paper (international conference proceedings)

High-quality epitaxial CoFe/Si(111) heterostructures fabricated by low-temperature molecular beam epitaxy

Y. Maeda, K. Hamaya, S. Yamada, Y. Ando, K. Yamane, M. Miyao

Applied Physics Letters　Vol. 97　No. 19　p. 192501-192501　2010/11/08　Research paper (scientific journal)

Ultrashallow Ohmic contacts for n-type Ge by Sb delta-doping

K. Sawano, Y. Hoshi, K. Kasahara, K. Yamane, K. Hamaya, M. Miyao, Y. Shiraki

APPLIED PHYSICS LETTERS　Vol. 97　No. 16　2010/10　Research paper (scientific journal)

Highly Ordered Co₂FeSi Heusler Alloys Grown on Ge(111) by Low-Temperature Molecular Beam Epitaxy

K. Kasahara, K. Yamamoto, S. Yamada, T. Murakami, K. Hamaya, K. Mibu, M. Miyao

Journal of Applied Physics　Vol. 107　p. 09B05-1-09B05-3　2010/04　Research paper (scientific journal)

Effect of atomically controlled interfaces on Fermi-level pinning at metal/Ge interfaces

K. Yamane, K. Hamaya, Y. Ando, Y. Enomoto, K. Yamamoto, T. Sadoh, M. Miyao

APPLIED PHYSICS LETTERS　Vol. 96　No. 16　p. 162104-1-162104-3　2010/04　Research paper (scientific journal)

Significant growth-temperature dependence of ferromagnetic properties for Co2FeSi/Si(111) prepared by low-temperature molecular beam epitaxy

S. Yamada, K. Hamaya, K. Yamamoto, T. Murakami, K. Mibu, M. Miyao

APPLIED PHYSICS LETTERS　Vol. 96　No. 8　p. 082511-1-082511-3　2010/02　Research paper (scientific journal)

High-quality ferromagnetic CoFe/Si contacts for Si spin-transistor applications

Yuya Maeda, Shinya Yamada, Tatsuhiko Murakami, Kazutaka Yamane, Kohei Hamaya, Masanobu Miyao

TENCON 2010: 2010 IEEE REGION 10 CONFERENCE　p. 1872-1874　2010　Research paper (international conference proceedings)

Ferromagnetic Co(3-x)Fe(x)Si/Si(111) contacts with high-quality heterointerfaces for spin- transistor applications

Shinya Yamada, Tatsuhiko Murakami, Yuya Maeda, Kohei Hamaya, Masanobu Miyao

TENCON 2010: 2010 IEEE REGION 10 CONFERENCE　p. 1868-1871　2010　Research paper (international conference proceedings)

Molecular beam epitaxial growth of ferromagnetic Heusler alloys for group-IV semiconductor spintronic devices

M. Miyao, K. Hamaya, T. Sadoh, H. Itoh, Y. Maeda

THIN SOLID FILMS　Vol. 518　p. S273-S277　2010/01　Research paper (scientific journal)

Epitaxial growth of a full-Heusler alloy CO2FeSi on silicon by low-temperature molecular beam epitaxy

S. Yamada, K. Yamamoto, K. Ueda, Y. Ando, K. Hamaya, T. Sadoh, M. Miyao

THIN SOLID FILMS　Vol. 518　p. S278-S280　2010/01　Research paper (scientific journal)

Electrical detection of spin transport in Si using high-quality Fe3Si/Si Schottky tunnel contacts

Y. Ando, K. Kasahara, Y. Enomoto, T. Murakami, K. Hamaya, T. Kimura, K. Sawano, M. Miyao

Journal of the Magnetics Society of Japan　Vol. 34　No. 3　p. 316-322　2010

Comparison of Nonlocal and Local Magnetoresistance Signals in Laterally Fabricated Fe3Si/Si Spin-Valve Devices

Yuichiro Ando, Kenji Kasahara, Kazutaka Yamane, Kohei Hamaya, Kentarou Sawano, Takashi Kimura, Masanobu Miyao

APPLIED PHYSICS EXPRESS　Vol. 3　No. 9　2010　Research paper (scientific journal)

Spin-Related Current Suppression in a Semiconductor Quantum Dot Spin-Diode Structure

K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, S. Ishida, T. Taniyama, K. Hirakawa, Y. Arakawa, T. Machida

PHYSICAL REVIEW LETTERS　Vol. 102　No. 23　p. 236806-1-236806-4　2009/06　Research paper (scientific journal)

Electrical injection and detection of spin-polarized electrons in silicon through an Fe3Si/Si Schottky tunnel barrier

Y. Ando, K. Hamaya, K. Kasahara, Y. Kishi, K. Ueda, K. Sawano, T. Sadoh, M. Miyao

APPLIED PHYSICS LETTERS　Vol. 94　No. 18　p. 182105-1-182105-3　2009/05　Research paper (scientific journal)

Ferromagnetism and Electronic Structures of Nonstoichiometric Heusler-Alloy Fe3-xMnxSi Epilayers Grown on Ge(111)

K. Hamaya, H. Itoh, O. Nakatsuka, K. Ueda, K. Yamamoto, M. Itakura, T. Taniyama, T. Ono, M. Miyao

PHYSICAL REVIEW LETTERS　Vol. 102　No. 13　2009/04　Research paper (scientific journal)

Dynamic nuclear polarization induced by breakdown of fractional quantum Hall effect

Kawamura, M., Ono, M., Hashimoto, Y., Katsumoto, S., Hamaya, K., MacHida, T.

Physical Review B - Condensed Matter and Materials Physics　Vol. 79　No. 19　2009　Research paper (scientific journal)

Magnetic properties of epitaxially grown Fe3 Si/Ge (111) layers with atomically flat heterointerfaces

Y. Ando, K. Hamaya, K. Kasahara, K. Ueda, Y. Nozaki, T. Sadoh, Y. Maeda, K. Matsuyama, M. Miyao

Journal of Applied Physics　Vol. 105　No. 7　2009　Research paper (scientific journal)

Tunneling magnetoresistance effect in a few-electron quantum-dot spin valve

K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, S. Ishida, T. Taniyama, K. Hirakawa, Y. Arakawa, T. Machida

APPLIED PHYSICS LETTERS　Vol. 93　No. 22　p. 222107/1-3　2008/12　Research paper (scientific journal)

Epitaxial ferromagnetic Fe(3)Si/Si(111) structures with high-quality heterointerfaces

K. Hamaya, K. Ueda, Y. Kishi, Y. Ando, T. Sadoh, M. Miyao

APPLIED PHYSICS LETTERS　Vol. 93　No. 13　2008/09　Research paper (scientific journal)

Oscillatory changes in the tunneling magnetoresistance effect in semiconductor quantum-dot spin valves

K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, S. Ishida, T. Taniyama, K. Hirakawa, Y. Arakawa, T. Machida

PHYSICAL REVIEW B　Vol. 77　No. 8　2008/02　Research paper (scientific journal)

Dynamic nuclear polarization in a quantum Hall corbino disk

Kawamura, M., Takahashi, H., Masubuchi, S., Hashimoto, Y., Katsumoto, S., Hamaya, K., Machida, T.

Journal of the Physical Society of Japan　Vol. 77　No. 2　2008　Research paper (scientific journal)

Dynamic nuclear polarization and Knight shift measurements in a breakdown regime of integer quantum Hall effect

Kawamura, M., Takahashi, H., Masubuchi, S., Hashimoto, Y., Katsumoto, S., Hamaya, K., Machida, T.

Physica E: Low-Dimensional Systems and Nanostructures　Vol. 40　No. 5　p. 1389-1391　2008　Research paper (scientific journal)

Kondo effect in a semiconductor quantum dot coupled to ferromagnetic electrodes

K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. Machida, T. Taniyama, S. Ishida

APPLIED PHYSICS LETTERS　Vol. 91　No. 23　2007/12　Research paper (scientific journal)

Spatial distribution of Knight shift around quantum Hall edge channels using resistively-detected NMR

S. Masubuchi, K. Hamaya, T. Machida

INTERNATIONAL JOURNAL OF MODERN PHYSICS B　Vol. 21　No. 8-9　p. 1440-1444　2007/04　Research paper (scientific journal)

Electrical polarization of nuclear spins in a breakdown regime of quantum Hall effect

M. Kawamura, H. Takahashi, K. Sugihara, S. Masubuchi, K. Hamaya, T. Machida

APPLIED PHYSICS LETTERS　Vol. 90　No. 2　2007/01　Research paper (scientific journal)

Electrical coherent control of nuclear spins in a breakdown regime of quantum Hall effect

Takahashi, H., Kawamura, M., Masubuchi, S., Hamaya, K., MacHida, T., Hashimoto, Y., Katsumoto, S.

Applied Physics Letters　Vol. 91　No. 9　2007　Research paper (scientific journal)

Electric-field control of tunneling magnetoresistance effect in a NiInAsNi quantum-dot spin valve

K. Hamaya, M. Kitabatake, K. Shibata, M. Jung, M. Kawamura, K. Hirakawa, T. MacHida, T. Taniyama, S. Ishida, Y. Arakawa

Applied Physics Letters　Vol. 91　No. 2　p. 022107/1-3　2007　Research paper (scientific journal)

Spin transport through a single self-assembled InAs quantum dot with ferromagnetic leads

K. Hamaya, S. Masubuchi, M. Kawamura, T. MacHida, M. Jung, K. Shibata, K. Hirakawa, T. Taniyama, S. Ishida, Y. Arakawa

Applied Physics Letters　Vol. 90　No. 5　2007　Research paper (scientific journal)

Gate-controlled nuclear magnetic resonance in an AlGaAs/GaAs quantum Hall device

S. Masubuchi, K. Hamaya, T. Machida

APPLIED PHYSICS LETTERS　Vol. 89　No. 20　2006/11　Research paper (scientific journal)

Knight shift detection using gate-induced decoupling of the hyperfine interaction in quantum Hall edge channels

S. Masubuchi, K. Hamaya, T. Machida

APPLIED PHYSICS LETTERS　Vol. 89　No. 6　2006/08　Research paper (scientific journal)

Dynamic spin cluster relaxation in ferromagnetic (Ga, Mn)As

K. Hamaya, T. Koike, T. Taniyama, T. Fujii, Y. Kitamoto, Y. Yamazaki

Physical Review B　Vol. Vol. 73　No. No. 15　p. pp. 155204-1　2006/08

Estimation of electrically-pumped dynamic nuclear polarization in a quantum Hall device using tilted magnetic fields

Satoru Masubuchi, Kohei Hamaya, Tomoki Machida

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS　Vol. 45　No. 20-23　p. L522-L524　2006/06　Research paper (scientific journal)

Out-of-plane magnetization reversal processes of (Ga,Mn)As with two different hole concentrations

K.Hamaya, T. Taniyama, Y. Yamazaki

J. Appl. Phys.　Vol. 99　No. 9　p. 093903/1-5　2006/05

Spin-dependent edge-channel transport in a Si/SiGe quantum Hall system

K Hamaya, S Masubuchi, K Hirakawa, S Ishida, Y Arakawa, K Sawano, Y Shiraki, T Machida

PHYSICAL REVIEW B　Vol. 73　No. 12　2006/03　Research paper (scientific journal)

Estimation of dynamic nuclear polarization in quantum-Hall devices using tilted magnetic fields

S. Masubuchi, K. Hamaya, T. Machida

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　Vol. 3　No. 12　p. 4384-4387　2006　Research paper (international conference proceedings)

Local detection of Knight shift around quantum-Hall edge channels using resistively-detected NMR

S. Masubuchi, K. Hamaya, T. Machida

PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 3, NO 12　Vol. 3　No. 12　p. 4368-4371　2006　Research paper (international conference proceedings)

Magnetic anisotropy switching in (Ga,Mn)As with increasing hole concentration

K. Hamaya, T. Watanabe, T. Taniyama, A. Oiwa, Y. Kitamoto, Y. Yamazaki

Physical Review B - Condensed Matter and Materials Physics　Vol. 74　No. 4　p. 045201/1-4　2006　Research paper (scientific journal)

Dynamic relaxation of magnetic clusters in a ferromagnetic (Ga,Mn)As epilayer

K. Hamaya, T. Koike, T. Taniyama, T. Fujii, Y. Kitamoto, Y. Yamazaki

Physical Review B - Condensed Matter and Materials Physics　Vol. 73　No. 15　p. 155204/1-7　2006　Research paper (scientific journal)

Spin dependence of edge-channel transport in siliconbased quantum Hall systems

Kohei Hamaya, Satoru Masubuchi, Kentarou Sawano, Yasuhiro Shiraki, Tomoki Machida

Physica Status Solidi (C) Current Topics in Solid State Physics　Vol. 3　No. 12　p. 4251-4254　2006　Research paper (international conference proceedings)

Magnetization reversal with domain-wall pinning in (Ga, Mn)As wire

T. Koike, K. Hamaya, N. Funakoshi, Y. Takemura, Y. Kitamoto, H. Munekata

IEEE Transactions on Magnetics　Vol. 41　No. 10　p. 2742-2744　2005/10　Research paper (international conference proceedings)

Correlation between ferromagnetism and hole localization in very thin (Ga,Mn)As epilayers

K. Hamaya, Y. Kitamoto, Y. Yamazaki, T. Taniyama, R. Moriya, H. Munekata

Journal of Applied Physics　Vol. 97　No. 10　2005/05/15　Research paper (international conference proceedings)

Mixed magnetic phases in (Ga, Mn)As epilayers

K. Hamaya, T. Taniyama, Y. Kitamoto, T. Fujii, Y. Yamazaki

Physical Review Letters　Vol. 94　No. 14　2005/04　Research paper (scientific journal)

Spin selective transport at the ferromagnetic wire/GaAs interface

T Taniyama, K Hamaya, Y Yamazaki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　Vol. 286　No. 3　p. 103-107　2005/02　Research paper (scientific journal)

Magnetization reversal by electrical spin injection in ferromagnetic (Ga,Mn)As-based magnetic tunnel junctions

Rai Moriya, Kohei Hamaya, Akira Oiwa, Hiro Munekata

Journal of Superconductivity and Novel Magnetism　Vol. 18　No. 1　p. 3-7　2005　Research paper (scientific journal)

Significant Change in In-Plane Magnetic Anisotropy of (Ga,Mn)As Epilayer Induced by Low-Temperature Annealing

Kato Hiroaki, Hamaya Kohei, Taniyama Tomoyasu, Kitamoto Yoshitaka, Munekata Hiro

Jpn J Appl Phys　Vol. 43　No. 7　p. L904-L906　2004/07/01

Current-Induced Magnetization Reversal in a (Ga,Mn)As-Based Magnetic Tunnel Junction

Rai Moriya, Kohei Hamaya, Akira Oiwa, Hiro Munekata

Jpn. J. Appl. Phys.　Vol. 43　No. No. 6B　p. L825-L827　2004/06

Contribution of Shape Anisotropy to the Magnetic Configuration of (Ga, Mn)As

Hamaya Kohei, Moriya Rai, Oiwa Akira, Taniyama Tomoyasu, Kitamoto Yoshitaka, Yamazaki Yohtaro, Munekata Hiroo

Jpn J Appl Phys　Vol. 43　No. 2　p. L306-L308　2004/02/15

Magnetotransport study of temperature dependent magnetic anisotropy in a (Ga,Mn)As epilayer

K Hamaya, T Taniyama, Y Kitamoto, R Moriya, H Munekata

JOURNAL OF APPLIED PHYSICS　Vol. 94　No. 12　p. 7657-7661　2003/12　Research paper (scientific journal)

Anomalous Hall resistivity due to grain boundary in manganite thin films

T. Taniyama, K. Hamaya, Y. Kitamoto, Y. Yamazaki

J. Appl. Phys.　Vol. 93　No. 10　p. 8107-8109　2003/05

Control of magnetic features in epitaxial micro-patterned (Ga,Mn)As wire structures

K. Hamaya, R. Moriya, A. Oiwa, T. Taniyama, Y. Kitamoto, H. Munekata

Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003　Research paper (international conference proceedings)

Selective dry etching of manganite thin films for high sensitive magnetoresistive sensors

M Naoe, K Hamaya, N Fujiwara, T Taniyama, Y Kitamoto, Y Yamazaki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　Vol. 235　No. 1-3　p. 223-226　2001/10　Research paper (scientific journal)

Magnetoresistance of manganite thin films induced by reaction with substrate

K Hamaya, T Taniyama, Y Yamazaki

JOURNAL OF APPLIED PHYSICS　Vol. 89　No. 11　p. 6320-6323　2001/06　Research paper (scientific journal)

Enhanced Magnetoresistance of La_<1-x>Sr_xMnO_3 Thin Films by Reaction with Substrates

HAMAYA K., TANIYAMA T., KITAMOTO Y., YAMAZAKI Y.

Journal of the Magnetics Society of Japan　Vol. 25　No. 4　p. 727-730　2001/04/01

Great differences between low-temperature grown Co2FeSi and Co2MnSi films on single-crystalline oxides

K. Kudo, Y. Hamazaki, S. Yamada, S. Abo, Y. Gohda, K. Hamaya

ACS Appl. Electron. Mater.