Chirality-induced effective field in Pt/Co/MgO system with spatial anisotropy-modulation

T. Koyama, Y. Nakatani, D. Chiba

Applied Physics Letters　Vol. 120　No. 17　p. 172402-172402　2022/04/25　Research paper (scientific journal)

Biaxial strain sensing using a Pd/Co-based perpendicular flexible spin valve

Hiroki Matsumoto, Shinya Ota, Tomohiro Koyama, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 15　No. 3　2022/03　Research paper (scientific journal)

CoFeB/MgO-based magnetic tunnel junctions for film-type strain gauge

K. Saito, A. Imai, S. Ota, T. Koyama, A. Ando, D. Chiba

Applied Physics Letters　Vol. 120　No. 7　p. 072407-072407　2022/02/14　Research paper (scientific journal)

Current-induced perpendicular magnetization switching without external magnetic field in gate-induced asymmetric structure

Kento Hasegawa, Tomohiro Koyama, Daichi Chiba

Applied Physics Letters　Vol. 119　No. 20　p. 202402-202402　2021/11/15　Research paper (scientific journal)

Modification of interfacial spin-orbit torque in Co/Pt/oxide hybrid structures

Takamasa Hirai, Kento Hasegawa, Shinya Ota, Motohiro Suzuki, Tomohiro Koyama, Daichi Chiba

Physical Review B　Vol. 104　No. 13　2021/10/01　Research paper (scientific journal)

Electric-field effect on magnetic moments in Co ultra-thin films deposited on Pt

A. Obinata, T. Koyama, F. Matsukura, K. Nakamura, D. Chiba

Applied Physics Letters　Vol. 118　No. 15　p. 152405-152405　2021/04/12　Research paper (scientific journal)

Strain-induced modulation of temperature characteristics in ferrimagnetic Tb-Fe films.

Shinya Ota, Pham Van Thach, Hiroyuki Awano, Akira Ando, Kentaro Toyoki, Yoshinori Kotani, Tetsuya Nakamura, Tomohiro Koyama, Daichi Chiba

Scientific reports　Vol. 11　No. 1　p. 6237-6237　2021/03/18　Research paper (scientific journal)

Enhanced unidirectional spin Hall magnetoresistance in a Pt/Co system with a Cu interlayer

K. Hasegawa, T. Koyama, D. Chiba

Physical Review B　Vol. 103　No. 2　2021/01/28　Research paper (scientific journal)

Strain-induced cooling-heating switching of anisotropic magneto-Peltier effect

Takamasa Hirai, Hossein Sepehri-Amin, Kento Hasegawa, Tomohiro Koyama, Ryo Iguchi, Tadakatsu Ohkubo, Daichi Chiba, Ken-ichi Uchida

Applied Physics Letters　Vol. 118　No. 2　p. 022403-022403　2021/01/11　Research paper (scientific journal)

Control of magnetic anisotropy in a Co thin film on a flexible substrate by applying biaxial tensile strain

H. Matsumoto, S. Ota, T. Koyama, D. Chiba

Applied Physics Letters　Vol. 118　No. 2　p. 022406-022406　2021/01/11　Research paper (scientific journal)

Voltage control of spin–orbit torque in Pd/Co/Pd/HfO x

Takamasa Hirai, Yuki Hibino, Kento Hasegawa, Makoto Kohda, Tomohiro Koyama, Daichi Chiba

Applied Physics Express　Vol. 13　No. 12　p. 123005-123005　2020/12/01　Research paper (scientific journal)

Observation of domain wall segment jump among disorders

Takuya Taniguchi, Tomohiro Koyama, Kyoung-Hoon Kim, Daichi Chiba, Kab-Jin Kim, Teruo Ono

Journal of Magnetism and Magnetic Materials　Vol. 511　p. 166999-166999　2020/10　Research paper (scientific journal)

Orbital-dependent electric field effect on magnetism in ultrathin cobalt

Kihiro T. Yamada, Yoichi Shiota, Tomohiro Koyama, Yoshinori Kotani, Kentaro Toyoki, Hayato Mizuno, Fuyuki Ando, Kohji Nakamura, Tetsuya Nakamura, Daichi Chiba, Teruo Ono

Physical Review B　Vol. 102　No. 10　2020/09/17　Research paper (scientific journal)

Spin-orbit precession effect in a Py/Pt/Co tri-layer structure detected by ferromagnetic resonance

Yuki Hibino, Takahiro Moriyama, Kento Hasegawa, Tomohiro Koyama, Teruo Ono, Daichi Chiba

Applied Physics Express　Vol. 13　No. 8　p. 083001-083001　2020/08/01　Research paper (scientific journal)

Extended x-ray absorption fine structure spectroscopy of stretched magnetic films on flexible substrate

Shinya Ota, Takamasa Hirai, Koki Ochi, Takahiro Namazu, Toshiaki Ina, Tomohiro Koyama, Daichi Chiba

JOURNAL OF APPLIED PHYSICS　Vol. 127　No. 17　2020/05　Research paper (scientific journal)

Spin–orbit torque generated by spin–orbit precession effect in Py/Pt/Co tri-layer structure

Y. Hibino, K. Hasegawa, T. Koyama, D. Chiba

APL Materials　Vol. 8　No. 4　p. 041110-041110　2020/04/01　Research paper (scientific journal)

Electric field effect on the magnetic domain wall creep velocity in Pt/Co/Pd structures with different Co thicknesses

T. Koyama, J. Ieda, D. Chiba

Applied Physics Letters　Vol. 116　No. 9　p. 092405-092405　2020/03/02　Research paper (scientific journal)

Electric field modulation of exchange bias at the Co/Co Ox interface

T. Hirai, T. Koyama, D. Chiba

Physical Review B　Vol. 101　No. 1　2020/01/29　Research paper (scientific journal)

Flexible CoFeB/MgO-based magnetic tunnel junctions annealed at high temperature (≥350 °c)

S. Ota, A. Ando, T. Sekitani, T. Koyama, D. Chiba

Applied Physics Letters　Vol. 115　No. 20　2019/11/11　Research paper (scientific journal)

Giant gate-controlled proximity magnetoresistance in semiconductor-based ferromagnetic–non-magnetic bilayers

Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Tomohiro Koyama, Daichi Chiba, Masaaki Tanaka

Nature Physics　Vol. 15　No. 11　p. 1134-1139　2019/11/01　Research paper (scientific journal)

CoFeB/MgO-based magnetic tunnel junction directly formed on a flexible substrate

Shinya Ota, Masaki Ono, Hiroki Matsumoto, Akira Ando, Tsuyoshi Sekitani, Ryuhei Kohno, Shogo Iguchi, Tomohiro Koyama, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 12　No. 5　2019/05　Research paper (scientific journal)

Real-space and pulse-by-pulse analysis of domain wall creep induced by spin-Hall torque

Takuo Ohkochi, Kab-Jin Kim, Sanghoon Kim, Yoko Yoshimura, Hironobu Tanigawa, Norikazu Ohshima, Tomohiro Koyama, Masato Kotsugi, Daichi Chiba, Teruo Ono, Toyohiko Kinoshita

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 58　No. 2　2019/02　Research paper (scientific journal)

Gate-controlled proximity magnetoresistance in an InAs / (Ga,Fe)Sb quantum well heterostructure

Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Tomohiro Koyama, Daichi Chiba, Masaaki Tanaka

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

Solid-state capacitor for voltage control of magnetism formed on a flexible substrate

K. Ochi, T. Hirai, S. Ota, T. Koyama, T. Sekitani, D. Chiba

Japanese Journal of Applied Physics　Vol. 58　No. 11　2019　Research paper (scientific journal)

Electric-field-induced on-off switching of anomalous Ettingshausen effect in ultrathin Co films

Hiroyasu Nakayama, Takamasa Hirai, Jun Uzuhashi, Ryo Iguchi, Tadakatsu Ohkubo, Tomohiro Koyama, Daichi Chiba, Ken Ichi Uchida

Applied Physics Express　Vol. 12　No. 12　2019　Research paper (scientific journal)

Possible contribution of high-energy magnons to unidirectional magnetoresistance in metallic bilayers

Kab Jin Kim, Tian Li, Sanghoon Kim, Takahiro Moriyama, Tomohiro Koyama, Daichi Chiba, Kyung Jin Lee, Hyun Woo Lee, Teruo Ono

Applied Physics Express　Vol. 12　No. 6　2019　Research paper (scientific journal)

Electric field control of magnetic domain wall motion via modulation of the Dzyaloshinskii-Moriya interaction.

Tomohiro Koyama, Yoshinobu Nakatani, Jun'ichi Ieda, Daichi Chiba

Science advances　Vol. 4　No. 12　2018/12　Research paper (scientific journal)

Magnetic domain writing defined by electrical gating in Pt/Co film

Fuyuki Ando, Mio Ishibashi, Tomohiro Koyama, Yoichi Shiota, Takahiro Moriyama, Daichi Chiba, Teruo Ono

APPLIED PHYSICS LETTERS　Vol. 113　No. 25　2018/12　Research paper (scientific journal)

Electric field effect on magnetism in a MgO/Pd/Co system with a solid-state capacitor structure

Aya Obinata, Takamasa Hirai, Yoshinori Kotani, Kentaro Toyoki, Tetsuya Nakamura, Tomohiro Koyama, Daichi Chiba

AIP ADVANCES　Vol. 8　No. 11　2018/11　Research paper (scientific journal)

Enhancement of spin-orbit torque by inserting CoOx layer into Co/Pt interface

Hasegawa K, Hibino Y, Suzuki M, Koyama T, Chiba D

PHYSICAL REVIEW B　Vol. 98　No. 2　2018/07/12　Research paper (scientific journal)

Microscopic origin of electric-field-induced modulation of Curie temperature in cobalt

Fuyuki Ando, Kihiro T. Yamada, Tomohiro Koyama, Mio Ishibashi, Yoichi Shiota, Takahiro Moriyama, Daichi Chiba, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 11　No. 7　2018/07　Research paper (scientific journal)

Electric field effect on exchange interaction in ultrathin Co films with ionic liquids

Mio Ishibashi, Kihiro T. Yamada, Yoichi Shiota, Fuyuki Ando, Tomohiro Koyama, Haruka Kakizakai, Hayato Mizuno, Kazumoto Miwa, Shimpei Ono, Takahiro Moriyama, Daichi Chiba, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 11　No. 6　2018/06　Research paper (scientific journal)

Large current modulation and tunneling magnetoresistance change by a side-gate electric field in a GaMnAs-based vertical spin metal-oxide-semiconductor field-effect transistor.

Toshiki Kanaki, Hiroki Yamasaki, Tomohiro Koyama, Daichi Chiba, Shinobu Ohya, Masaaki Tanaka

Scientific reports　Vol. 8　No. 1　p. 7195-7195　2018/05/08　Research paper (scientific journal)

Electric-field-induced magnetic domain writing in a Co wire

Yuki Tanaka, Takamasa Hirai, Tomohiro Koyama, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 11　No. 5　2018/05　Research paper (scientific journal)

Correlation of the Dzyaloshinskii-Moriya interaction with Heisenberg exchange and orbital asphericity.

Sanghoon Kim, Kohei Ueda, Gyungchoon Go, Peong-Hwa Jang, Kyung-Jin Lee, Abderrezak Belabbes, Aurelien Manchon, Motohiro Suzuki, Yoshinori Kotani, Tetsuya Nakamura, Kohji Nakamura, Tomohiro Koyama, Daichi Chiba, Kihiro T Yamada, Duck-Ho Kim, Takahiro Moriyama, Kab-Jin Kim, Teruo Ono

Nature communications　Vol. 9　No. 1　p. 1648-1648　2018/04/25　Research paper (scientific journal)

Microscopic Investigation into the Electric Field Effect on Proximity-Induced Magnetism in Pt

K. T. Yamada, M. Suzuki, A. M. Pradipto, T. Koyama, S. Kim, K. J. Kim, S. Ono, T. Taniguchi, H. Mizuno, F. Ando, K. Oda, H. Kakizakai, T. Moriyama, K. Nakamura, D. Chiba, T. Ono

Physical Review Letters　Vol. 120　No. 15　2018/04/12　Research paper (scientific journal)

Control of magnetism by electrical charge doping or redox reactions in a surface-oxidized Co thin film with a solid-state capacitor structure

T. Hirai, T. Koyama, D. Chiba

Applied Physics Letters　Vol. 112　No. 12　2018/03/19　Research paper (scientific journal)

Electric-field effect on magnetic anisotropy in Pt/Co/Pd/MgO structures deposited on GaAs and Si substrates

Yohei Hayashi, Yuki Hibino, Fumihiro Matsukura, Kazumoto Miwa, Shimpei Ono, Takamasa Hirai, Tomohiro Koyama, Hideo Ohno, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 11　No. 1　2018/01　Research paper (scientific journal)

Influence of the magnetization reversal mechanism on the electric field modulation of coercivity in Pt/Co structures

T. Koyama, D. Chiba

PHYSICAL REVIEW B　Vol. 96　No. 22　2017/12　Research paper (scientific journal)

Electric-field-induced on/off switching of the Faraday effect

Yuki Hibino, Tomohiro Koyama, Satoshi Sumi, Hiroyuki Awano, Kazumoto Miwa, Shimpei Ono, Makoto Kohda, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 10　No. 12　2017/12　Research paper (scientific journal)

Enhancement of the spin-orbit torque in a Pt/Co system with a naturally oxidized Co layer

Y. Hibino, T. Hirai, K. Hasegawa, T. Koyama, D. Chiba

APPLIED PHYSICS LETTERS　Vol. 111　No. 13　2017/09　Research paper (scientific journal)

Current-induced magnetic domain wall motion in Pt/Co/Pd and Pd/Co/Pt structures with opposite sign of Dzyaloshinskii-Moriya interaction

Yicheng Guan, Tomohiro Koyama, Daichi Chiba

AIP ADVANCES　Vol. 7　No. 8　2017/08　Research paper (scientific journal)

Origin of threshold current density for asymmetric magnetoresistance in Pt/Py bilayers

Tian Li, Sanghoon Kim, Seung-Jae Lee, Seo-Won Lee, Tomohiro Koyama, Daichi Chiba, Takahiro Moriyama, Kyung-Jin Lee, Kab-Jin Kim, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 10　No. 7　2017/07　Research paper (scientific journal)

Influence of sloped electric field on magnetic-field-induced domain wall creep in a perpendicularly magnetized Co wire

Haruka Kakizakai, Kihiro Yamada, Fuyuki Ando, Masashi Kawaguchi, Tomohiro Koyama, Sanghoon Kim, Takahiro Moriyama, Daichi Chiba, Teruo Ono

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 56　No. 5　2017/05　Research paper (scientific journal)

Electric field modulation of magnetic anisotropy in perpendicularly magnetized Pt/Co structure with a Pd top layer (vol 8, 113002, 2015)

Yuki Hibino, Tomohiro Koyama, Aya Obinata, Kazumoto Miwa, Shimpei Ono, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 10　No. 5　2017/05

Investigation of spin-orbit torque using current-induced magnetization curve

Tomohiro Koyama, Yicheng Guan, Daichi Chiba

SCIENTIFIC REPORTS　Vol. 7　2017/04　Research paper (scientific journal)

Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

Jun Okabayashi, Tomohiro Koyama, Motohiro Suzuki, Masahito Tsujikawa, Masafumi Shirai, Daichi Chiba

SCIENTIFIC REPORTS　Vol. 7　2017/04　Research paper (scientific journal)

Magnetization switching by spin-orbit torque in Pt with proximity-induced magnetic moment

T. Koyama, Y. Guan, Y. Hibino, M. Suzuki, D. Chiba

JOURNAL OF APPLIED PHYSICS　Vol. 121　No. 12　2017/03　Research paper (scientific journal)

Electrical control of superparamagnetism

Kihiro T. Yamada, Tomohiro Koyama, Haruka Kakizakai, Kazumoto Miwa, Fuyuki Ando, Mio Ishibashi, Kab-Jin Kim, Takahiro Moriyama, Shimpei Ono, Daichi Chiba, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 10　No. 1　2017/01　Research paper (scientific journal)

Dielectric and magnetic characterizations of capacitor structures with an ionic liquid/MgO barrier and a ferromagnetic Pt electrode

D. Hayakawa, A. Obinata, K. Miwa, S. Ono, T. Hirai, T. Koyama, D. Chiba

AIP Advances　Vol. 6　No. 11　2016/11/01　Research paper (scientific journal)

Spin-dependent transport and current modulation in a current-in-plane spin-valve field-effect transistor

Toshiki Kanaki, Tomohiro Koyama, Daichi Chiba, Shinobu Ohya, Masaaki Tanaka

APPLIED PHYSICS LETTERS　Vol. 109　No. 15　2016/10　Research paper (scientific journal)

Peculiar temperature dependence of electric-field effect on magnetic anisotropy in Co/Pd/MgO system

Y. Hibino, T. Koyama, A. Obinata, T. Hirai, S. Ota, K. Miwa, S. Ono, F. Matsukura, H. Ohno, D. Chiba

Applied Physics Letters　Vol. 109　No. 8　p. 082403(1)-082403(4)　2016/08/22　Research paper (scientific journal)

Modulation of the magnetic domain size induced by an electric field

F. Ando, H. Kakizakai, T. Koyama, K. Yamada, M. Kawaguchi, S. Kim, K. J. Kim, T. Moriyama, D. Chiba, T. Ono

Applied Physics Letters　Vol. 109　No. 2　2016/07/11　Research paper (scientific journal)

Switching local magnetization by electric-field-induced domain wall motion

Haruka Kakizakai, Fuyuki Ando, Tomohiro Koyama, Kihiro Yamada, Masashi Kawaguchi, Sanghoon Kim, Kab-Jin Kim, Takahiro Moriyama, Daichi Chiba, Teruo Ono

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

Control of magnetic anisotropy in Pt/Co system using ionic liquid gating

Takamasa Hirai, Tomohiro Koyama, Aya Obinata, Yuki Hibino, Kazumoto Miwa, Shimpei Ono, Makoto Kohda, Daichi Chiba

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

Strain-induced reversible modulation of the magnetic anisotropy in perpendicularly magnetized metals deposited on a flexible substrate

Shinya Ota, Yuki Hibino, Do Bang, Hiroyuki Awano, Takahiro Kozeki, Hirokazu Akamine, Tatsuya Fujii, Takahiro Namazu, Taishi Takenobu, Tomohiro Koyama, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 9　No. 4　2016/04　Research paper (scientific journal)

Confirmation of no Structural and Chemical Changes in Curie Temperature Variable Co Ultrathin Films by Electric Field

Yusuke Wakabayashi, Hiromasa Fujii, Tsuyoshi Kimura, Osami Sakata, Hiroo Tajiri, Tomohiro Koyama, Daichi Chiba

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS　Vol. 230　No. 4　p. 569-575　2016/04　Research paper (scientific journal)

19aAU-9 Correlation between orbital magnetism and the Dzyaloshinkii-Moriya interaction

Kim Sanghoon, Ueda Kohei, Yamada Kihiro, Suzuki Motohiro, Kotani Yoshinori, Nakamura Tetsuya, Nakamura Kohji, Koyama Tomohiro, Chiba Daichi, Moriyama Takahiro, Kim Kab-Jin, Ono Teruo

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1004-1004　2016

19pPSB-23 Electric modulation of induced magnetic moment in Pt layer

Yamada K., Koyama T., Kim Sanghoon, Kawaguchi M., Ando F., M. Hayato, Kim Kab-Jin, Kakizakai H., Moriyama T., M. Kazumoto, Ono S., Suzuki M., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1149-1149　2016

19pPSB-46 Electric field induced domain wall motion in MgO/Co/Pt system

Kakizakai H., Ando F., Yamada K., Kawaguchi M., Moriyama T., Kim Kab-Jin, Koyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1172-1172　2016

19pPSB-50 Electric field modulation of current induced effective fields in ferromagnetic multiple layers

Kawaguchi M., Moriyama T., Mizuno H., Yamada K., Kakizakai H., Koyama T., Ono S., Miwa K., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1176-1176　2016

19pPSB-55 Characterization of the anisotropic g-factor in sub-nanometer Fe film by ferromagnetic resonance

Mizuno H., Moriyama T., Kawaguchi M., Tanaka K., Koyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1181-1181　2016

19pPSB-45 Deformation of domain structure induced by electric field

Ando F., Kakizakai H., Yamada K., Kawaguchi M., Koyama T., Chiba D., Kim Kab-Jin, Moriyama T., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 1171-1171　2016

Electric field effect on exchange stiffness in MgO/Co/Pt system

Ando F., Kakizakai H., Koyama T., Yamada K., Kawaguchi M., Kim S., Kim K-J., Moriyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 71　p. 981-981　2016

Modulation of magnetism induced by external stress in ultra-thin metal films on a flexible substrate

OTA Shinya, KOYAMA Tomohiro, CHIBA Daichi, ASAI Ryo, Bang Do, Awano Hiroyuki, KOZEKI Takahiro, AKAMINE Hirokazu, FUJII Tatsuya, NAMAZU Takahiro, TAKENOBU Taishi

The Proceedings of Mechanical Engineering Congress, Japan　Vol. 2016　No. 0　2016

Determination of effective field induced by spin-orbit torque using magnetic domain wall creep in Pt/Co structure

T. Koyama, D. Chiba

PHYSICAL REVIEW B　Vol. 92　No. 22　2015/12　Research paper (scientific journal)

Electric field modulation of magnetic anisotropy in perpendicularly magnetized Pt/Co structure with a Pd top layer

Yuki Hibino, Tomohiro Koyama, Aya Obinata, Kazumoto Miwa, Shimpei Ono, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 8　No. 11　2015/11　Research paper (scientific journal)

Electric-field control of magnetic moment in Pd (vol 5, 14303, 2015)

Aya Obinata, Yuki Hibino, Daichi Hayakawa, Tomohiro Koyama, Kazumoto Miwa, Shimpei Ono, Daichi Chiba

SCIENTIFIC REPORTS　Vol. 5　2015/10

Electric-field control of magnetic moment in Pd

Aya Obinata, Yuki Hibino, Daichi Hayakawa, Tomohiro Koyama, Kazumoto Miwa, Shimpei Ono, Daichi Chiba

SCIENTIFIC REPORTS　Vol. 5　2015/09　Research paper (scientific journal)

Ferromagnetic resonance measurements in sub-nanometer Fe films

Hayato Mizuno, Takahiro Moriyama, Masashi Kawaguchi, Masaki Nagata, Kensho Tanaka, Tomohiro Koyama, Daichi Chiba, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 8　No. 7　2015/07　Research paper (scientific journal)

Experimental observation of the interaction of propagating spin waves with Néel domain walls in a Landau domain structure

P. Pirro, T. Koyama, T. Brächer, T. Sebastian, B. Leven, B. Hillebrands

Applied Physics Letters　Vol. 106　No. 23　2015/06/08　Research paper (scientific journal)

Layer thickness dependence of current induced effective fields in ferromagnetic multilayers

M. Kawaguchi, T. Moriyama, T. Koyama, D. Chiba, T. Ono

JOURNAL OF APPLIED PHYSICS　Vol. 117　No. 17　2015/05　Research paper (scientific journal)

Dependence of Curie temperature on Pt layer thickness in Co/Pt system

T. Koyama, A. Obinata, Y. Hibino, A. Hirohata, B. Kuerbanjiang, V. K. Lazarov, D. Chiba

APPLIED PHYSICS LETTERS　Vol. 106　No. 13　2015/03　Research paper (scientific journal)

18pCM-2 Electric field dependence of the g-factor in Pt/Fe ultrathin films

Mizuno H., Moriyama T., Kawaguchi M., Tanaka K., Koyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 70　p. 955-955　2015

21aPS-66 Layer thickness dependence of the g-factor in Pt/Fe multilayers

Mizuno H., Moriyama T., Kawaguchi M., Nagata M., Tanaka K., Koyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 70　p. 1000-1000　2015

23pAD-12 Electric field control of magnetic properties in Pd/Co/Pt structure

Obinata A., Hibino Y., Hayakawa D., Koyama T., Miwa K., Ono S., Chiba D.

Meeting Abstracts of the Physical Society of Japan　Vol. 70　p. 1207-1207　2015

23pAD-9 Nernst effect influence on the determination of current induced effective field in ferromagnetic multiple layers

Kawaguchi M., Moriyama T., Koyama T., Chiba D., Ono T.

Meeting Abstracts of the Physical Society of Japan　Vol. 70　p. 1204-1204　2015

Operating principle of a three-terminal domain wall device with perpendicularly magnetized Ta/CoFeB/MgO free layer and underlying hard magnets

Hironobu Tanigawa, Tetsuhiro Suzuki, Katsumi Suemitsu, Norikazu Ohshima, Takuya Kitamura, Takuo Ohkochi, Masato Kotsugi, Toyohiko Kinoshita, Tomohiro Koyama, Daichi Chiba, Yoko Yoshimura, Kohei Ueda, Teruo Ono, Eiji Kariyada

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 53　No. 6　2014/06　Research paper (scientific journal)

Distribution of critical current density for magnetic domain wall motion

S. Fukami, M. Yamanouchi, Y. Nakatani, K. -J. Kim, T. Koyama, D. Chiba, S. Ikeda, N. Kasai, T. Ono, H. Ohno

JOURNAL OF APPLIED PHYSICS　Vol. 115　No. 17　2014/05　Research paper (scientific journal)

Effect of spin Hall torque on current-induced precessional domain wall motion

Yoko Yoshimura, Tomohiro Koyama, Daichi Chiba, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Hideo Ohno, Kab-Jin Kim, Takahiro Moriyama, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 7　No. 3　2014/03　Research paper (scientific journal)

Sign Reversal of Electric Field Effect on Coercivity in MgO/Co/Pt System

Tomohiro Koyama, Aya Obinata, Yuki Hibino, Daichi Chiba

APPLIED PHYSICS EXPRESS　Vol. 6　No. 12　2013/12　Research paper (scientific journal)

Domain wall pinning by a stray field from NiFe on a Co/Ni nanowire

R. Hiramatsu, T. Koyama, H. Hata, T. Ono, D. Chiba, S. Fukami, N. Ishiwata

JOURNAL OF THE KOREAN PHYSICAL SOCIETY　Vol. 63　No. 3　p. 608-611　2013/08　Research paper (scientific journal)

Nature Communications

K. J. Kim, R. Hiramatsu, T. Koyama, K. Ueda, Y. Yoshimura, D. Chiba, K. Kobayashi, Y. Nakatani, S. Fukami, M. Yamanouchi, H. Ohno, H. Kohno, G. Tatara, T. Ono

Two-barrier stability that allows low-power operation in current-induced domain-wall motion　Vol. 4　p. 1-6　2013/06/17　Research paper (scientific journal)

Two-barrier stability that allows low-power operation in current-induced domain-wall motion

Kab-Jin Kim, Ryo Hiramatsu, Tomohiro Koyama, Kohei Ueda, Yoko Yoshimura, Daichi Chiba, Kensuke Kobayashi, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Hideo Ohno, Hiroshi Kohno, Gen Tatara, Teruo Ono

NATURE COMMUNICATIONS　Vol. 4　2013/06　Research paper (scientific journal)

Current-Induced Magnetic Domain Wall Motion in a Co/Ni Nanowire with Structural Inversion Asymmetry

Tomohiro Koyama, Hiroshi Hata, Kab-Jin Kim, Takahiro Moriyama, Hironobu Tanigawa, Tetsuhiro Suzuki, Yoshinobu Nakatani, Daichi Chiba, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 6　No. 3　p. 1-33001　2013/03　Research paper (scientific journal)

Conductance Fluctuation And Weak Antilocalization In Epitaxial Bi2Se3

Sadashige Matsuo, Tomohiro Koyama, Kazutoshi Shimamura, Tomonori Arakawa, Yoshitaka Nishihara, Daichi Chiba, Kensuke Kobayashi, Teruo Ono, Cui-Zu Chang, Ke He, Xu-Cun Ma, Qi-Kun Xue

PHYSICS OF SEMICONDUCTORS　Vol. 1566　p. 193-+　2013　Research paper (international conference proceedings)

Current-induced magnetic domain wall motion below intrinsic threshold triggered by Walker breakdown

T. Koyama, K. Ueda, K. -J. Kim, Y. Yoshimura, D. Chiba, K. Yamada, J. -P. Jamet, A. Mougin, A. Thiaville, S. Mizukami, S. Fukami, N. Ishiwata, Y. Nakatani, H. Kohno, K. Kobayashi, T. Ono

NATURE NANOTECHNOLOGY　Vol. 7　No. 10　p. 635-639　2012/10　Research paper (scientific journal)

Spin waves in perpendicularly magnetized Co/Ni(111) multilayers in the presence of magnetic domains

G. Gubbiotti, G. Carlotti, S. Tacchi, M. Madami, T. Ono, T. Koyama, D. Chiba, F. Casoli, M. G. Pini

Physical Review B - Condensed Matter and Materials Physics　Vol. 86　No. 1　2012/07/05　Research paper (scientific journal)

Current-Induced Domain Wall Motion in Perpendicularly Magnetized Co/Ni Nanowire under In-Plane Magnetic Fields

Yoko Yoshimura, Tomohiro Koyama, Daichi Chiba, Yoshinobu Nakatani, Shunsuke Fukami, Michihiko Yamanouchi, Hideo Ohno, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 5　No. 6　2012/06　Research paper (scientific journal)

Temperature dependence of carrier spin polarization determined from current-induced domain wall motion in a Co/Ni nanowire

K. Ueda, T. Koyama, R. Hiramatsu, D. Chiba, S. Fukami, H. Tanigawa, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, K. Kobayashi, T. Ono

Applied Physics Letters　Vol. 100　No. 20　2012/05/14　Research paper (scientific journal)

Weak antilocalization and conductance fluctuation in a submicrometer-sized wire of epitaxial Bi 2Se 3

Sadashige Matsuo, Tomohiro Koyama, Kazutoshi Shimamura, Tomonori Arakawa, Yoshitaka Nishihara, Daichi Chiba, Kensuke Kobayashi, Teruo Ono, Cui-Zu Chang, Ke He, Xu-Cun Ma, Qi-Kun Xue

Physical Review B - Condensed Matter and Materials Physics　Vol. 85　No. 7　2012/02/29　Research paper (scientific journal)

Effect of Current on Domain Wall Depinning Field in Co/Ni Nanowire

Ryo Hiramatsu, Kouta Kondou, Tomohiro Koyama, Yoko Yoshimura, Daichi Chiba, Shunsuke Fukami, Nobuyuki Ishiwata, Teruo Ono

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 51　No. 2　2012/02　Research paper (scientific journal)

Weak antilocalization and conductance fluctuation in a submicrometer-sized wire of epitaxial Bi2Se3

Sadashige Matsuo, Tomohiro Koyama, Kazutoshi Shimamura, Tomonori Arakawa, Yoshitaka Nishihara, Daichi Chiba, Kensuke Kobayashi, Teruo Ono, Cui-Zu Chang, Ke He, Xu-Cun Ma, Qi-Kun Xue

PHYSICAL REVIEW B　Vol. 85　No. 7　2012/02　Research paper (scientific journal)

Wire Width Dependence of Threshold Current Density for Domain Wall Motion in Co/Ni Nanowires

Tomohiro Koyama, Daichi Chiba, Kohei Ueda, Hironobu Tanigawa, Shunsuke Fukami, Tetsuhiro Suzuki, Norikazu Ohshima, Nobuyuki Ishiwata, Yoshinobu Nakatani, Teruo Ono

IEEE TRANSACTIONS ON MAGNETICS　Vol. 47　No. 10　p. 3089-3091　2011/10　Research paper (scientific journal)

Real space observation of current-induced magnetic domain wall displacement in Co/Ni nano-wire by photoemission electron microscopy

N. Ohshima, T. Koyama, H. Tanigawa, M. Kotsugi, T. Ohkouchi, D. Chiba, T. Kinoshita, T. Ono

Journal of Physics Condensed Matter　Vol. 23　No. 38　2011/09/28　Research paper (scientific journal)

Electrical Investigation of Notch Width Dependence of Domain Wall Structure in Co/Ni Nanowires

Kouta Kondou, Ryo Hiramatsu, Tomohiro Koyama, Yoshinobu Nakatani, Daichi Chiba, Shunsuke Fukami, Nobuyuki Ishiwata, Teruo Ono

JAPANESE JOURNAL OF APPLIED PHYSICS　Vol. 50　No. 7　2011/07　Research paper (scientific journal)

Current-Induced Magnetic Domain Wall Motion in Co/Ni Nanowire at Low Temperature

Kohei Ueda, Tomohiro Koyama, Daichi Chiba, Kazutoshi Shimamura, Hironobu Tanigawa, Shunsuke Fukami, Tetsuhiro Suzuki, Norikazu Ohshima, Nobuyuki Ishiwata, Yoshinobu Nakatani, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 4　No. 6　2011/06　Research paper (scientific journal)

Magnetic field insensitivity of magnetic domain wall velocity induced by electrical current in Co/Ni nanowire

T. Koyama, D. Chiba, K. Ueda, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, T. Ono

APPLIED PHYSICS LETTERS　Vol. 98　No. 19　2011/05　Research paper (scientific journal)

Observation of the intrinsic pinning of a magnetic domain wall in a ferromagnetic nanowire

T. Koyama, D. Chiba, K. Ueda, K. Kondou, H. Tanigawa, S. Fukami, T. Suzuki, N. Ohshima, N. Ishiwata, Y. Nakatani, K. Kobayashi, T. Ono

NATURE MATERIALS　Vol. 10　No. 3　p. 194-197　2011/03　Research paper (scientific journal)

Control of Multiple Magnetic Domain Walls by Current in a Co/Ni Nano-Wire

Daichi Chiba, Gen Yamada, Tomohiro Koyama, Kohei Ueda, Hironobu Tanigawa, Shunsuke Fukami, Tetsuhiro Suzuki, Norikazu Ohshima, Nobuyuki Ishiwata, Yoshinobu Nakatani, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 3　No. 7　2010　Research paper (scientific journal)

Domain Wall Motion Induced by Electric Current in a Perpendicularly Magnetized Co/Ni Nano-Wire

Hironobu Tanigawa, Tomohiro Koyama, Gen Yamada, Daichi Chiba, Shinya Kasai, Shunsuke Fukami, Tetsuhiro Suzuki, Norikazu Ohshima, Nobuyuki Ishiwata, Yoshinobu Nakatani, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 2　No. 5　2009/05　Research paper (scientific journal)

Dynamical Pinning of a Domain Wall in a Magnetic Nanowire Induced by Walker Breakdown

Hironobu Tanigawa, Tomohiro Koyama, Maciej Bartkowiak, Shinya Kasai, Kensuke Kobayashi, Teruo Ono, Yoshinobu Nakatani

PHYSICAL REVIEW LETTERS　Vol. 101　No. 20　2008/11　Research paper (scientific journal)

Control of Domain Wall Position by Electrical Current in Structured Co/Ni Wire with Perpendicular Magnetic Anisotropy

Tomohiro Koyama, Gen Yamada, Hironobu Tanigawa, Shinya Kasai, Norikazu Ohshima, Shunsuke Fukami, Nobuyuki Ishiwata, Yoshinobu Nakatani, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 1　No. 10　2008/10　Research paper (scientific journal)

Current-driven domain wall motion in CoCrPt wires with perpendicular magnetic anisotropy

Hironobu Tanigawa, Kouta Kondou, Tornohiro Koyama, Kunihiro Nakano, Shinya Kasai, Norikazu Ohshima, Shunsuke Fukami, Nobuyuki Ishiwata, Teruo Ono

APPLIED PHYSICS EXPRESS　Vol. 1　No. 1　2008/01　Research paper (scientific journal)