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Usami Takamasa
宇佐見　喬政
Usami Takamasa
宇佐見　喬政
Institutional repository
Institute for Open and Transdisciplinary Research Initiatives, Associate Professor (Lecturer)
Institutional repository

Research History 3

  1. 2024/10 - Present
    Osaka University　Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives

  2. 2023/10 - 2024/09
    Osaka University　Center for Spintronics Research Network, Graduate School of Engineering Science　Assistant Professor

  3. 2020/04 - 2023/09
    Osaka University　Center for Spintronics Research Network, Graduate School of Engineering Science

Professional Memberships 3

  1. 日本物理学会

  2. 応用物理学会

  3. 日本磁気学会

Research Areas 2

  1. Natural sciences / Magnetism, superconductivity, and strongly correlated systems /

  2. Nanotechnology/Materials / Applied materials /

Papers 24

  1. Perpendicularly magnetized Mn60Ga40 films on Ge(001) grown at low temperature

    M. Nishioka, T. Kakutani, T. Kiire, T. Usami, S. Yamada, K. Hamaya

    Journal of Magnetism and Magnetic Materials　2025/10　Research paper (scientific journal)

  2. Piezoelectric strain-mediated control of the tunnel magnetoresistance effect in magnetic tunnel junctions with a Co2FeSi/V/PMN-PT multiferroic heterostructure

    T. Usami, Y. Kubo, K. Suzuki, S. Mizukami, K. Hamaya

    Applied Physics Letters　2025/07/21　Research paper (scientific journal)

  3. Room-temperature spin transport through band-to-band tunneling at semiconductor p - n junctions

    K. Oki, S. Ueda, T. Usami, S. Fujii, S. Kikuoka, K. Yamamoto, K. Sawano, K. Hamaya

    Physical Review Applied　2025/05/22　Research paper (scientific journal)

  4. Suppression of ferromagnetism in rippled La2/3Sr1/3MnO3 membrane with process-induced strain prepared by epitaxial lift-off technique

    Kota Kanda, Ryuji Atsumi, Takamasa Usami, Takumi Yamazaki, Kohei Ueda, Takeshi Seki, Shigeki Miyasaka, Jobu Matsuno, Junichi Shiogai

    APL Materials　2025/04/01　Research paper (scientific journal)

  5. 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　2025/02　Research paper (scientific journal)

  6. 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　2025/01/01　Research paper (scientific journal)

  7. Variation of Gilbert damping constant via interface induced magnetic anisotropy in LSMO/PMN-PT heterostructures

    Avisek Das, Mrinalini, Takamasa Usami, Satya Prakash Pati, Sachio Komori, Tomoyasu Taniyama, Venkataiah Gorige

    Journal of Alloys and Compounds　Vol. 1009　p. 176866-176866　2024/12　Research paper (scientific journal)

    Publisher: Elsevier BV

  8. 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)

    Publisher: Springer Science and Business Media LLC

  9. 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　p. 1-10　2023/12/08　Research paper (scientific journal)

    Publisher: AIP Publishing

  10. 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)

    Publisher: IEEE

  11. Growth and magnetoelectric effect of epitaxial Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3(001)

    Yuichi Murakami, Takamasa Usami, Yu Shiratsuchi, Yuya Sanada, Shinya Yamada, Ryoichi Nakatani, Kohei Hamaya

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

    Publisher: IEEE

  12. Electric and magnetic tuning of Gilbert damping constant in LSMO/PMN-PT(011) heterostructure

    Avisek Das, Mrinalini, Takamasa Usami, Satya Prakash Pati, Tomoyasu Taniyama, Venkataiah Gorige

    Journal of Physics: Condensed Matter　Vol. 35　No. 28　p. 285801-285801　2023/04/21　Research paper (scientific journal)

    Publisher: IOP Publishing

  13. Converse magnetoelectric coupling coefficient greater than 10−6 s/m in perpendicularly magnetized Co/Pd multilayers on Pb(Mg1/3Nb2/3)O3-PbTiO3

    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)

    Publisher: Elsevier BV

  14. 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)

    Publisher: Springer Science and Business Media LLC

  15. Emergence of Quasi Two-Dimensional Electronic States at the Interface of LSMO/STO via Lattice Mismatch-Induced Strains

    Satya Prakash Pati, Takamasa Usami, Sachio Komori, Tomoyasu Taniyama

    ACS Applied Electronic Materials　Vol. 4　No. 9　p. 4748-4754　2022/09/27　Research paper (scientific journal)

    Publisher: American Chemical Society ({ACS})

  16. 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. 1-5　2022/08　Research paper (scientific journal)

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

  17. Ferromagnetic phase nucleation and its growth evolution in FeRh thin films

    Aleksei S. Komlev, Dmitriy Y. Karpenkov, Dmitry A. Kiselev, Tatiana S. Ilina, Alisa Chirkova, Radel R. Gimaev, Takamasa Usami, Tomoyasu Taniyama, Vladimir I. Zverev, Nikolai S. Perov

    Journal of Alloys and Compounds　Vol. 874　p. 159924-159924　2021/09　Research paper (scientific journal)

    Publisher: Elsevier {BV}

  18. 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)

    Publisher: AIP Publishing

  19. Temperature dependence of the effective Gilbert damping constant of FeRh thin films

    T. Usami, M. Itoh, T. Taniyama

    AIP Advances　Vol. 11　No. 4　p. 045302-045302　2021/04/01　Research paper (scientific journal)

    Publisher: AIP Publishing

  20. Shear-strain-mediated large nonvolatile tuning of ferromagnetic resonance by an electric field in multiferroic heterostructures

    Ming Zheng, Takamasa Usami, Tomoyasu Taniyama

    NPG Asia Materials　Vol. 13　No. 7　2021/01/22　Research paper (scientific journal)

    Publisher: Springer Science and Business Media LLC

  21. Compositional dependence of Gilbert damping constant of epitaxial Fe<inf>100-</inf><inf>x</inf>Rh<inf>x</inf> thin films

    Usami, T., Itoh, M., Taniyama, T.

    Applied Physics Letters　Vol. 115　No. 14　p. 142403-142403　2019/10/01　Research paper (scientific journal)

    Publisher: {AIP} Publishing

  22. Magnetic properties of Single Crystal GaFeO3

    Koki Tachiyama, Shintaro Yasui, Badari Narayana Aroor Rao, Takuro Dazai, Takamasa Usami, Tomoyasu Taniyama, Tsukasa Katayama, Yosuke Hamasaki, Jianding Yu, Huan He, Hui Wang, Mitsuru Itoh

    MRS Advances　Vol. 4　No. 1　p. 61-66　2019/01/21　Research paper (scientific journal)

  23. Spin torque in FeRh alloy measured by spin-torque ferromagnetic resonance

    Tanaka, K., Moriyama, T., Usami, T., Taniyama, T., Ono, T.

    Applied Physics Express　Vol. 11　No. 1　p. 013008-013008　2018/12/22　Research paper (scientific journal)

    Publisher: IOP Publishing

  24. Transmission of spin waves in ordered FeRh epitaxial thin films

    Usami, T., Suzuki, I., Itoh, M., Taniyama, T.

    Applied Physics Letters　Vol. 108　No. 23　p. 232404-232404　2016/06/07　Research paper (scientific journal)

    Publisher: AIP Publishing

Misc. 2

  1. Detecting Modulation of Orbital Magnetic Moments and Magnetic Anisotropy via Operando X-ray Magnetic Spectroscopies

    Vol. 19　No. 3　p. 133-137　2024/06

  2. Transmission of spin waves in ordered FeRh films

    T. Usami, T. Miyauchi, K. Ichikawa, M. Itoh, T. Taniyama

    Proceeding JW-Visual 2016　Vol. 3　2016　Article, review, commentary, editorial, etc. (international conference proceedings)

Presentations 27

  1. Electric-field control of tunnel magnetoresistance ratio in magnetic tunnel junctions with a Co2FeSi/PMN-PT multiferroic heterostructure

    Takamasa Usami, Kenya Suzuki, Shigemi Mizukami, Kohei Hamya

    The 71st JSAP Spring Meeting 2024　2024/03/23

  2. Microscopic Origin of Large Magnetostriction in Galfenol Studied by Operando X-ray Magnetic Spectroscopies

    Jun Okabayashi, Takamasa Usami, Kohei Hamaya

    The 71st JSAP Spring Meeting 2024　2024/03/22

  3. An epitaxial multiferroic heterostructure composed of Co2FeSi/V/Pb(Mg1/3Nb2/3)O3-PbTiO3(011)

    Takamasa Usami, Yuya Sanada, Shinya Yamada, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamay

    MRM2023/IUMRS-ICA2023　2023/12/14

  4. Giant converse magnetoelectric effect in Co2FeSi/PMN-PT multiferroic heterostructures

    Takamasa Usami, Kohei Hamaya

    PRICM11 (The 11th Pacific Rim International Conference on Advanced Materials and Processing)　2023/11/22

  5. Low-temperature growth (~100 ℃) of magnetic Weyl semimetal Co2MnGa thin films by molecular beam epitaxy

    Sekai Nagata, Shinya Yamada, Takamasa Usami, Kunihiko Yamauchi, Tamio Oguchi, Kohei Hamaya

    2023/09/27

  6. Electric-field control of the superconducting transition temperature in V3Si/Cr/PMN-PT heterostructures

    Tomoya Aoki, Takamasa Usami, Michihiro Yamada, Kohei Hamaya

    The 84th JSAP Autumn Meeting 2023　2023/09/20

  7. Epitaxial Co2FeSi/LiNbO3 multiferroic heterostructures with a low damping constant

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

    Intermag 2023　2023/05/18

  8. Operando XMCD and EXAFS spectroscopies for orbital control by reversible strain at Co2FeSi/PMN-PT interface

    Jun Okabayashi, Takamasa Usami, Amran Yatmeidhy, Yoshihiro Gohda, Kohei Hamaya

    Intermag 2023　2023/05/17

  9. Growth and magnetoelectric effect of epitaxial Co3Mn films on piezoelectric Pb(Mg1/3Nb2/3)O3-PbTiO3(001)

    Yuichi Murakami, Takamasa Usami, Yu Shiratsuchi, Yuya Sanada, Shinya Yamada, Ryoichi Nakatani, Kohei Hamaya

    Intermag 2023　2023/05/17

  10. Operando XMCD for magnetic anisotropy control by reversible strain at Fe3Si/PMN-PT interface

    Jun Okabayashi, Takamasa Usami, Kohei Hamaya

    The 70th JSAP Spring Meeting 2023　2023/03/15

  11. Converse magnetoelectric effect in bcc Co3Mn/PMN-PT(001) multiferroic heterostructures

    Yuichi Murakami, Takamasa Usami, Yu Shiratsuchi, Yuya Sanada, Shinya Yamada, Ryoichi Nakatani, Kohei Hamaya

    The 70th JSAP Spring Meeting 2023　2023/03/17

  12. Operando XMCD and EXAFS Spectroscopies for Orbital Control by Reversible Strain at Co2FeSi/PMN-PT Interface

    Jun Okabayashi, Takamasa Usami, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamaya

    2022 MRS Fall Meeting & Exhibit　2022/12/07

  13. Giant Converse Magnetoelectric Effect in Co2-Heusler Alloy/Pb(Mg1/3Nb2/3)O3-PbTiO3 Multiferroic Heterostructures

    Takamasa Usami, Shumpei Fujii, Yu Shiratsuchi, Amran Yatmeidhy, Shinya Yamada, Takeshi Kanashima, Ryoichi Nakatani, Yoshihiro Gohda, Kohei Hamaya

    2022 MRS Fall Meeting & Exhibit　2022/11/30

  14. Operando XMCD and EXAFS spectroscopies for orbital control by reversible strain at Co2FeSi/PMN-PT interface

    Jun Okabayashi, Takamasa Usami, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamaya

    The 83rd JSAP Autumn Meeting 2022　2022/09/20

  15. オペランドXMCD,EXAFSを用いたCo2FeSi/PMN-PT界面のひずみによる軌道状態の変調の観測

    岡林潤, 宇佐見喬政, 浜屋宏平

    第25回XAFS討論会　2022/08/03

  16. Converse magnetoelectric effect in perpendicularly magnetized [Co/Pd]5/Pb(Mg1/3Nb2/3)O3-PbTiO3(011) multiferroic heterostructures

    Yuya Sanada, Takamasa Usami, Shinya Yamada, Takeshi Kanashima, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamaya

    The 69th JSAP Spring Meeting, 2022　2022/03/22

  17. Converse magnetoelectric effect in Co-based Heusler alloy/PMN-PT(011) multiferroic heterostructures

    Takamasa Usami, Shumpei Fujii, Amran Mahfudh Yatmeidhy, Yoshihiro Gohda, Jun Okabayashi, Shinya Yamada, Takeshi Kanashima, Yu Shiratsuchi, Ryoichi Nakatani, Kohei Hamaya

    The 69th JSAP Spring Meeting, 2022　2022/03/22

  18. Co2MnSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 interfacial multiferroic heterostructures

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

    2022 Joint MMM-INTERMAG　2022/01/10

  19. Electric-field modulation of the perpendicular magnetic anisotropy in the [Co/Pd] multilayer/PMN-PT

    The 26th Symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors　2021/12/20

  20. Electric-field modulation of magnetic anisotropy in epitaxial Co2FeSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures

    The Material Research Meeting 2021 (MRM2021)　2021/12/13

  21. Piezoelectric effect on anisotropic magnetoresistance in epitaxial CoFe films

    Takamasa Usami, Hiroyoshi Itoh, Shumpei Fujii, Takeshi Kanashima, Kohei Hamaya

    the 82nd JSAP Autumn Meeting　2021/09/13

  22. Crystal orientation dependence of converse magnetoelectric effect in Co2FeSi/Fe/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructures

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

    the 82nd JSAP Autumn Meeting　2021/09/13

  23. Room-temperature two-terminal magnetoresistance ratios in Ge-based vertical spin-valve devices with Co2FeSi

    Michihiro Yamada, Atsuya Yamada, Takamasa Usami, Shinya Yamada, Kentarou Sawano, Kohei Hamaya

    the 82nd JSAP Autumn Meeting　2021/09/12

  24. Electric-field modulation of the magnetic properties of Co2FeSi/Pb(Mg1/3Nb2/3)-PbTiO3 interfacial multiferroic heterostructures

    2021/01/04

  25. Fe3Si/Pb(Mg1/3Nb2/3)O3-PbTiO3構造の磁気伝導特性

    藤井竣平, 宇佐見喬政, 山田晋也, 白土優, 中谷亮一, 浜屋宏平

    第44回日本磁気学会学術講演会　2020/12/17

  26. Electric field modulation of anisotropic magnetoresistance effect in Co2FeSi/Pb(Mg1/3Nb2/3)-PbTiO3 heterostructures

    2020/12/17

  27. Electric-field modulation of anisotropic magnetoresistance effect in Heusler alloy/ Pb(Mg1/3 Nb2/3)-PbTiO3 multiferroic heterostructures

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

    The 25th symposium on the Physics and Applications of Spin-related Phenomena in Semiconductors　2020/11/18

Industrial Property Rights 2

  1. 積層体及びそれを備える磁気抵抗素子

    宇佐見喬政, 浜屋 宏平

    出願日:2023/07/13

  2. 積層体、磁気抵抗素子、および、積層体製造方法

    宇佐見喬政, 浜屋 宏平, 村上祐一

    出願日:2023/01/26

Institutional Repository 3

Content Published in the University of Osaka Institutional Repository (OUKA)

  1. Room-temperature spin transport through band-to-band tunneling at semiconductor p-n junctions

    Oki K., Ueda S., Usami T., Fujii S., Kikuoka S., Yamamoto K., Sawano K., Hamaya K.

    Physical Review Applied　Vol. 23　No. 5　2025/05/22

  2. Metastable Co₃Mn/Fe/Pb(Mg1⁄3Nb2⁄3)O3-PbTiO₃ multiferroic heterostructures

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

    Journal of Applied Physics　Vol. 134　No. 22　2023/12/08

  3. Giant magnetoelectric effect in an L 2₁-ordered Co₂FeSi/Pb(Mg₁/₃Nb₂/₃)O₃-PbTiO₃ multiferroic heterostructure

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

    Applied Physics Letters　Vol. 118　No. 14　2021/04/06