Usami Research Group
Spintronics Research Network Division,
Institute for Open and Transdisciplinary Research Initiatives,
The University of Osaka
Spintronics Research Network Division,
Institute for Open and Transdisciplinary Research Initiatives,
The University of Osaka
Takamasa Usami
Lecturer, Dr. Eng.
Spintronics Research Network Division,
Institute for Open and Transdisciplinary Research Initiatives,
The University of Osaka
Contact
✉️ usami.takamasa.es(at)osaka-u.ac.jp
Please replace “(at)” with “@” when sending an email
📞 +81-6-6850-8186
🏫1-2 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
Toyonaka Co-Creation Building A
Room #A101
Recent Updates
January 28, 2026
Our paper entitled “Orbital Magnetic Moment Controlled Converse Magnetoelectric Effect in bcc-Co3Mn/Fe/V/PMN-PT Multiferroic Heterostructures” has been published in Advanced Science (Impact Factor = 14.1, 2024). This work is the result of a collaborative research effort with Prof. Hamaya (Graduate School of Engineering Science, Univ. of Osaka), Mr. Yuichi Murakami (Master’s program graduate), Prof. Gohda (Department of Materials Science and Engineering, Science Tokyo), and Prof. Shiratsuchi (Graduate School of Engineering, Univ. of Osaka). https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202522581
December 17, 2025
The website has been launched.
T. Usami, Y. Murakami, R. Watarai, Y. Shiratsuchi, Y. Gohda, K. Hamaya, Adv. Sci. (Early view) https://advanced.onlinelibrary.wiley.com/doi/10.1002/advs.202522581
S. Yamada, T. Usami, S. Komori, Y. Miura, K. Yamanoi, Y. Nozaki, T. Taniyama and K. Hamaya, Adv. Sci. (2025) Early View. https://doi.org/10.1002/advs.202511250
T. Usami, Y. Kubo, K. Suzuki, S. Mizukami, K. Hamaya, "Piezoelectric strain-mediated control of the tunnel magnetoresistance effect in magnetic tunnel junctions with a Co2FeSi/V/PMN-PT multiferroic heterostructure", Appl. Phys. Lett. 127, 032404 (2025). https://doi.org/10.1063/5.0274897
M. Nishioka, T. Kakutani, T. Kiire, T. Usami, S. Yamada and K. Hamaya, "Perpendicularly magnetized Mn60Ga40 films on Ge(001) grown at low temperature", J. Magn. Magn. Mater. 630, 173338 (2025). https://doi.org/10.1016/j.jmmm.2025.173338
K. Oki, S. Ueda, T. Usami, S. Fujii, S. Kikuoka, K. Yamamoto, K. Sawano, K. Hamaya, "Room-temperature spin transport through band-to-band tunneling at semiconductor p - n junctions", Phys. Rev. Appl. 23, L051005 (2025). https://link.aps.org/doi/10.1103/PhysRevApplied.23.L051005
K. Kanda, R. Atsumi, T. Usami, T. Yamazaki, K. Ueda, T. Seki, S. Miyasaka, J. Matsuno, J. Shiogai, “Suppression of ferromagnetism in rippled La2/3Sr1/3MnO3 membrane with process-induced strain prepared by epitaxial lift-off technique”, APL Mater. 13 (2025). https://doi.org/10.1063/5.0263925
T. Usami, Y. Sanada, S. Fujii, S. Yamada, Y. Shiratsuchi, R. Nakatani, and K. Hamaya, “Artificial Control of Giant Converse Magnetoelectric Effect in Spintronic Multiferroic Heterostructure”, Adv. Sci. 12, 2413566 (2025). https://doi.org/10.1002/advs.202413566
M. Nishioka, M. Yamada, D. Kumar, T. Usami, S. Yamada, S. Mizukami, and K. Hamaya, “Epitaxial growth of CoFe/Ge stacked structures on a perpendicularly magnetized MnGa alloy”, Jpn. J. Appl. Phys. 64, 01SP06 (2025). https://dx.doi.org/10.35848/1347-4065/ad9d4f
A. Das, Mrinalini, T. Usami, S. P. Pati, S. Komori, T. Taniyama, and V. Gorige, “Variation of Gilbert damping constant via interface induced magnetic anisotropy in LSMO/PMN-PT heterostructures”, J. Alloys Compd. 1009, 176866 (2024). https://doi.org/10.1016/j.jallcom.2024.176866
J. Okabayashi, T. Usami, A. Mahfudh Yatmeidhy, Y. Murakami, Y. Shiratsuchi, R. Nakatani, Y. Gohda, and K. Hamaya, “Strain-induced specific orbital control in a Heusler alloy-based interfacial multiferroics”, NPG Asia Mater. 16, 3 (2024). https://doi.org/10.1038/s41427-023-00524-6
Y. Murakami, T. Usami, R. Watarai, Y. Shiratsuchi, T. Kanashima, R. Nakatani, Y. Gohda, and K. Hamaya, “Metastable Co3Mn/Fe/Pb(Mg1/3Nb2/3)O3–PbTiO3 multiferroic heterostructures”, J. Appl. Phys. 134, 224101 (2023). https://doi.org/10.1063/5.0180644
A. Das, M. Mrinalini, T. Usami, S. P. Pati, T. Taniyama, and V. Gorige, “Electric and Magnetic Tuning of Gilbert Damping Constant in LSMO/PMN-PT(011) Heterostructure”, J. Phys: Condens. Matter 35, 285801 (2023). https://dx.doi.org/10.1088/1361-648X/accc66
T. Usami, Y. Sanada, Y. Shiratsuchi, S. Yamada, T. Kanashima, R. Nakatani, and K. Hamaya, “Converse magnetoelectric coupling coefficient greater than 10-6 s/m in perpendicularly magnetized Co/Pd multilayers on Pb(Mg1/3Nb2/3)O3-PbTiO3”, J. Magn. Magn. Mater. 570, 170532 (2023). https://doi.org/10.1016/j.jmmm.2023.170532
S. Yamada, T. Usami, S. Komori, S. Nagata, Y. Nozaki, T. Taniyama and K. Hamaya, 2023 IEEE International Magnetic Conference - Short Papers https://doi.org/10.1109/INTERMAGShortPapers58606.2023.10228793
Y. Murakami, T. Usami, Y. Shiratsuchi, Y. Sanada, S. Yamada, R. Nakatani and K. Hamaya, 2023 IEEE International Magnetic Conference - Short Papers https://doi.org/10.1109/INTERMAGShortPapers58606.2023.10228416
S. Fujii, T. Usami, Y. Shiratsuchi, A. M. Kerrigan, A. M. Yatmeidhy, S. Yamada, T. Kanashima, R. Nakatani, V. K. Lazarov, T. Oguchi, Y. Gohda, and K. Hamaya, “Giant converse magnetoelectric effect in a multiferroic heterostructure with polycrystalline Co2FeSi”, NPG Asia Mater. 14, 43 (2022). https://www.nature.com/articles/s41427-022-00389-1
S. P. Pati, T. Usami, S. Komori, and T. Taniyama, “Emergence of Quasi Two-Dimensional Electronic States at the Interface of LSMO/STO via Lattice Mismatch-Induced Strains”, ACS Appl. Electron. Mater. 4, 4748 (2022). https://doi.org/10.1021/acsaelm.2c00967
T. Usami, S. Fujii, S. Yamada, Y. Shiratsuchi, T. Kanashima, R. Nakatani, and K. Hamaya, “Converse Magnetoelectric Effect in Epitaxial Co2MnSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 Multiferroic Heterostructures”, IEEE Trans. Magn. 58, 1 (2022). https://ieeexplore.ieee.org/document/9690470
M. Zheng, T. Usami, and T. Taniyama, “Shear-strain-mediated large nonvolatile tuning of ferromagnetic resonance by an electric field in multiferroic heterostructures”, NPG Asia Mater. 13, 7 (2021). https://doi.org/10.1038/s41427-020-00279-4
A. S. Komlev, D. Y. Karpenkov, D. A. Kiselev, T. S. Ilina, A. Chirkova, R. R. Gimaev, T. Usami, T. Taniyama, V. I. Zverev, and N. S. Perov, “Ferromagnetic phase nucleation and its growth evolution in FeRh thin films”, J. Alloys Compd. 874, 159924 (2021). https://doi.org/10.1016/j.jallcom.2021.159924
T. Usami, S. Fujii, S. Yamada, Y. Shiratsuchi, R. Nakatani, and K. Hamaya, “Giant magnetoelectric effect in an L21-ordered Co2FeSi/Pb(Mg1/3Nb2/3)O3-PbTiO3 multiferroic heterostructure”, Appl. Phys. Lett. 118, 142402 (2021). https://doi.org/10.1063/5.0044094
T. Usami, M. Itoh, and T. Taniyama, “Temperature dependence of the effective Gilbert damping constant of FeRh thin films”, AIP Adv. 11, 045302 (2021). https://doi.org/10.1063/5.0039577
T. Usami, M. Itoh, and T. Taniyama, “Compositional dependence of Gilbert damping constant of epitaxial Fe100-xRhx thin films”, Appl. Phys. Lett. 115, 142403 (2019). https://doi.org/10.1063/1.5120597
K. Tachiyama, S. Yasui, WB. N. Aroor Rao, T. Dazai, T. Usami, T. Taniyama, T. Katayama, Y. Hamasaki, J. Yu, H. He, H. Wang, and M. Itoh, “Magnetic properties oSingle Crystal GaFeO3”, MRS Adv. 4, 61 (2019). https://doi.org/10.1557/adv.2019.37
K. Tanaka, T. Moriyama, T. Usami, T. Taniyama, and T. Ono, “Spin torque in FeRh alloy measured by spin-torque ferromagnetic resonance”, Appl. Phys. Express 11, 013008 (2018). https://dx.doi.org/10.7567/APEX.11.013008
T. Usami, I. Suzuki, M. Itoh, and T. Taniyama, “Transmission of spin waves in ordered FeRh epitaxial thin films”, Appl. Phys. Lett. 108, 232404 (2016). https://doi.org/10.1063/1.4953464