Details of the Researcher

PHOTO

Atsufumi Hirohata
Section
Center for Science and Innovation in Spintronics
Job title
Professor
Degree
Researcher ID
B-4595-2009

Research History 9

  • 2024/04 - Present
    Max Planck Institute for Chemical Physics of Solids

  • 2023/10 - Present
    Tohoku University　Center for Science and Innovation in Spintronics　Professor

  • 2014/10 - 2023/09
    University of York　Department of Electronic Engineering　Professor

  • 2011/10 - 2014/09
    University of York　Department of Electronics　Reader

  • 2007/09 - 2011/09
    University of York　Department of Electronics　Lecturer

  • 2005/04 - 2007/08
    RIKEN　Frontier Research System　Researcher

  • 2003/04 - 2005/03
    Tohoku University　Department of Materials Science　Researcher

  • 2002/02 - 2003/03
    Massachusetts Institute of Technology　Francis Bitter Magnet Laboratory　Post-doctoral Associate

  • 2001/09 - 2002/02
    University of Cambridge　Cavendish Laboratory　Research Associate

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Education 4

  • ケンブリッジ大学　理学研究科　物理学専攻

    - 2001

  • University of Cambridge　Graduate School, Division of Natural Science

    - 2001

  • Keio University　Graduate School of Science and Technology

    - 1997

  • Keio University　Faculty of Science and Technology　Department of Physics

    - 1995

Professional Memberships 10

  • 日本応用物理学会

  • American Association for the Advancement of Science

  • American Physical Society

  • Institute of Electrical and Electronics Engineering

  • Cambridge Overseas Society

  • Materials Research Society

  • Cambridge Philosophical Society

  • Institute of Physics

  • 日本物理学会

  • 日本応用磁気学会

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Research Interests 2

  • 磁性薄膜

  • スピントロニクス

Research Areas 3

  • Nanotechnology/Materials / Nano/micro-systems / Spintronics

  • Nanotechnology/Materials / Metallic materials / Magnetic Materials

  • Natural sciences / Semiconductors, optical and atomic physics / Magnetism

Awards 2

  1. Finalist of the Best Student Presentation Award in the MMM-Intermag Conference

    2001

  2. Materials Research Society Graduate Student Silver Award

    1999

Papers 140

  1. Compensated ferrimagnetic Heusler alloys: A search for the forgotten Neel's L -type ferrimagnet

    Gerhard H. Fecher, Shogo Yamashita, Esita Pandey, Atsufumi Hirohata, Claudia Felser

    Physical Review Materials　2026/03/03

    DOI： 10.1103/l913-4x5y 　

  2. Machine learning for the development of new materials for a magnetic tunnel junction

    Atsufumi Hirohata, Hiroki Koizumi, Tufan Roy, Masahito Tsujikawa, Shigemi Mizukami, Kenji Nawa, Masafumi Shirai

    npj Spintronics　3　(1)　2025/07/30

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1038/s44306-025-00094-z 　

    eISSN： 2948-2119

    More details Close

    Abstract In materials science, we have been increasing the number of constituent elements in an alloy and compounds to improve their properties. For example, in magnetism and spintronics, ternary alloys, such as NdFeB and CoFeB have been developed and widely used in permanent magnets and memories/sensors, respectively. It has now been considered to be a time to add more elements to further explore their horizon. For such a complicated development, a manual systematic study is no longer practical, leading to the utilisation of machine learning to predict a candidate. These candidates can then be additionally screened by ab initio calculations before experimental confirmation, which can be performed routinely. Additional use of quantum annealing may also broaden the adoptability of machine learning on the materials development. In this perspective, we plan to offer a standardised process for such a development with some requirements for improvement.

  3. Characteristic frequencies in magnetic and spintronic phenomena

    Atsufumi Hirohata, Hiroki Koizumi, Daigo Oue, Mamoru Matsuo

    Newton　100192-100192　2025/07

    Publisher: Elsevier BV

    DOI： 10.1016/j.newton.2025.100192 　

    ISSN： 2950-6360

  4. Magnetics for Future Transportation: From Memory to Motors

    Meng-Huang Lai, Andrew Knight, Laura H. Lewis, Noureddine Takorabet, Atsufumi Hirohata, Min-Fu Hsieh

    IEEE Magnetics Letters　2025

    DOI： 10.1109/LMAG.2025.3643306 　

  5. Current-induced crystallisation in a Heusler-alloy-based giant magnetoresistive junction for neuromorphic potentiation

    Zhenyu Zhou, William Frost, David C. Lloyd, Takeshi Seki, Takahide Kubota, Rafael Ramos, Eiji Saitoh, Koki Takanashi, Atsufumi Hirohata

    Journal of Magnetism and Magnetic Materials　571　170575-170575　2023/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jmmm.2023.170575 　

    ISSN： 0304-8853

  6. Half-Metallic Bandgap Measurement Using Circularly Polarized Infrared Light

    Tariq F. Alhuwaymel, Takahide Kubota, Jun-Young Kim, Koki Takanashi, Atsufumi Hirohata

    SPIN　2023/03

    DOI： 10.1142/S2010324723500078 　

  7. Materials Informatics for the Development and Discovery of Future Magnetic Materials

    Ryotaro Okabe, Mingda Li, Yuma Iwasaki, Nicolas Regnault, Claudia Felser, Masafumi Shirai, Alexander Kovacs, Thomas Schrefl, Atsufumi Hirohata

    IEEE Magnetics Letters　14　1-5　2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/lmag.2023.3320888 　

    ISSN： 1949-307X

    eISSN： 1949-3088

  8. Antiferromagnetic Films and Their Applications

    Atsufumi Hirohata, David C. Lloyd, Takahide Kubota, Takeshi Seki, Koki Takanashi, Hiroaki Sukegawa, Zhenchao Wen, Seiji Mitani, Hiroki Koizumi

    IEEE Access　11　1-1　2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2023.3326448 　

    eISSN： 2169-3536

  9. MRAM makes its mark

    Atsufumi Hirohata

    NATURE ELECTRONICS　5　(12)　832-833　2022/12

    DOI： 10.1038/s41928-022-00893-w 　

    ISSN： 2520-1131

  10. Interfacial quality to control tunnelling magnetoresistance

    Atsufumi Hirohata, Kelvin Elphick, David C. Lloyd, Shigemi Mizukami

    Frontiers in Physics　10　2022/10/04

    DOI： 10.3389/fphy.2022.1007989 　

    ISSN： 2296-424X

    eISSN： 2296-424X

  11. Development of an optically gated Fe/n-GaAs spin-polarized transistor

    J. Y. Kim, M. Samiepour, E. Jackson, J. Ryu, D. Iizasa, T. Saito, M. Kohda, J. Nitta, H. E. Beere, D. A. Ritchie, A. Hirohata

    Physical Review B　106　(13)　2022/10/01

    DOI： 10.1103/PhysRevB.106.134404 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  12. Heusler alloys for metal spintronics

    Atsufumi Hirohata, David C. Lloyd

    MRS Bulletin　47　(6)　593-599　2022/06

    DOI： 10.1557/s43577-022-00350-1 　

    ISSN： 0883-7694

    eISSN： 1938-1425

  13. Control of perpendicular magnetic anisotropy at the Fe/MgO interface by phthalocyanine insertion

    Shoya Sakamoto, Edward Jackson, Takeshi Kawabe, Takuya Tsukahara, Yoshinori Kotani, Kentaro Toyoki, Emi Minamitani, Yoshio Miura, Tetsuya Nakamura, Atsufumi Hirohata, Shinji Miwa

    Physical Review B　105　(18)　2022/05/13

    DOI： 10.1103/physrevb.105.184414 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  14. Perpendicular Anisotropy Controlled by Seed and Capping Layers of Heusler-Alloy Films

    William Frost, Marjan Samiepour, Atsufumi Hirohata

    IEEE Transactions on Electron Devices　69　(4)　1629-1633　2022/04

    DOI： 10.1109/TED.2021.3105490 　

    ISSN： 0018-9383

    eISSN： 1557-9646

  15. Advances in Antiferromagnetic Spintronics

    Atsufumi Hirohata

    Magnetochemistry　8　(4)　37-37　2022/03/28

    DOI： 10.3390/magnetochemistry8040037 　

    eISSN： 2312-7481

  16. The role of industrial actors in the circular economy for critical raw materials: a framework with case studies across a range of industries

    Alexander Cimprich, Steven B. Young, Dieuwertje Schrijvers, Anthony Y. Ku, Christian Hagelüken, Patrice Christmann, Roderick Eggert, Komal Habib, Atsufumi Hirohata, Alan J. Hurd, Min-Ha Lee, David Peck, Evi Petavratzi, Luis A. Tercero Espinoza, Patrick Wäger, Alessandra Hool

    Mineral Economics　2022/02/21

    DOI： 10.1007/s13563-022-00304-8 　

    ISSN： 2191-2203

    eISSN： 2191-2211

  17. Global snapshot of the effects of the COVID-19 pandemic on the research activities of materials scientists between Spring and Autumn 2020 International-journal

    Adarsh Sandhu, Roland Hany, Atsufumi Hirohata, Shunichi Hishita, Ken Kimlicka, Masanobu Naito, Chikashi Nishimura

    Science and Technology of Advanced Materials　22　(1)　173-184　2021/12/31

    DOI： 10.1080/14686996.2021.1894756 　

    ISSN： 1468-6996

    eISSN： 1878-5514

  18. Heusler alloys for spintronic devices: review on recent development and future perspectives

    Kelvin Elphick, William Frost, Marjan Samiepour, Takahide Kubota, Koki Takanashi, Hiroaki Sukegawa, Seiji Mitani, Atsufumi Hirohata

    Science and Technology of Advanced Materials　22　(1)　235-271　2021/12/31

    DOI： 10.1080/14686996.2020.1812364 　

    ISSN： 1468-6996

    eISSN： 1878-5514

  19. Lattice Softening in Metastable bcc CoxMn100−x (001) Ferromagnetic Layers for a Strain-Free Magnetic Tunnel Junction

    Kevin Elphick, Kenta Yoshida, Tufan Roy, Tomohiro Ichinose, Kazuma Kunimatsu, Tomoki Tsuchiya, Kazuya Z. Suzuki, Masahito Tsujikawa, Yasuyoshi Nagai, Shigemi Mizukami, Masafumi Shirai, Atsufumi Hirohata

    Physical Review Applied　16　(5)　2021/11/30

    DOI： 10.1103/physrevapplied.16.054052 　

    ISSN： 2331-7019

    eISSN： 2331-7019

  20. Growth and Characterisation of Antiferromagnetic Ni2MnAl Heusler Alloy Films

    Teodor Huminiuc, Oliver Whear, Andrew J. Vick, David C. Lloyd, Gonzalo Vallejo-Fernandez, Kevin O’Grady, Atsufumi Hirohata

    Magnetochemistry　7　(9)　127-127　2021/09/13

    DOI： 10.3390/magnetochemistry7090127 　

    eISSN： 2312-7481

  21. Resolution of non-destructive imaging by controlled acceleration voltage in scanning electron microscopy

    Kelvin Elphick, Bernardus D. Aditya, Jiaqi Wu, Michihiro Ohta, Atsufumi Hirohata

    ULTRAMICROSCOPY　228　2021/09

    DOI： 10.1016/j.ultramic.2021.113316 　

    ISSN： 0304-3991

    eISSN： 1879-2723

  22. Current-induced crystallisation in Heusler alloy films for memory potentiation in neuromorphic computation

    William Frost, Kelvin Elphick, Marjan Samiepour, Atsufumi Hirohata

    SCIENTIFIC REPORTS　11　(1)　2021/08

    DOI： 10.1038/s41598-021-96706-9 　

    ISSN： 2045-2322

  23. Magnetic braille using ferrofluids

    A M Fletcher, J S P Downs, W Frost, D Clarke, K O’Grady, A Hirohata

    Journal of Physics D: Applied Physics　54　(21)　215001-215001　2021/05/27

    Publisher: {IOP} Publishing

    DOI： 10.1088/1361-6463/abe820 　

  24. Revealing the importance of interfaces for pure spin current transport

    A. Pfeiffer, R. M. Reeve, K. Elphick, A. Hirohata, M. Kläui

    Physical Review Research　2021/05/10

    DOI： 10.1103/PhysRevResearch.3.023110 　

  25. Evaluation of edge domains in giant magnetoresistive junctions

    William Frost, Takeshi Seki, Takahide Kubota, Rafael Ramos, Eiji Saitoh, Koki Takanashi, Atsufumi Hirohata

    Applied Physics Letters　118　(17)　172405-172405　2021/04/26

    DOI： 10.1063/5.0049315 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  26. Discrimination of skyrmion chirality via spin-orbit and -transfer torques for logic operation

    Yoshinobu Nakatani, Keisuke Yamada, Atsufumi Hirohata

    SCIENTIFIC REPORTS　11　(1)　2021/04

    DOI： 10.1038/s41598-021-87742-6 　

    ISSN： 2045-2322

  27. Non-Destructive Imaging on Synthesised Nanoparticles

    Kelvin Elphick, Akinobu Yamaguchi, Akira Otsuki, Neil Hayagan, Atsufumi Hirohata

    Materials　14　(3)　613-613　2021/01

    DOI： 10.3390/ma14030613 　

    eISSN： 1996-1944

  28. Review on spintronics: Principles and device applications

    Hirohata, A., Yamada, K., Nakatani, Y., Prejbeanu, L., Diény, B., Pirro, P., Hillebrands, B.

    Journal of Magnetism and Magnetic Materials　509　2020

    DOI： 10.1016/j.jmmm.2020.166711 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  29. A review of methods and data to determine raw material criticality

    Schrijvers, D., Hool, A., Blengini, G.A., Chen, W.-Q., Dewulf, J., Eggert, R., van Ellen, L., Gauss, R., Goddin, J., Habib, K., Hagelüken, C., Hirohata, A., Hofmann-Amtenbrink, M., Kosmol, J., Le Gleuher, M., Grohol, M., Ku, A., Lee, M.-H., Liu, G., Nansai, K., Nuss, P., Peck, D., Reller, A., Sonnemann, G., Tercero, L., Thorenz, A., Wäger, P.A.

    Resources, Conservation and Recycling　155　2020

    DOI： 10.1016/j.resconrec.2019.104617 　

    ISSN： 1879-0658 0921-3449

    eISSN： 1879-0658

  30. Opportunities and challenges for spintronics in the microelectronics industry

    Dieny, B., Prejbeanu, I.L., Garello, K., Gambardella, P., Freitas, P., Lehndorff, R., Raberg, W., Ebels, U., Demokritov, S.O., Akerman, J., Deac, A., Pirro, P., Adelmann, C., Anane, A., Chumak, A.V., Hirohata, A., Mangin, S., Valenzuela, S.O., Onbaşlı, M.C., d’Aquino, M., Prenat, G., Finocchio, G., Lopez-Diaz, L., Chantrell, R., Chubykalo-Fesenko, O., Bortolotti, P.

    Nature Electronics　3　(8)　2020

    DOI： 10.1038/s41928-020-0461-5 　

    ISSN： 2520-1131

  31. Anisotropy in antiferromagnets

    O'Grady, K., Sinclair, J., Elphick, K., Carpenter, R., Vallejo-Fernandez, G., Probert, M.I.J., Hirohata, A.

    Journal of Applied Physics　128　(4)　2020

    DOI： 10.1063/5.0006077 　

    ISSN： 1089-7550 0021-8979

  32. The 2020 magnetism roadmap

    Vedmedenko, E.Y., Kawakami, R.K., Sheka, D.D., Gambardella, P., Kirilyuk, A., Hirohata, A., Binek, C., Chubykalo-Fesenko, O., Sanvito, S., Kirby, B.J., Grollier, J., Everschor-Sitte, K., Kampfrath, T., You, C.-Y., Berger, A.

    Journal of Physics D: Applied Physics　53　(45)　453001-453001　2020

    Publisher: {IOP} Publishing

    DOI： 10.1088/1361-6463/ab9d98 　

    ISSN： 1361-6463 0022-3727

  33. Magnetic tunnel junctions with metastable bcc Co<inf>3</inf>Mn electrodes Peer-reviewed

    Kunimatsu, K., Tsuchiya, T., Roy, T., Elphick, K., Ichinose, T., Tsujikawa, M., Hirohata, A., Shirai, M., Mizukami, S.

    Applied Physics Express　13　(8)　2020

    DOI： 10.35848/1882-0786/aba883 　

    ISSN： 1882-0786 1882-0778

    eISSN： 1882-0786

  34. Experimental inspection of a computationally-designed NiCrMnSi Heusler alloy with high Curie temperature Peer-reviewed

    Onodera, Y., Elphick, K., Kanemura, T., Roy, T., Tsuchiya, T., Tsujikawa, M., Yoshida, K., Nagai, Y., Mizukami, S., Hirohata, A., Shirai, M.

    Japanese Journal of Applied Physics　59　(7)　073003-073003　2020

    Publisher: {IOP} Publishing

    DOI： 10.35848/1347-4065/ab9c75 　

    ISSN： 1347-4065 0021-4922

    eISSN： 1347-4065

  35. Non-destructive imaging for quality assurance of magnetoresistive random-access memory junctions Peer-reviewed

    Jackson, E., Wu, Y., Frost, W., Kim, J.-Y., Samiepour, M., Elphick, K., Sun, M., Kubota, T., Takanashi, K., Ichinose, T., Mizukami, S., Hirohata, A.

    Journal of Physics D: Applied Physics　53　(1)　014004-1-014004-11　2020

    Publisher: {IOP} Publishing

    DOI： 10.1088/1361-6463/ab47b6 　

    ISSN： 1361-6463 0022-3727

  36. Tunnel Magnetoresistance in the Magnetic Tunnel Junctions with an Amorphous Boron Nitride Barrier Formed via Nitrogen Diffusion Peer-reviewed

    T. Ichinose, K. Elphick, A. Hirohata, S. Mizukami

    ACS Applied Electronic Materials　1　(11)　2220-2225　2019/10

    DOI： 10.1021/acsaelm.9b00431 　

    ISSN： 2637-6113

  37. Magnetic force microscopy for magnetic recording and devices

    Hirohata, A., Samiepour, M., Corbetta, M.

    NanoScience and Technology　2019

    DOI： 10.1007/978-3-030-15612-1_8 　

    ISSN： 2197-7127 1434-4904

  38. Low-temperature crystallisation of Heusler alloy films with perpendicular magnetic anisotropy

    Frost, W., Samiepour, M., Hirohata, A.

    Journal of Magnetism and Magnetic Materials　484　100-104　2019

    DOI： 10.1016/j.jmmm.2019.04.008 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  39. Thermal stability of exchange bias systems based on MnN

    Sinclair, J., Hirohata, A., Vallejo-Fernandez, G., Meinert, M., O'Grady, K.

    Journal of Magnetism and Magnetic Materials　476　2019

    DOI： 10.1016/j.jmmm.2018.12.018 　

    ISSN： 0304-8853

  40. Switching of Skyrmion chirality by local heating

    Nakatani, Y., Yamada, K., Hirohata, A.

    Scientific Reports　9　(1)　2019

    DOI： 10.1038/s41598-019-49875-7 　

    ISSN： 2045-2322

    eISSN： 2045-2322

  41. Controllability of cupric particle synthesis by linear alcohol chain number as additive and pH control in cupric acetate solution using X-ray radiolysis Peer-reviewed

    Yamaguchi, A., Okada, I., Sakurai, I., Izumi, H., Ishihara, M., Fukuoka, T., Suzuki, S., Elphick, K., Jackson, E., Hirohata, A., Utsumi, Y.

    Journal of Synchrotron Radiation　26　1986-1995　2019

    DOI： 10.1107/S1600577519010543 　

    ISSN： 1600-5775 0909-0495

    eISSN： 1600-5775

  42. In-plane and perpendicular exchange bias effect induced by an antiferromagnetic D0 <inf>19</inf> Mn <inf>2</inf> FeGa thin film Peer-reviewed

    Ogasawara, T., Jackson, E., Tsunoda, M., Ando, Y., Hirohata, A.

    Journal of Magnetism and Magnetic Materials　484　307-312　2019

    DOI： 10.1016/j.jmmm.2019.04.024 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  43. Structural and antiferromagnetic characterization of noncollinear D0<inf>19</inf> Mn<inf>3</inf>Ge polycrystalline film Peer-reviewed

    Ogasawara, T., Kim, J.-Y., Ando, Y., Hirohata, A.

    Journal of Magnetism and Magnetic Materials　473　7-11　2019

    DOI： 10.1016/j.jmmm.2018.10.035 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  44. Magnetic tunnel junctions with a B2-ordered CoFeCrAl equiatomic Heusler alloy Peer-reviewed

    Tsuchiya, T., Roy, T., Elphick, K., Okabayashi, J., Bainsla, L., Ichinose, T., Suzuki, K.Z., Tsujikawa, M., Shirai, M., Hirohata, A., Mizukami, S.

    Physical Review Materials　3　(8)　084403　2019

    DOI： 10.1103/PhysRevMaterials.3.084403 　

    ISSN： 2475-9953

  45. Fabrication of magnetic tunnel junctions with a metastable bcc Co<inf>3</inf>Mn disordered alloy as a bottom electrode Peer-reviewed

    Kunimatsu, K., Tsuchiya, T., Elphick, K., Ichinose, T., Suzuki, K.Z., Hirohata, A., Mizukami, S.

    Japanese Journal of Applied Physics　58　(8)　080908(R)　2019

    DOI： 10.7567/1347-4065/ab2f96 　

    ISSN： 1347-4065 0021-4922

    eISSN： 1347-4065

  46. Spin Current

    Atsufumi Hirohata

    FRONTIERS IN PHYSICS　6　2018/03

    DOI： 10.3389/fphy.2018.00023 　

    ISSN： 2296-424X

  47. Heusler alloys with bcc tungsten seed layers for GMR junctions

    Frost, W., Hirohata, A.

    Journal of Magnetism and Magnetic Materials　453　182-185　2018

    DOI： 10.1016/j.jmmm.2018.01.015 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  48. Growth and characterisation of ferromagnetic and antiferromagnetic Fe<inf>2+x</inf>V<inf>y</inf>Al Heusler alloy films Peer-reviewed

    Huminiuc, T., Whear, O., Takahashi, T., Kim, J.-Y., Vick, A., Vallejo-Fernandez, G., O'Grady, K., Hirohata, A.

    Journal of Physics D: Applied Physics　51　(32)　2018

    DOI： 10.1088/1361-6463/aacf4c 　

    ISSN： 1361-6463 0022-3727

    eISSN： 1361-6463

  49. Chemical and structural analysis on magnetic tunnel junctions using a decelerated scanning electron beam /639/301/1005/1007 /639/301/930/2735 /120 article Peer-reviewed

    Jackson, E., Sun, M., Kubota, T., Takanashi, K., Hirohata, A.

    Scientific Reports　8　(1)　2018

    DOI： 10.1038/s41598-018-25638-8 　

    ISSN： 2045-2322

  50. Large exchange bias induced by polycrystalline Mn<inf>3</inf>Ga antiferromagnetic films with controlled layer thickness Peer-reviewed

    Wu, H., Sudoh, I., Xu, R., Si, W., Vaz, C.A.F., Kim, J.-Y., Vallejo-Fernandez, G., Hirohata, A.

    Journal of Physics D: Applied Physics　51　(21)　2018

    DOI： 10.1088/1361-6463/aabd8e 　

    ISSN： 1361-6463 0022-3727

    eISSN： 1361-6463

  51. Magneto-optical detection of spin accumulation under the influence of mechanical rotation Peer-reviewed

    Hirohata, A., Baba, Y., Murphy, B.A., Ng, B., Yao, Y., Nagao, K., Kim, J.-Y.

    Scientific Reports　8　(1)　2018

    DOI： 10.1038/s41598-018-20269-5 　

    ISSN： 2045-2322

  52. Perpendicular magnetic anisotropy in Heusler alloy films and their magnetoresistive junctions Peer-reviewed

    Hirohata, A., Frost, W., Samiepour, M., Kim, J.-Y.

    Materials　11　(1)　2018

    DOI： 10.3390/ma11010105 　

    ISSN： 1996-1944

    eISSN： 1996-1944

  53. Fabrication of Epitaxial Fe3O4 Film on a Si(111) Substrate Peer-reviewed

    Nozomi Takahashi, Teodor Huminiuc, Yuta Yamamoto, Takashi Yanase, Toshihiro Shimada, Atsufumi Hirohata, Taro Nagahama

    Scientific Reports　7　(1)　2017/12

    DOI： 10.1038/s41598-017-07104-z 　

    ISSN： 2045-2322

  54. Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material Peer-reviewed

    Atsufumi Hirohata, Teodor Huminiuc, John Sinclair, Haokaifeng Wu, Marjan Samiepour, Gonzalo Vallejo-Fernandez, Kevin O’Grady, Jan Balluf, Markus Meinert, Günter Reiss, Eszter Simon, Sergii Khmelevskyi, Laszlo Szunyogh, Rocio Yanes Díaz, Ulrich Nowak, Tomoki Tsuchiya, Tomoko Sugiyama, Takahide Kubota, Koki Takanashi, Nobuhito Inami, Kanta Ono

    Journal of Physics D: Applied Physics　50　(43)　2017/11/08

    DOI： 10.1088/1361-6463/aa88f4 　

    ISSN： 0022-3727

  55. Development of antiferromagnetic Heusler alloys for the replacement of iridium as a critically raw material Peer-reviewed

    Atsufumi Hirohata, Teodor Huminiuc, John Sinclair, Haokaifeng Wu, Marjan Samiepour, Gonzalo Vallejo-Fernandez, Kevin O'Grady, Jan Balluf, Markus Meinert, Gunter Reiss, Eszter Simon, Sergii Khmelevskyi, Laszlo Szunyogh, Rocio Yanes Diaz, Ulrich Nowak, Tomoki Tsuchiya, Tomoko Sugiyama, Takahide Kubota, Koki Takanashi, Nobuhito Inami, Kanta Ono

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　50　(44)　2017/11

    DOI： 10.1088/1361-6463/aa88f4 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  56. Magnetic and structural properties of antiferromagnetic Mn2VSi alloy films grown at elevated temperatures Peer-reviewed

    Haokaifeng Wu, Gonzalo Vallejo-Fernandez, Atsufumi Hirohata

    Journal of Physics D: Applied Physics　50　(37)　2017/09/20

    DOI： 10.1088/1361-6463/aa80d5 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  57. Integration of antiferromagnetic Heusler compound Ru2MnGe into spintronic devices Peer-reviewed

    Jan Balluff, Teodor Huminiuc, Markus Meinert, Atsufumi Hirohata, Guenter Reiss

    APPLIED PHYSICS LETTERS　111　(3)　2017/07

    DOI： 10.1063/1.4985179 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  58. Exchange bias induced at a Co2FeAl0.5Si0.5/Cr interface Peer-reviewed

    C. N. T. Yu, A. J. Vick, N. Inami, K. Ono, W. Frost, A. Hirohata

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　50　(12)　125004　2017/02

    DOI： 10.1088/1361-6463/aa560d 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  59. Optically induced and detected spin current

    Hirohata, A., Kim, J.-Y.

    Spin Current　2017

    DOI： 10.1093/oso/9780198787075.003.0006 　

  60. Non-destructive imaging of buried electronic interfaces using a decelerated scanning electron beam Peer-reviewed

    Atsufumi Hirohata, Yasuaki Yamamoto, Benedict A. Murphy, Andrew J. Vick

    Nature Communications　7　(1)　12701　2016/11/02

    DOI： 10.1038/ncomms12701 　

    ISSN： 2041-1723

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

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

    APPLIED PHYSICS LETTERS　109　(22)　2016/11

    DOI： 10.1063/1.4971281 　

    ISSN： 0003-6951

    eISSN： 1077-3118

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

    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　6　2016/11

    DOI： 10.1038/srep37282 　

    ISSN： 2045-2322

  63. Highly Efficient Spin-Current Operation in a Cu Nano-Ring Peer-reviewed

    Benedict A. Murphy, Andrew J. Vick, Marjan Samiepour, Atsufumi Hirohata

    SCIENTIFIC REPORTS　6　2016/11

    DOI： 10.1038/srep37398 　

    ISSN： 2045-2322

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

    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　28　(39)　2016/10

    DOI： 10.1088/0953-8984/28/39/395003 　

    ISSN： 0953-8984

    eISSN： 1361-648X

  65. Perpendicular Anisotropy in Heusler Alloy Layers Induced by a V Seed Layer Peer-reviewed

    W. Frost, A. Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　52　(7)　2016/07

    DOI： 10.1109/TMAG.2016.2517738 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  66. Exchange bias effects in Heusler alloy Ni2MnAl/Fe bilayers Peer-reviewed

    Tomoki Tsuchiya, Takahide Kubota, Tomoko Sugiyama, Teodor Huminiuc, Atsufumi Hirohata, Koki Takanashi

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　49　(23)　2016/06

    DOI： 10.1088/0022-3727/49/23/235001 　

    ISSN： 0022-3727

    eISSN： 1361-6463

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

    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　108　(17)　2016/04

    DOI： 10.1063/1.4948466 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  68. Exchange bias of polycrystalline Heusler alloy thin films

    Endo, H., Nakayama, T., Sagar, J., Fernandez, G.V., Hirohata, A., O’Grady, K.

    Springer Series in Materials Science　222　2016

    DOI： 10.1007/978-3-319-21449-8_19 　

    ISSN： 0933-033X

  69. Heusler Alloy films for spintronic devices Peer-reviewed

    Atsufumi Hirohata, James Sagar, Luke R. Fleet, Stuart S.P. Parkin

    Springer Series in Materials Science　222　219-248　2016/01/01

    Publisher: Springer Verlag

    DOI： 10.1007/978-3-319-21449-8_9 　

    ISSN： 0933-033X

  70. The effect of atomic structure on interface spin-polarization of half-metallic spin valves: Co2MnSi/Ag epitaxial interfaces Peer-reviewed

    Zlatko Nedelkoski, Philip J. Hasnip, Ana M. Sanchez, Balati Kuerbanjiang, Edward Higgins, Mikihiko Oogane, Atsufumi Hirohata, Gavin R. Bell, Vlado K. Lazarov

    APPLIED PHYSICS LETTERS　107　(21)　2015/11

    DOI： 10.1063/1.4936630 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  71. Roadmap for Emerging Materials for Spintronic Device Applications Peer-reviewed

    Atsufumi Hirohata

    IEEE Transactions on Magnetics　51　(10)　2015/10

    DOI： 10.1109/TMAG.2015.2457393 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  72. Direct band-gap measurement on epitaxial Co2FeAl0.5Si0.5 Heusler-alloy films Peer-reviewed

    Tariq F. Alhuwaymel, Robert Carpenter, Chris Nga Tung Yu, Balati Kuerbanjiang, Ranjdar M. Abdullah, Vlado K. Lazarov, Mohamed El-Gomati, Atsufumi Hirohata

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4916817 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  73. Optimisation of geometrical ratchets for spin-current amplification Peer-reviewed

    Ranjdar M. Abdullah, Andrew J. Vick, Benedict A. Murphy, Atsufumi Hirohata

    JOURNAL OF APPLIED PHYSICS　117　(17)　2015/05

    DOI： 10.1063/1.4916764 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  74. Dependence of Curie temperature on Pt layer thickness in Co/Pt system Peer-reviewed

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

    APPLIED PHYSICS LETTERS　106　(13)　2015/03

    DOI： 10.1063/1.4916824 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  75. POLYCRYSTALLINE CO-BASED FULL-HEUSLER-ALLOY FILMS FOR SPINTRONIC DEVICES Peer-reviewed

    A. Hirohata, J. Sagar, L. R. Fleet, H. Endo

    SPIN　4　(4)　2014/12

    DOI： 10.1142/S2010324714400219 　

    ISSN： 2010-3247

    eISSN： 2010-3255

  76. Spin-current signal amplification by a geometrical ratchet Peer-reviewed

    Ranjdar M. Abdullah, Andrew J. Vick, Benedict A. Murphy, Atsufumi Hirohata

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　47　(48)　2014/12

    DOI： 10.1088/0022-3727/47/48/482001 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  77. FOREWORD - HEUSLER-ALLOY FILMS AND DEVICES Peer-reviewed

    Claudia Felser, Atsufumi Hirohata

    SPIN　4　(4)　2014/12

    DOI： 10.1142/S2010324714020032 　

    ISSN： 2010-3247

    eISSN： 2010-3255

  78. New Bandgap Measurement Technique for a Half-Metallic Ferromagnet Peer-reviewed

    Tariq F. Alhuwaymel, Ranjdar M. Abdullah, Oliver Whear, Teodor Huminiuc, Robert Carpenter, Mohamed El-Gomati, Atsufumi Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　50　(11)　2014/11

    DOI： 10.1109/TMAG.2014.2322912 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  79. Domain wall pinning for racetrack memory using exchange bias Peer-reviewed

    I. Polenciuc, A. J. Vick, D. A. Allwood, T. J. Hayward, G. Vallejo-Fernandez, K. O'Grady, A. Hirohata

    APPLIED PHYSICS LETTERS　105　(16)　2014/10

    DOI： 10.1063/1.4899134 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  80. Growth of polycrystalline Heusler alloys for spintronic devices Peer-reviewed

    J. Sagar, C. N. T. Yu, L. Lari, A. Hirohata

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　47　(26)　2014/07

    DOI： 10.1088/0022-3727/47/26/265002 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  81. Over 50% reduction in the formation energy of Co-based Heusler alloy films by two-dimensional crystallisation Peer-reviewed

    James Sagar, Luke R. Fleet, Michael Walsh, Leonardo Lari, Edward D. Boyes, Oliver Whear, Teodor Huminiuc, Andrew Vick, Atsufumi Hirohata

    APPLIED PHYSICS LETTERS　105　(3)　2014/07

    DOI： 10.1063/1.4886769 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  82. Investigation of the temperature-dependence of ferromagnetic resonance and spin waves in Co2FeAl0.5Si0.5 Peer-reviewed

    Li Ming Loong, Jae Hyun Kwon, Praveen Deorani, Chris Nga Tung Yu, Atsufumi Hirohata, Hyunsoo Yang

    APPLIED PHYSICS LETTERS　104　(23)　2014/06

    DOI： 10.1063/1.4883495 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  83. Effect of grain cutting in exchange biased nanostructures Peer-reviewed

    R. Carpenter, A. J. Vick, A. Hirohata, G. Vallejo-Fernandez, K. O'Grady

    JOURNAL OF APPLIED PHYSICS　115　(17)　2014/05

    DOI： 10.1063/1.4868328 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  84. Future perspectives for spintronic devices Peer-reviewed

    Atsufumi Hirohata, Koki Takanashi

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　47　(19)　2014/05

    DOI： 10.1088/0022-3727/47/19/193001 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  85. Optimization of exchange bias in Co2FeAl0.5Si0.5 Heusler alloy layers Peer-reviewed

    Atsufumi Hirohata, Keisuke Izumida, Satoshi Ishizawa, James Sagar, Tadachika Nakayama

    JOURNAL OF APPLIED PHYSICS　115　(17)　2014/05

    DOI： 10.1063/1.4868601 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  86. B2 Atomic Disorder in Co2FexMn1-xSi Heusler Alloys Peer-reviewed

    P.J. Hasnip, C. H. Loach, J. H. Smith, M. I. J. Probert, D. Gilks, J. Sizeland, K. Yoshida, M. Oogane, A. Hirohata, V. K. Lazarov

    Journal of the Magnetics Society of Japan　38　50-55　2014/03/20

    DOI： 10.3379/msjmag.1402R010 　

  87. The Effect of Cobalt-Sublattice Disorder on Spin Polarisation in Co2FexMn1-xSi Heusler Alloys Peer-reviewed

    Philip J. Hasnip, Christian H. Loach, Joseph H. Smith, Matthew I. J. Probert, Daniel Gilks, James Sizeland, Leonardo Lari, James Sagar, Kenta Yoshida, Mikihiko Oogane, Atsufumi Hirohata, Vlado K. Lazarov

    MATERIALS　7　(3)　1473-1482　2014/03

    DOI： 10.3390/ma7031473 　

    ISSN： 1996-1944

    eISSN： 1996-1944

  88. Spin-Polarised Electron Transport across an Abrupt or Partially Intermixed Fe/GaAs(001) Interface Peer-reviewed

    A. Hirohata, L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Kaneko, Y. Ohno, S Honda, J. Inoue, H. Ohno

    Journal of the Magnetics Society of Japan　38　66-70　2014/02/19

    DOI： 10.3379/msjmag.1402R006 　

  89. Correlations between atomic structure and giant magnetoresistance ratio in Co-2(Fe,Mn) Si spin valves Peer-reviewed

    L. Lari, K. Yoshida, P.L. Galindo, J. Sato, J. Sizeland, D. Gilks, G.M, Uddin, Z. Nedelkoski, P.J, Hasnip, A. Hirohata, M. Oogane, Y. Ando, V.K. Lazarov

    Journal of Physics D- Applied Physics　47　(32)　322003-1-322003-5　2014

    DOI： 10.1088/0022-3727/47/32/322003 　

    ISSN： 1361-6463 0022-3727

  90. Heusler-alloy films for spintronic devices Peer-reviewed

    Atsufumi Hirohata, James Sagar, Leonardo Lari, Luke R. Fleet, Vlado K. Lazarov

    APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING　111　(2)　423-430　2013/05

    DOI： 10.1007/s00339-013-7679-2 　

    ISSN： 0947-8396

    eISSN： 1432-0630

  91. Uniaxial anisotropy of two-magnon scattering in an ultrathin epitaxial Fe layer on GaAs Peer-reviewed

    H. Kurebayashi, T. D. Skinner, K. Khazen, K. Olejnik, D. Fang, C. Ciccarelli, R. P. Campion, B. L. Gallagher, L. Fleet, A. Hirohata, A. J. Ferguson

    APPLIED PHYSICS LETTERS　102　(6)　2013/02

    DOI： 10.1063/1.4792269 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  92. Physical Review B Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayaashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, A. Hirohata

    Correlating the interface structure to spin injection in abrupt Fe/GaAs(001)films　87　024401(1)-024401(5)　2013/01/02

  93. Correlating the interface structure to spin injection in abrupt Fe/GaAs(001)films Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayaashi, Y. Kaneko, S. Matsuzaka, Y. Ohno, H. Ohno, S. Honda, J. Inoue, A. Hirohata

    Physical Review B　87　(2)　024401(1)-024401(5)　2013/01/02

    DOI： 10.1103/PhysRevB.87.024401 　

    ISSN： 1098-0121 1550-235X

  94. Effect of Seed Layers on Polycrystalline Co2FeSi Thin Films Peer-reviewed

    J. Sagar, C. Yu, C. Pelter, J. Wood, L. Lari, A. Hirohata, K. O'Grady

    IEEE TRANSACTIONS ON MAGNETICS　48　(11)　4006-4009　2012/11

    DOI： 10.1109/TMAG.2012.2202890 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  95. Effect of Interface Structure on Exchange Biased Heusler Alloy Films Peer-reviewed

    H. Endo, A. Hirohata, J. Sagar, L. R. Fleet, T. Nakayama, K. O'Grady

    IEEE TRANSACTIONS ON MAGNETICS　48　(11)　2896-2898　2012/11

    DOI： 10.1109/TMAG.2012.2194479 　

    ISSN： 0018-9464

  96. Magnetic Properties of Epitaxial Co-Evaporated Fe:MgO Anti-Granular Films Peer-reviewed

    M. Rummey, L. R. Fleet, H. Hing, X. Zhang, A. Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　48　(11)　4010-4013　2012/11

    DOI： 10.1109/TMAG.2012.2198456 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  97. Room-temperature structural ordering of a Heusler-compound Fe3Si Peer-reviewed

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

    Phys. Rev. B　86　(17)　174406-1-174406-7　2012/11

    DOI： 10.1103/PhysRevB.86.174406 　

    ISSN： 1098-0121 1550-235X

  98. Growth and characterization of thin Cu-phthalocyanine films on MgO(001) layer for organic light-emitting diodes Peer-reviewed

    Yu Jeong Bae, Nyun Jong Lee, Tae Hee Kim, Hyunduck Cho, Changhee Lee, Luke Fleet, Atsufumi Hirohata

    NANOSCALE RESEARCH LETTERS　7　2012/11

    DOI： 10.1186/1556-276X-7-650 　

    ISSN： 1556-276X

    eISSN： 1556-276X

  99. The effect of interfaces on magnetic activation volumes in single crystal Co<inf>2</inf>FeSi Heusler alloy thin films

    J. Sagar, H. Sukegawa, L. Lari, L. Lari, V. K. Lazarov, S. Mitani, K. O'Grady, A. Hirohata, A. Hirohata

    Applied Physics Letters　101　(10)　2012/09/03

    DOI： 10.1063/1.4749822 　

    ISSN： 0003-6951

  100. Observation of Magnetic-Switching and Multiferroic-Like Behavior of Co Nanoparticles in a C60 Matrix Peer-reviewed

    Yutaka Sakai, Eiiti Tamura, Shuhei Toyokawa, Eiji Shikoh, Vlado K. Lazarov, Atsufumi Hirohata, Teruya Shinjo, Yoshishige Suzuki, Masashi Shiraishi

    ADVANCED FUNCTIONAL MATERIALS　22　(18)　3845-3852　2012/09

    DOI： 10.1002/adfm.201200638 　

    ISSN： 1616-301X

    eISSN： 1616-3028

  101. Layer-by-Layer crystallization of Co2FeSi Heusler Alloy Thin Films Peer-reviewed

    L.R. Fleet, G. Cheglakov, K. Yoshida, V.K. Lasarov, T. Nakayama, A. hirohata

    J. Phys. D: Appl. Phys.　45　(3)　032001-1-032001-4　2012/01/25

    Publisher:

    DOI： 10.1088/0022-3727/45/3/032001 　

    ISSN： 0022-3727 1361-6463

  102. Atomic Interfacial Structures in Fe/GaAs Films Peer-reviewed

    L. R. Fleet, H. Kobayashi, Y. Ohno, A. Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　47　(10)　2756-2759　2011/10

    DOI： 10.1109/TMAG.2011.2156388 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  103. Enhancement of Exchange Bias in the Co2FeSi/IrMn System Peer-reviewed

    N. P. Aley, S. Takayama, A. Hirohata, K. O&apos;Grady

    IEEE TRANSACTIONS ON MAGNETICS　47　(10)　3490-3493　2011/10

    DOI： 10.1109/TMAG.2011.2151838 　

    ISSN： 0018-9464

  104. Activation Volumes in Co2FeSi Thin Films Peer-reviewed

    J. Sagar, L. R. Fleet, A. Hirohata, K. O'Grady

    IEEE TRANSACTIONS ON MAGNETICS　47　(10)　2440-2443　2011/10

    DOI： 10.1109/TMAG.2011.2145367 　

    ISSN： 0018-9464

  105. Spin-transfer-torque-induced phenomena Peer-reviewed

    Atsufumi Hirohata

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　44　(38)　2011/09

    DOI： 10.1088/0022-3727/44/38/380301 　

    ISSN： 0022-3727

  106. Effect of grain size on exchange-biased Heusler alloys Peer-reviewed

    H. Endo, A. Hirohata, J. Sagar, L. R. Fleet, T. Nakayama, K. O&apos;Grady

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　44　(34)　2011/08

    DOI： 10.1088/0022-3727/44/34/345003 　

    ISSN： 0022-3727

  107. Optimization of exchange-biased Heusler alloys Peer-reviewed

    H. Endo, A. Hirohata, T. Nakayama, K. O&apos; Grady

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　44　(14)　145003-1-145003-4　2011/04

    DOI： 10.1088/0022-3727/44/14/145003 　

    ISSN： 0022-3727

  108. Interfacial structure and transport properties of Fe/GaAs(001) Peer-reviewed

    L. R. Fleet, H. Kobayashi, Y. Ohno, J. -Y. Kim, C. H. W. Barnes, A. Hirohata

    JOURNAL OF APPLIED PHYSICS　109　(7)　2011/04

    DOI： 10.1063/1.3554267 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  109. The effect of film and interface structure on the transport properties of Heusler based current-perpendicular-to-plane spin valves Peer-reviewed

    K. Yoshida, J. Sato, P. J. Hasnip, M. Oogane, A. Hirohata, Y. Ando

    Appl. Phys. Lett　98　(24)　242508-1-242508-3　2011

    DOI： 10.1063/1.3600792 　

    ISSN： 0003-6951

  110. Schottky Barrier Height in Fe/GaAs Films Peer-reviewed

    L. R. Fleet, K. Yoshida, H. Kobayashi, Y. Ohno, H. Kurebayashi, J. -Y. Kim, C. H. W. Barnes, A. Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　46　(6)　1737-1740　2010/06

    DOI： 10.1109/TMAG.2010.2045483 　

    ISSN： 0018-9464

  111. Interfacial structure and magnetic properties of Co2FeAl0.5Si0.5/MgO heterostructures Peer-reviewed

    Sameh S. A. Hassan, Yongbing Xu, Atsufumi Hirohata, Hiroaki Sukegawa, Wenhong Wang, Koichiro Inomata, Gerrit van der Laan

    JOURNAL OF APPLIED PHYSICS　107　(10)　2010/05

    DOI： 10.1063/1.3371694 　

    ISSN： 0021-8979

  112. Si segregation in polycrystalline Co2MnSi films with grain-size control Peer-reviewed

    A. Hirohata, S. Ladak, N. P. Aley, G. B. Hix

    APPLIED PHYSICS LETTERS　95　(25)　2009/12

    DOI： 10.1063/1.3276073 　

    ISSN： 0003-6951

  113. Current manipulation of a vortex confined in a micron-sized Fe19Ni81 disk Peer-reviewed

    Akinobu Yamaguchi, Keiichi Motoi, Hideki Miyajima, Atsufumi Hirohata, Takehiro Yamaoka, Tsuyoshi Uchiyama, Yuichi Utsumi

    APPLIED PHYSICS LETTERS　95　(12)　2009/09

    DOI： 10.1063/1.3236693 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  114. Observation of a bias-dependent constrained magnetic wall in a Ni point contact Peer-reviewed

    Koji Sekiguchi, Akinobu Yamaguchi, Hideki Miyajima, Atsufumi Hirohata, Shinji Usui

    PHYSICAL REVIEW B　78　(22)　2008/12

    DOI： 10.1103/PhysRevB.78.224418 　

    ISSN： 1098-0121

  115. A silicon metal-oxide-semiconductor field-effect transistor Hall bar for scanning Hall probe microscopy Peer-reviewed

    Akinobu Yamaguchi, Hiromasa Saito, Masayoshi Shimizu, Hideki Miyajima, Satoru Matsumoto, Yoshiharu Nakamura, Atsufumi Hirohata

    REVIEW OF SCIENTIFIC INSTRUMENTS　79　(8)　2008/08

    DOI： 10.1063/1.2968713 　

    ISSN： 0034-6748

  116. Effect of ferromagnetism on AB oscillations in a normal-metal ring Peer-reviewed

    Koji Sekiguchi, Akinobu Yamaguchi, Hideki Miyajima, Atsufumi Hirohata

    PHYSICAL REVIEW B　77　(14)　2008/04

    DOI： 10.1103/PhysRevB.77.140401 　

    ISSN： 1098-0121

  117. Vertical stack of Co nanorings with current-perpendicular-to-plane giant magnetoresistance: Experiment and micromagnetic simulation Peer-reviewed

    T. Yang, A. Hirohata, L. Vila, T. Kimura, Y. Otani

    PHYSICAL REVIEW B　76　(17)　2007/11

    DOI： 10.1103/PhysRevB.76.172401 　

    ISSN： 1098-0121

  118. Domain formation induced by perpendicular spin injection Peer-reviewed

    T. Yang, A. Hirohata, T. Kimura, Y. Otani

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　E690-E692　2007/03

    DOI： 10.1016/j.jmmm.2006.10.931 　

    ISSN： 0304-8853

  119. Current-induced vortex-vortex switching in a nanopillar comprising two Co nano-rings Peer-reviewed

    T. Yang, A. Hirohata, M. Hara, T. Kimura, Y. Otani

    APPLIED PHYSICS LETTERS　90　(9)　2007/02

    DOI： 10.1063/1.2710185 　

    ISSN： 0003-6951

  120. Manipulating spin current in the magnetic nanopillar

    Yang, T., Hirohata, A., Kimura, T., Otani, Y.

    Journal of Nanoscience and Nanotechnology　7　(1)　2007

    ISSN： 1533-4880

  121. Magnetic characterization and switching of Co nanorings in current-perpendicular-to-plane configuration Peer-reviewed

    T. Yang, M. Hara, A. Hirohata, T. Kimura, Y. Otani

    APPLIED PHYSICS LETTERS　90　(2)　2007/01

    DOI： 10.1063/1.2431471 　

    ISSN： 0003-6951

  122. Temperature dependence of intrinsic switching current of a Co nanomagnet Peer-reviewed

    T. Yang, A. Hirohata, M. Hara, T. Kimura, Y. Otani

    APPLIED PHYSICS LETTERS　89　(25)　2006/12

    DOI： 10.1063/1.2420789 　

    ISSN： 0003-6951

  123. Spin-transfer-induced magnetic domain formation Peer-reviewed

    T. Yang, A. Hirohata, T. Kimura, Y. Otani

    JOURNAL OF APPLIED PHYSICS　100　(7)　2006/10

    DOI： 10.1063/1.2357002 　

    ISSN： 0021-8979

  124. Estimation of local and nonlocal contributions to the current-induced magnetization switching Peer-reviewed

    T. Yang, A. Hirohata, T. Kimura, Y. Otani

    PHYSICAL REVIEW B　74　(15)　2006/10

    DOI： 10.1103/PhysRevB.74.153301 　

    ISSN： 1098-0121

  125. Structural and electrical properties of InSe polycrystalline films and diode fabrication Peer-reviewed

    A Hirohata, JS Moodera, GP Berera

    THIN SOLID FILMS　510　(1-2)　247-250　2006/07

    DOI： 10.1016/j.tsf.2005.12.202 　

    ISSN： 0040-6090

  126. Influence of capping layer on the current-induced magnetization switching in magnetic nanopillars Peer-reviewed

    T Yang, A Hirohata, T Kimura, Y Otani

    JOURNAL OF APPLIED PHYSICS　99　(7)　2006/04

    DOI： 10.1063/1.2189205 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  127. Electron spin filtering across a ferromagnetic metal/semiconductor interface measured by photoexcitation

    A. Hirohata, S. J. Steinmuller, J. A.C. Bland

    Spintronic Materials and Technology　305-336　2006/01/01

    Publisher: CRC Press

  128. Magnetic properties of epitaxial Co2Cr1-xFexAl full Heusler alloy thin films with the L2(1) structure Peer-reviewed

    A Hirohata, H Kurebayashi, S Okamura, N Tezuka, K Inomata

    IEEE TRANSACTIONS ON MAGNETICS　41　(10)　2802-2804　2005/10

    DOI： 10.1109/TMAG.2005.854831 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  129. Optical studies of electron spin transmission

    Bland, J.A.C., Steinm{\"u}ller, S.J., Hirohata, A., Taniyama, T.

    Ultrathin Magnetic Structures IV: Applications of Nanomagnetism　2005

    DOI： 10.1007/3-540-27164-3_4 　

  130. Magnetic properties of L21-structured Co2(Cr,Fe)Al films grown on GaAs(001) substrates Peer-reviewed

    A. Hirohata, H. Kurebayashi, S. Okamura, T. Masaki, T. Nozaki, M. Kikuchi, N. Tezuka, K. Inomata, J.S. Claydon, Y.B. Xu

    JOURNAL OF APPLIED PHYSICS　97　(10)　10C308-1-10C308-3　2005

    DOI： 10.1063/1.1854256 　

    ISSN： 0021-8979

  131. Distinctive current-induced magnetization switching in a current-perpendicular-to-plane giant-magnetoresistance nanopillar with a synthetic antiferromagnet free layer Peer-reviewed

    T. Ochiai, Y. Jiang, A. Hirohata, N. Tezuka, S. Sugimoto, K. Inomata

    APPLIED PHYSICS LETTERS　86　(24)　242506-1-242506-3　2005

    DOI： 10.1063/1.1949709 　

    ISSN： 0003-6951

  132. Magnetic Transport Mechanism in Double Ferromagnetic Tunnel Junctions With Two-Dimensional Ferromagnetic Particles Peer-reviewed

    Hiroaki Sukegawa, Atsufumi Hirohata, Shinich Nakamura, Nobuki Tezuka, Satoshi Sugimoto, Koichiro Inomata

    IEEE TRANSACTIONS ON MAGNETICS　41　(10)　2679-2681　2005

    DOI： 10.1109/TMAG.2005.855292 　

    ISSN： 0018-9464

  133. 強磁性ナノドット層を有する二重トンネル接合におけるTMRの増大 Peer-reviewed

    介川 裕章, 中村 新一, 廣畑 貴文, 手束 展規, 猪俣 浩一郎, 杉本 諭

    日本応用磁気学会誌　29　(3)　274-277　2005

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.29.274 　

    ISSN： 0285-0192

    More details Close

    We observed spin-dependent tunneling in Co90Fe10/AlOx/Co90Fe10/AlOx/Co90Fe10 ferromagnetic double tunnel junctions. A middle Co90Fe10 layer, which is inserted between two AlOx layers, is discontinuous due to the difference in the surface energy of these layers. The average diameter of Co90Fe10 particles was estimated to be 2.0-4.5 nm from cross-sectional transmission electron microscopy (TEM) images. At low temperature (< 50 K), a Coulomb gap is observed in current-voltage (I-V) curves, and the tunnel magnetoresistance (TMR) ratio within the gap enhances significantly with decreasing temperature, which indicates that the dominant electron transport is inelastic co-tunneling within the Coulomb gap. These observations in a ferromagnetic tunnel junction with 2-dimensional magnetic nano-particle layer insertion accord well with theoretical predictions by Takahashi and Maekawa [Phys. Rev. Lett. 80, 1758 (1998)].

  134. Spin-dependent quantum oscillations in magnetic tunnel junctions with Ru quantum wells Peer-reviewed

    T. Nozaki, Y. Jiang, Y. Kaneko, A. Hirohata, N. Tezuka, S. Sugimoto, K. Inomata

    Physical Review B - Condensed Matter and Materials Physics　70　(17)　1-4　2004/11

    DOI： 10.1103/PhysRevB.70.172401 　

    ISSN： 0163-1829

  135. Highly efficient spin filtering of ballistic electrons Peer-reviewed

    S. J. Steinmuller, T. Trypiniotis, W. S. Cho, A. Hirohata, W. S. Lew, C. A F Vaz, J. A C Bland

    Physical Review B - Condensed Matter and Materials Physics　69　(15)　1-153309　2004/04

    DOI： 10.1103/PhysRevB.69.153309 　

    ISSN： 0163-1829

  136. Highly efficient spin filtering of ballistic electrons in hybrid spin valve/semiconductor structures Peer-reviewed

    SJ Steinmuller, T Trypiniotis, A Hirohata, WS Cho, WS Lew, CAF Vaz, JAC Bland

    2004 INTERNATIONAL CONFERENCE ON MEMS, NANO AND SMART SYSTEMS, PROCEEDINGS　98-98　2004

  137. Optical studies of spin injection and detection at ferromagnet/semiconductor interfaces

    J.A.C. Bland, S.J. Steinmuller, A. Hirohata, W.S. Cho, Y.B. Xu, C.M. Guertler, G. Wastlbauer, A. Inonescu, T. Taniyama, T. Trypiniotis

    Europhys. News　34　(6)　240　2003

  138. Spin-polarized electron transport in a NiFe/GaAs Schottky diode Peer-reviewed

    A Hirohata, YB Xu, CM Guertler, JAC Bland, SN Holmes

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　226　(PART I)　914-916　2001/05

    DOI： 10.1016/S0304-8853(00)01061-1 　

    ISSN： 0304-8853

  139. Spin-polarized electron transport in ferromagnet/semiconductor hybrid structures induced by photon excitation

    Hirohata, A., Xu, Y.B., Guertler, C.M., Bland, J.A.C., Holmes, S.N.

    Physical Review B - Condensed Matter and Materials Physics　63　(10)　2001

    ISSN： 0163-1829

  140. Magnetoresistance of a domain wall at a submicron junction Peer-reviewed

    YB Xu, CAF Vaz, A Hirohata, HT Leung, CC Yao, JAC Bland, E Cambril, F Rousseaux, H Launois

    PHYSICAL REVIEW B　61　(22)　14901-14904　2000/06

    DOI： 10.1103/PhysRevB.61.R14901 　

    ISSN： 1098-0121

    eISSN： 1550-235X

Show all ︎Show first 5

Misc. 87

  1. 磁気トンネル接合(MTJ)素子の新材料(1)計算・データ科学の援用・準安定材料の開発—Advanced materials for magnetic tunnel junctions (MTJs)(1)Developments of metastable materials with the aid of computational and data sciences—TMR研究のこれまでとこれから : 室温TMR効果の発見から30年

    水上 成美, 白井 正文, 廣畑 貴文

    社団法人日本磁気学会研究会資料 = Bulletin of Topical Symposium of the Magnetics Society of Japan　253　27-30　2025/03/13

    Publisher: 東京 : 日本磁気学会

    ISSN： 1882-2940

  2. 磁気スキルミオンのカイラリティを利用する論理演算に向けた要素技術のシミュレーション—Simulated Logic Operation Using Chirality of Magnetic Skyrmion—特集 磁気スキルミオンの発展と最新の研究動向

    山田 啓介, 廣畑 貴文, 仲谷 栄伸

    まぐね = Magnetics Japan　18　(5)　210-216　2023

    Publisher: 東京 : 日本応用磁気学会

    ISSN： 1880-7208

  3. IEEE MAGNETICS SOCIETY

    Atsufumi Hirohata

    IEEE TRANSACTIONS ON MAGNETICS　59　(1)　2023/01

    DOI： 10.1109/TMAG.2022.3228721 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  4. Exploration of materials for tunnel magnetoresistive devices using experimental and computational approaches

    Mizukami Shigemi, Hirohata Atsufumi, Shirai Masafumi

    JSAP Annual Meetings Extended Abstracts　2021.2　144-144　2021/08/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2021.2.0_144 　

    eISSN： 2436-7613

  5. Electrical discrimination of magnetic-skyrmion chirality via spin-orbit and -transfer torques in a branched nanowire

    Yamada Keisuke, Hirohata Atsufumi, Nakatani Yoshinobu

    JSAP Annual Meetings Extended Abstracts　2021.2　1900-1900　2021/08/26

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2021.2.0_1900 　

    eISSN： 2436-7613

  6. Nanomagnetic Materials: Fabrication, Characterization and Application

    Akinobu Yamaguchi, Atsufumi Hirohata, Bethanie J.H. Stadler

    Nanomagnetic Materials: Fabrication, Characterization and Application　1-784　2021/01/01

    DOI： 10.1016/C2018-0-05445-6 　

  7. 英国流の研究費獲得術 : 英国的発想と日本的発想の違い

    廣畑 貴文

    現代化学 = Chemistry today　(594)　68-72　2020/09

    Publisher: 東京 : 東京化学同人

    ISSN： 0386-961X

  8. Spin-dependent Tunneling in the Plasma Oxidized Cr2O3 Barrier Magnetic Tunnel Junctions

    Ichinose Tomohiro, Elphick Kelvin, Hirohata Atsufumi, Mizukami Shigemi

    JSAP Annual Meetings Extended Abstracts　2019.2　2119-2119　2019/09/04

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2019.2.0_2119 　

    eISSN： 2436-7613

  9. Spintronics based random access memory: a review

    Sabpreet Bhatti, Rachid Sbiaa, Atsufumi Hirohata, Hideo Ohno, Shunsuke Fukami, S. N. Piramanayagam

    MATERIALS TODAY　20　(9)　530-548　2017/11

    DOI： 10.1016/j.mattod.2017.07.007 　

    ISSN： 1369-7021

    eISSN： 1873-4103

  10. Magnetic orientation property analysis of crashed guanine crystals derived from organisms

    Mizukawa Yuri, Iwasaka Masakazu, Hirohata Atsufumi

    JSAP Annual Meetings Extended Abstracts　2017.2　2144-2144　2017/08/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.11470/jsapmeeting.2017.2.0_2144 　

    eISSN： 2436-7613

  11. 防食塗装したSn添加鋼の長期耐食性評価

    奥野, 貴文, 廣畑, 幹人, 上村, 隆之, 伊藤, 義人

    平成28年度土木学会中部支部研究発表会講演概要集　57-58　2017/03

    Publisher: 土木学会

    More details Close

    平成28年度土木学会中部支部研究発表会 (2017年3月3日、金沢大学)。講演番号I－029

  12. γ-Al2O3バッファー層を用いたSi基板上のFe3O4作製

    高橋望, HUMINIUC Teoder, 山本雄太, 柳瀬隆, 島田敏宏, 廣畑貴文, 長浜太郎

    応用物理学会北海道支部/日本光学会北海道支部合同学術講演会講演予稿集　52nd-13th　2017

  13. 反強磁性材料の開発/欧州における研究状況

    廣畑貴文, HUMINIUC Teodor, SINCLAIR John, WU Haokaifeng, SAMIEPOUR Marjan, VALLEJO‐FERNANDEZ Gonzalo, O’GRADY Kevin, REISS Guenter, SZUNYOGH Laszlo, NOVAK Ulrich, 窪田崇秀, 高梨弘毅, 井波暢人, 小野寛太

    日本磁気学会研究会資料　209th　1‐6-6　2016/10/21

    Publisher: 日本磁気学会

    ISSN： 1882-2940

  14. Fabrication and characterization of rare-metal-free, antiferromagnetic Heusler alloy thim films

    Koki Takanashi, Atsuhumi Hirohata, Takahide Kubota

    日本磁気学会第203回研究会資料　31-34　2015/06/29

  15. Domain Wall Pinning for Racetrack Memory Using Exchange Bias.

    I. Polenciuc, A. J. Vick, D. A. Allwood, T. J. Hayward, G. Vallejo-Fernandez, A. Hirohata, K. O'Grady

    2015 IEEE MAGNETICS CONFERENCE (INTERMAG)　2015

  16. Heusler alloys in magnetic recording

    A Hirohata, G Vallejo-Fernandez, K O’Grady, G Reiss, U Nowak, L Szunyogh, K Takanashi, K Ono

    MAGNETICS TECHNOLOGY INTERNATIONAL2014　82-86　2014/09/24

  17. 防食塗装したSn添加鋼の腐食劣化特性と鋼橋への適用に関する一考察

    奥野, 貴文, 廣畑, 幹人, 上村, 隆之, 伊藤, 義人

    平成25年度土木学会中部支部研究発表会講演概要集　5-6　2014/03

    Publisher: 土木学会

    More details Close

    平成25年度土木学会中部支部研究発表会 (2014年3月7日、岐阜大学)。講演番号I－003

  18. Correlation of microstructure and transport properties of multilayered graphene spin valves on SiO2/Si Peer-reviewed

    L. Lari, G. Hughes, K. Muramoto, A. Hirohata, M. Shiraishi, V.K. Lazarov

    Journal of Physics: Conference Series　471　(1)　2013

    DOI： 10.1088/1742-6596/471/1/012048 　

  19. 24aPS-13 First principle calculation for the spin injection of Fe/GaAs contact

    Honda Syuta, Itoh Hiroyoshi, Inoue Jun-ichiro, Hirohata Atsufumi

    Meeting abstracts of the Physical Society of Japan　67　(1)　477-477　2012/03/05

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  20. Temperature estimation in a ferromagnetic FeNi nanowire involving a current-driven domain wall motion

    A. Yamaguchi, A. Yamaguchi, A. Yamaguchi, A. Hirohata, A. Hirohata, T. Ono, H. Miyajima

    Journal of Physics Condensed Matter　24　(2)　2012/01/18

    DOI： 10.1088/0953-8984/24/2/024201 　

    ISSN： 0953-8984

  21. Anomalous Hall voltage rectification and quantized spin-wave excitation induced by simultaneous application of dc and rf currents in a single-layered Ni81Fe19 nanoscale wire

    A. Yamaguchi, K. Motoi, A. Hirohata, H. Miyajima

    Physical Review B American Physical Society　79　(22)　224409　2009

    DOI： 10.1103/PhysRevB.79.224409 　

    ISSN： 1098-0121

  22. Spin polarization control through resonant states in an Fe/GaAs Schottky barrier

    S. Honda, H. Itoh, J. Inoue, H. Kurebayashi, T. Trypiniotis, C. H. W. Barnes, A. Hirohata, J. A. C. Bland

    PHYSICAL REVIEW B　78　(24)　245316　2008/12

    DOI： 10.1103/PhysRevB.78.245316 　

    ISSN： 1098-0121

  23. DC electrical response and impedance change induced by a microwave signal in a patterned ferromagnetic wire

    A. Yamaguchi, K. Motoi, A. Hirohata, N. Higashio, H. Miyajima

    SPINTRONICS　7036　703607　2008

    DOI： 10.1117/12.798309 　

    ISSN： 0277-786X

  24. Broadband ferromagnetic resonance of Ni81Fe19 wires using a rectifying effect

    A. Yamaguchi, K. Motoi, A. Hirohata, H. Miyajima, Y. Miyashita, Y. Sanada

    Physical Review B American Physical Society　78　(10)　104401　2008

    DOI： 10.1103/PhysRevB.78.104401 　

    ISSN： 1098-0121

  25. 19pZC-8 Spin-Current Interference in a Cu Nano-Ring

    Hirohata A., Yang T., Kimura T., Otani Y.

    Meeting abstracts of the Physical Society of Japan　62　(1)　464-464　2007/02/28

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  26. 23pXH-1 Spin-Current Interference in a Cu Nano-Ring

    Hirohata A., Yang T., Kimura T., Otani Y.

    Meeting abstracts of the Physical Society of Japan　61　(2)　344-344　2006/08/18

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  27. Heusler alloy/semiconductor hybrid structures

    A. Hirohata, A. Kikuchi, N. Tezuka, K. Inomata, J. S. Claydon, Y. B. Xu, G. van der Laan

    CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE　10　(2)　93-107　2006/04

    DOI： 10.1016/j.cossms.2006.11.006 　

    ISSN： 1359-0286

    eISSN： 1879-0348

  28. 28pSC-6 Quantum Spin Interference in a Cu Nano-Ring

    Hirohata A., Y. Tao, Kimura T., Otani Y.

    Meeting abstracts of the Physical Society of Japan　61　(1)　480-480　2006/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  29. Tunnel magnetoresistance enhancement in ferromagnetic tunnel junctions with ferromagnetic nano-particle layer insertion

    H. Sukegawa, S. Nakamura, A. Hirohata, N. Tezuka, N. Tezuka, S. Sugimoto, K. Inomata, K. Inomata

    INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference　1002　2005/12/12

  30. Substantial reduction of critical current for magnetization switching in an exchange-biased spin valve (vol 3, pg 361, 2004)

    Y Jiang, T Nozaki, S Abe, T Ochiai, A Hirohata, N Tezuka, K Inomata

    NATURE MATERIALS　4　(4)　353-353　2005/04

    DOI： 10.1038/nmat1355 　

    ISSN： 1476-1122

  31. 24aXN-8 Magnetic properties of epitaxial Co_2Cr_<1-x>Fe_xAl full Heusler alloy films

    Hirohata A, Kurebayashi K., Okamura S., Tezuka N., Inomata K.

    Meeting abstracts of the Physical Society of Japan　60　(1)　408-408　2005/03/04

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  32. Significant magnetoresistance enhancement due to a cotunneling process in a double tunnel junction with single discontinuous ferromagnetic layer insertion

    H Sukegawa, S Nakamura, A Hirohata, N Tezuka, K Inomata

    PHYSICAL REVIEW LETTERS　94　(6)　068304　2005/02

    DOI： 10.1103/PhysRevLett.94.068304 　

    ISSN： 0031-9007

  33. Bias voltage effect on tunnel magnetoresistance in fully epitaxial MgO double-barrier magnetic tunnel junctions

    T Nozaki, A Hirohata, N Tezuka, S Sugimoto, K Inomata

    APPLIED PHYSICS LETTERS　86　(8)　082501　2005/02

    DOI： 10.1063/1.1867559 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  34. Structural and Magnetic Properties of Co_2Cr_<1-x>Fe_xAl Thin Films with the L2_1 Structure

    HIROHATA A., KUREBAYASHI H., OKAMURA S., KIKUCHI M., MASAKI T., NOZAKI T., TEZUKA N., INOMATA K.

    Journal of the Magnetics Society of Japan　29　(2)　124-127　2005

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.29.124 　

    ISSN： 0285-0192 1880-4004

    More details Close

    We successfully grew Co2Cr1-xFexAl full Heusler films (0 ≤ x ≤ 1) with the L21 structure onto GaAs(001) substrates by achieving stoichiometry in an ultrahigh-vacuum molecular beam epitaxy chamber. The films develop epitaxial crystallinity with the relationship of Co2Cr1-xFexAl(001)‹110›||GaAs(001)‹110›, which induces very strong uniaxial magnetocrystalline anisotropy, except for x = 0. For x = 1, in particular, the film is almost a single phase and its magnetic moment per formula unit exhibits Slater-Pauling behavior. Films of this type were used to fabricate magnetic tunnel junctions with 8.8% and 4.9% tunnel magnetoresistance (TMR) ratios at room temperature for x = 1 with an Al-O tunnel barrier and x = 0.6 with a MgO barrier, respectively. The TMR ratio can be further enhanced by both realizing an L21 single phase and eliminating lattice distortion.

  35. Spin-dependent quantum oscillations in magnetic tunnel junctions with Ru quantum wells

    T Nozaki, Y Jiang, Y Kaneko, A Hirohata, N Tezuka, S Sugimoto, K Inomata

    PHYSICAL REVIEW B　70　(17)　172401　2004/11

    DOI： 10.1103/PhysRevB.70.172401 　

    ISSN： 1098-0121

  36. Structural and Magnetic Properties of L2_1-Structured Co_2(Cr, Fe)Al Thin Films

    HIROHATA A., KUREBAYASHI H., OKAMURA S., KIKUCHI M., MASAKI T., NOZAKI T., TEZUKA N., INOMATA K.

    28　399-399　2004/09/21

  37. Crystalline Growth and Magnetic/Electrical Transport Properties of Fe/MgO Layers Grown on GaAs(100)

    KUREBAYASHI H., HIROHATA A., TEZUKA N., SUGIMOTO S., INOMATA K.

    28　104-104　2004/09/21

  38. Current Induced Magnetization Switching in the CPP-GMR Device with a Synthetic Antiferromagnetic free Layer

    OCHIAI T., JIANG Yong, HIROHATA A., TEZUKA N., SUGIMOTO S., INOMATA K.

    28　101-101　2004/09/21

  39. 13aWB-4 Structural and Magnetic Properties of Co_2Cr_<1-x>Fe_xAl Full-Heusler Thin Films Grown on GaAs(001)

    Hirohata A, Kurebayashi K, Okamura S, Tezuka N, Inomata K

    Meeting abstracts of the Physical Society of Japan　59　(2)　383-383　2004/08/25

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  40. Substantial reduction of critical current for magnetization switching in an exchange-biased spin valve

    Y Jiang, T Nozaki, S Abe, T Ochiai, A Hirohata, N Tezuka, K Inomata

    NATURE MATERIALS　3　(6)　361-364　2004/06

    DOI： 10.1038/nmat1120 　

    ISSN： 1476-1122

    eISSN： 1476-4660

  41. Magnetoresistance in tunnel junctions using Co-2(Cr,Fe)Al full Heusler alloys

    K Inomata, N Tezuka, S Okamura, H Kurebayashi, A Hirohata

    JOURNAL OF APPLIED PHYSICS　95　(11)　7234-7236　2004/06

    DOI： 10.1063/1.1651813 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  42. Effective reduction of critical current for current-induced magnetization switching by a Ru layer insertion in an exchange-biased spin valve

    Y Jiang, S Abe, T Ochiai, T Nozaki, A Hirohata, N Tezuka, K Inomata

    PHYSICAL REVIEW LETTERS　92　(16)　167204　2004/04

    DOI： 10.1103/PhysRevLett.92.167204 　

    ISSN： 0031-9007

  43. Highly efficient spin filtering of ballistic electrons

    SJ Steinmuller, T Trypiniotis, WS Cho, A Hirohata, WS Lew, CAF Vaz, JAC Bland

    PHYSICAL REVIEW B　69　(15)　153309　2004/04

    DOI： 10.1103/PhysRevB.69.153309 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  44. Magnetic switching properties of magnetic tunnel junctions using a synthetic ferrimagnet free layer

    T Nozaki, Y Jiang, H Sukegawa, N Tezuka, A Hirohata, K Inomata, S Sugimoto

    JOURNAL OF APPLIED PHYSICS　95　(7)　3745-3748　2004/04

    DOI： 10.1063/1.1669053 　

    ISSN： 0021-8979

  45. 28aXR-6 Structural and Magnetic Properties of Co_2(Cr,Fe)Al Full-Heusler Alloys Grown on GaAs(100) Substrates

    Hirohata A., Kurebayashi H., Okamura S., Tezuka N., Inomata K.

    Meeting abstracts of the Physical Society of Japan　59　(1)　485-485　2004/03/03

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  46. Electron spin filtering in ferromagnet/semiconductor heterostructures

    JAC Bland, SJ Steinmuller, A Hirohata, WS Cho, YB Xu, CM Guertler, G Wastlbauer, A Ionescu, T Trypiniotis, SN Holmes

    JOURNAL OF PHYSICS D-APPLIED PHYSICS　36　(18)　2204-2210　2003/09

    DOI： 10.1088/0022-3727/36/18/005 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  47. Ballistic spin filtering across ferromagnet/semiconductor interfaces at room temperature

    A Hirohata, SJ Steinmueller, WS Cho, YB Xu, CM Guertler, G Wastlbauer, JAC Bland, SN Holmes

    PHYSICAL REVIEW B　66　(3)　035330　2002/07

    DOI： 10.1103/PhysRevB.66.035330 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  48. Test of ballistic spin-polarized electron transport across ferromagnet/semiconductor Schottky interfaces

    A Hirohata, CM Guertler, WS Lew, YB Xu, JAC Bland, SN Holmes

    JOURNAL OF APPLIED PHYSICS　91　(10)　7481-7483　2002/05

    DOI： 10.1063/1.1447198 　

    ISSN： 0021-8979

  49. Influence of crystalline structures on the domain configurations in controlled mesoscopic ferromagnetic wire junctions

    A Hirohata, YB Xu, JAC Bland, SN Holmes, E Cambril, Y Chen, F Rousseaux

    JOURNAL OF APPLIED PHYSICS　91　(10)　7308-7310　2002/05

    DOI： 10.1063/1.1458011 　

    ISSN： 0021-8979

  50. Geometric coercivity scaling in magnetic thin film antidot arrays

    Ruiz-Feal, I, L Lopez-Diaz, A Hirohata, J Rothman, CM Guertler, JAC Bland, LM Garcia, JM Torres, J Bartolome, F Bartolome, M Natali, D Decanini, Y Chen

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　242　(PART I)　597-600　2002/04

    DOI： 10.1016/S0304-8853(01)01108-8 　

    ISSN： 0304-8853

  51. Spin-polarized electron transport processes at the ferromagnet/semiconductor interface (vol 36, pg 2827, 2000)

    JAC Bland, A Hirohata, YB Xu, CM Guertler, SN Holmes

    IEEE TRANSACTIONS ON MAGNETICS　37　(4)　3084-3084　2001/07

    DOI： 10.1109/TMAG.2001.947076 　

    ISSN： 0018-9464

  52. Effects of interdot dipole coupling in mesoscopic epitaxial Fe(100) dot arrays

    YB Xu, A Hirohata, SM Gardiner, M Tselepi, J Rothman, M Klaui, L Lopez-Diaz, JAC Bland, Y Chen, E Cambril, F Rousseaux

    IEEE TRANSACTIONS ON MAGNETICS　37　(4)　2055-2057　2001/07

    DOI： 10.1109/20.951051 　

    ISSN： 0018-9464

  53. Spin-polarized electron transport in ferromagnet/semiconductor hybrid structures (invited)

    JAC Bland, A Hirohata, CM Guertler, YB Xu, M Tselepi

    JOURNAL OF APPLIED PHYSICS　89　(11)　6740-6744　2001/06

    DOI： 10.1063/1.1361045 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  54. Domain-wall trapping in controlled mesoscopic ferromagnetic wire junctions

    A Hirohata, YB Xu, CC Yao, HT Leung, WY Lee, SM Gardiner, DG Hasko, JAC Bland, SN Holmes

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　226　(PART II)　1845-1847　2001/05

    DOI： 10.1016/S0304-8853(00)00880-5 　

    ISSN： 0304-8853

  55. Spin-polarized electron transport in ferromagnet/semiconductor hybrid structures induced by photon excitation

    A Hirohata, YB Xu, CM Guertler, JAC Bland, SN Holmes

    PHYSICAL REVIEW B　63　(10)　104425-4　2001/03

    DOI： 10.1103/PhysRevB.63.104425 　

    ISSN： 1098-0121

    eISSN： 1550-235X

  56. Spin-polarized electron transport in ferromagnet/semiconductor Schottky barrier structures

    Journal of Magnetism and Magnetic Materials　226-230　914　2001

  57. Spin-dependent electron transport in ferromagnet/semiconductor Schottky barrier structures

    MRS 2000 Spring Meeting Symposia Proceedings　614　F5.4　2001

  58. Magnetic domain studies of permalloy wire-based structures with junctions

    A Hirohata, CC Yao, HT Leung, YB Xu, CM Guertler, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　36　(5)　3068-3070　2000/09

    DOI： 10.1109/20.908682 　

    ISSN： 0018-9464

  59. Magnetization reversal in mesoscopic Ni80Fe20 wires: A magnetic domain launching device

    WY Lee, A Hirohata, HT Leung, YB Xu, SM Gardiner, CC Yao, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　36　(5)　3018-3020　2000/09

    DOI： 10.1109/20.908661 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  60. Spin-polarized electron transport processes at the ferromagnet/semiconductor interface

    JAC Bland, A Hirohata, YB Xu, CM Guertler, SN Holmes

    IEEE TRANSACTIONS ON MAGNETICS　36　(5)　2827-2832　2000/09

    DOI： 10.1109/20.908601 　

    ISSN： 0018-9464

  61. Micromagnetism in mesoscopic epitaxial Fe dot arrays

    YB Xu, A Hirohata, L Lopez-Diaz, HT Leung, M Tselepi, SM Gardiner, WY Lee, JAC Bland, F Rousseaux, E Cambril, H Launois

    JOURNAL OF APPLIED PHYSICS　87　(9)　7019-7021　2000/05

    DOI： 10.1063/1.372917 　

    ISSN： 0021-8979

  62. Domain wall trapping in controlled submicron ferromagnetic elements

    A Hirohata, YB Xu, CC Yao, HT Leung, WY Lee, SM Gardiner, DG Hasko, JAC Bland, SN Holmes

    JOURNAL OF APPLIED PHYSICS　87　(9)　4727-4729　2000/05

    DOI： 10.1063/1.373140 　

    ISSN： 0021-8979

  63. Spin-dependent electron transport in NiFe/GaAs Schottky barrier structures

    A Hirohata, YB Xu, CM Guertler, JAC Bland

    JOURNAL OF APPLIED PHYSICS　87　(9)　4670-4672　2000/05

    DOI： 10.1063/1.373125 　

    ISSN： 0021-8979

  64. Domain nucleation processes in mesoscopic Ni80Fe20 wire junctions

    WY Lee, CC Yao, A Hirohata, YB Xu, HT Leung, SM Gardiner, S McPhail, BC Choi, DG Hasko, JAC Bland

    JOURNAL OF APPLIED PHYSICS　87　(6)　3032-3036　2000/03

    DOI： 10.1063/1.372295 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  65. Magnetic nanoscale dots on colloid crystal surfaces

    SP Li, WS Lew, YB Xu, A Hirohata, A Samad, F Baker, JAC Bland

    APPLIED PHYSICS LETTERS　76　(6)　748-750　2000/02

    DOI： 10.1063/1.125882 　

    ISSN： 0003-6951

  66. Magneto-resistance of a domain wall at a submicron junction

    XU Y B, VAZ C A F, HIROHATA A, LEUNG H T, YAO C C, BLAND J A C, CAMBRIL E, ROUSSEAUX F, LAUNOIS H

    Physical Review B　61　(22)　R14901-R14904　2000

    DOI： 10.1103/PhysRevB.61.R14901 　

    ISSN： 0163-1829

  67. Magnetic domain evolution in permalloy mesoscopic dots

    A Hirohata, HT Leung, YB Xu, CC Yao, WY Lee, JAC Bland, SN Holmes

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　3886-3888　1999/09

    DOI： 10.1109/20.800697 　

    ISSN： 0018-9464

  68. Effect of junction geometry on switching field and reversal behavior in permalloy wires

    WY Lee, YB Xu, CAF Vaz, A Hirohata, HT Leung, CJ Yao, BC Choi, JAC Bland, F Rousseaux, E Cambril, H Launois

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　3883-3885　1999/09

    DOI： 10.1109/20.800696 　

    ISSN： 0018-9464

  69. Pseudo-Hall effect and anisotropic magnetoresistance in a micronscale Ni80Fe20 device

    CC Yao, DG Hasko, WY Lee, A Hirohata, YB Xu, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　3616-3618　1999/09

    DOI： 10.1109/20.800608 　

    ISSN： 0018-9464

  70. Magnetization reversal and magnetic anisotropy in Co network nanostructures

    WY Lee, HT Leung, W Zhang, YB Xu, A Hirohata, CC Yao, BC Choi, DG Hasko, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　3475-3477　1999/09

    DOI： 10.1109/20.800562 　

    ISSN： 0018-9464

  71. Spin-dependent electron transport through the ferromagnet/semiconductor interface induced by photon excitation

    A Hirohata, YB Xu, CR Guertler, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　2910-2912　1999/09

    DOI： 10.1109/20.801022 　

    ISSN： 0018-9464

  72. Influence of lateral geometry on magnetoresistance and magnetisation reversal in Ni80Fe20 wires

    CC Yao, DG Hasko, WY Lee, A Hirohata, YB Xu, JAC Bland

    IEEE TRANSACTIONS ON MAGNETICS　35　(5)　2865-2867　1999/09

    DOI： 10.1109/20.801007 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  73. Magnetic anisotropy, magnetic moments and coupling of Cu/Co/Cu/Ni/Cu(001) trilayer

    G Lauhoff, A Hirohita, JAC Bland, J Lee, S Langridge, J Penfold

    JOURNAL OF PHYSICS-CONDENSED MATTER　11　(35)　6707-6713　1999/09

    DOI： 10.1088/0953-8984/11/35/309 　

    ISSN： 0953-8984

  74. Domain wall trapping probed by magnetoresistance and magnetic force microscopy in submicron ferromagnetic wire structures

    YB Xu, CAF Vaz, A Hirohata, CC Yao, WY Lee, JAC Bland, F Rousseaux, E Cambril, H Launois

    JOURNAL OF APPLIED PHYSICS　85　(8)　6178-6180　1999/04

    DOI： 10.1063/1.370213 　

    ISSN： 0021-8979

  75. Spin-dependent electron transport at the ferromagnet/semiconductor interface

    A Hirohata, YB Xu, CM Guertler, JAC Bland

    JOURNAL OF APPLIED PHYSICS　85　(8)　5804-5806　1999/04

    DOI： 10.1063/1.369925 　

    ISSN： 0021-8979

  76. Easy-axis transition in epitaxial face-centered-cubic Ni80Fe20/Ni/Cu(100)

    W Zhang, CAF Vaz, A Hirohata, JAC Bland

    JOURNAL OF APPLIED PHYSICS　85　(8)　4806-4808　1999/04

    DOI： 10.1063/1.370488 　

    ISSN： 0021-8979

  77. Perpendicular magnetic anisotropy of exchange coupled Co/Cu/Ni/Cu/Si(001) structures

    Lauhoff G., Lee J., Lee W. Y., Hirohata A., Samad A., Bland J. A. C., Langridge S., penfold J.

    Journal of the Magnetics Society of Japan　23　(1)　572-574　1999

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.23.572 　

    ISSN： 0285-0192

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    Polar magneto-optic Kerr effect (MOKE) measurements on epitaxial Cu/22ACo/0-49Å Cu/53Å Ni/Cu/Si(001) structures reveal that the Ni magnetisation is aligned in-plane for zero Cu spacer layer thickness and becomes increasingly aligned out-of plane with increasing Cu spacer layer thickness, whereas an in-plane remanence for Co is always observed. Polarised neutron reflection (PNR) measurements at room temperature yield at room temperature a slightly reduced magnetisation of 1.57 ± 0.08μB for Co and 0.50 ± 0.04μB for Ni for a Cu/22Å Co/10Å Cu/53Å Ni/Cu/Si(001) structure. PNR measurements yield also a reduced in-plane remanence for both Co and Ni. This could suggest either a canted magnetisation or multidomain state at remanence. The Latter mechanism is supported by magnetic force microscopy images.

  78. Magnetic properties of martensite in Fe-Ni alloy measured by means of scanning probe microscopy

    A Hirohata, T Ono, H Miyajima

    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　177　(Pt.2)　1243-1244　1998/01

    DOI： 10.1016/S0304-8853(97)00571-4 　

    ISSN： 0304-8853

  79. Micromagnetic configurations of martensite in Fe-Ni alloys

    A Hirohata, H Miyajima

    JOURNAL OF APPLIED PHYSICS　81　(8)　5665-5667　1997/04

    DOI： 10.1063/1.364689 　

    ISSN： 0021-8979

  80. 28a-PS-122 Magnetic domain structure of ferromagneticcrystals observed by means of MFM

    Hirohata A., Miyajima H, Yuasa H., Nozaki Y.

    Meeting abstracts of the Physical Society of Japan　52　(1)　433-433　1997/03/17

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  81. Observation of Magnetic Domain Structures in Martensites by Means of MFM and AFM

    HIROHATA A., MIYAJIMA H.

    Journal of the Magnetics Society of Japan　21　(4)　401-404　1997

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.21.401 　

    ISSN： 0285-0192

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    The martensitic structure and magnetic domain structure of Fe1-xNix system (0.30≤x≤0.32) were investigated by means of non-contact atomic force microscopy and magnetic force microscopy. The martensite has a stripe domain structure whose period decreases with the Ni composition. The magnetic anisotropy constant in the martensite was estimated to be 2×104 J/m3, whose magnitude is the same order as that of Fe or Ni metal.

  82. Surface magnetic structure of Fe-Ni martensites observed by means of MFM

    Hirohata A., Miyajima H.

    Abstracts of the meeting of the Physical Society of Japan. Sectional meeting　1996　(3)　126-126　1996/09/13

    Publisher: The Physical Society of Japan (JPS)

  83. Observation of magnetic domain structure in martensites by means of MFM and AFM

    HIROHATA A., MIYAJIMA H.

    20　327-327　1996/09/01

  84. 1P-PSB-65 Surface observation of magnetic structure in FeNi martensites by means of MFM

    Hirohata A., Otani Y., Miyajima H.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　51　(3)　199-199　1996/03/15

    Publisher: The Physical Society of Japan (JPS)

  85. Observation of the Magnetic Domain Structure of Martensites by Means of MFM

    HIROHATA A., YUASA S., OTANI Y., MIYAJIMA H.

    Journal of the Magnetics Society of Japan　20　(2)　273-276　1996

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/jmsjmag.20.273 　

    ISSN： 0285-0192 1880-4004

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    The martensitic structure and magnetic domain structure of Fe0.75Pt0.25 were investigated by means of noncontact atomic force microscope (NC-AFM) and magnetic force microscope (MFM). The lattice constant and the crystalline structure were determined by X-ray diffactometry.It was found that there exist two types of martensitic structures in Fe0.75Pt0.25. This fact can be explained by a combination of the habit planes of twinning deformation.The magnetic stripe domain structures on the martensites were observed. The relationship between the martensitic and the magnetic structure of Fe0.75Pt0.25 was determined.

  86. Observation of magnetic domain structure in martensite by means of MFM

    HIROHATA A., YUASA S., OTANI Y., MIYAJIMA H.

    19　55-55　1995/09/01

  87. Study on the magnetic domain structures and the magnetization processes in YIG films by means of MFM

    Yokoyama H., Hirohata A., Otani Y., Miyajima H.

    Abstracts of the meeting of the Physical Society of Japan. Annual meeting　50　(3)　191-191　1995/03/16

    Publisher: The Physical Society of Japan (JPS)

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Books and Other Publications 2

  1. Heusler alloys : properties, growth, applications

    Felser Claudia, Hirohata Atsufumi

    Springer　2016

    ISBN: 9783319214481

  2. "Optical studies of electron spin transmission," in "Ultrathin Magnetic Structures IV"

    Springer　2005

Industrial Property Rights 10

  1. パルス生成装置

    廣畑 貴文

    Property Type: Patent

  2. スピン制御機構及びスピンデバイス

    廣畑 貴文

    Property Type: Patent

  3. スピンバルブ素子

    廣畑 貴文

    Property Type: Patent

  4. スピン偏極トランジスタ素子

    廣畑 貴文

    Property Type: Patent

  5. スピンモータ及びスピン回転部材

    廣畑 貴文

    Property Type: Patent

  6. スピン制御機構及びスピンデバイス

    廣畑 貴文

    特許第6090878号

    Property Type: Patent

  7. スピンバルブ素子

    廣畑 貴文

    特許第5645181号

    Property Type: Patent

  8. スピン偏極トランジスタ素子

    廣畑 貴文

    特許第5569851号

    Property Type: Patent

  9. スピンモータ及びスピン回転部材

    廣畑 貴文

    特許第5534493号

    Property Type: Patent

  10. An optically addressed spin-polarised diode sensor

    Property Type: Patent

    More details Close

    Basic British Patent (AU8608701) and PCT/GB01/04088 (WO 02/23638)

Show all Show first 5

Research Projects 5

  1. 持続可能社会に向けたスピントロニクス材料・素子の基盤研究

    廣畑 貴文

    Offer Organization: 科学技術振興機構

    Category: 国際的な科学技術共同研究などの推進/先端国際共同研究推進事業/ASPIRE/単独公募(トップ)

    2024 - 2029

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    持続可能社会実現のための基幹技術となるような、高エネルギー効率を有するスピントロニクス材料・素子開発のための基盤研究を日欧で協力しながら進める。日本側チームは全日本体制で材料開発を主導し、新奇材料を用いた面直構造を有する素子化を行う計画である。欧州側チームは新奇材料の評価並びに同材料を用いた面内構造素子化への道筋作りを予定している。両チームによる研究を通して新たなスピントロニクス素子とその高エネルギー変換効率化を実現することを目指す。

  2. ビッグデータ時代に対応するスピントロニクス論理メモリ回路の開発

    廣畑 貴文

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 国際共同研究加速基金(帰国発展研究)

    Institution: 東北大学

    2023/03/01 - 2026/03/31

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    英国ヨーク大学から装置移設の手配を進めた。11月末に訪英し3業者(英オックスフォードインストゥルメンツ社、独イオントフ社、日エイコー社)と装置の梱包を進める計画であったが、ヨーク大学から作業開始日に急遽500万ポンドの対人・対物保険に加入しなければ作業できないと言われ、作業を中断する羽目になった。このような保険は英国の企業にのみ適用されるものであり、英オックスフォードインストゥルメンツ社については本社から書類提供を受けて半日程度の遅れで作業が完了した。しかしながら日エイコー社に関しては、日本出国後の旅行保険の変更ができないこと、現地の保険会社は英国に本拠地がない企業の保険を引き受けてもらえないことから、作業を切り上げて帰国してもらうことになった。現在日本の保険会社に特注で設定をお願いしている状況である(先方からはこのような保険を求められたことは前例がないとのことで、特別に保険を今回の作業に限って作成する必要があり、100万円程度の保険料となる可能性があるとのこと)。また独イオントフ社は翌週の作業予定を変更し、同国内で別途保険に加入してもらい1月中旬に作業を行ってもらった。 以上の変更に伴い追加経費が必要となり現在ヨーク大学への請求の可能性を模索している。上述の保険に関してはヨーク大学在籍中に周知されておらず、また元同僚達も知らないとのことであり、極めて不公平なものと考えている。さらに一部の備品なども紛失しており、ヨーク大学に回復を依頼しているが回答が得られていない状況で、装置移設を妨害していると見なされても仕方がない状況である。従って、当初は年度内の移設の予定であったが大幅にずれ込み、試料作製・測定が2024年度にも難しいことから、現在大阪大学などに試料作製を依頼できるか交渉中で、測定装置に関しても本学ナノスピン実験施設から予備のものを借り受けて実験準備をしている。

  3. ナノ・スピンモーターの開発

    廣畑 貴文

    Offer Organization: 科学技術振興機構

    Category: 戦略的な研究開発の推進/戦略的創造研究推進事業/さきがけ

    2009 - 2014

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    現在のナノロボティクスにおいて、重要な課題である高効率で微細化された駆動系の組み込みの解決策として、本研究では電子スピンを利用したスピンモーターの開発を行います。具体的には、金属磁性体研究と半導体研究に関する知見を駆使し、ナノスケール永久磁石の電気的制御によるナノモーターを実現しようとするものであり、将来のナノシステム作製における非常に重要な基幹技術となると期待される。

  4. ナノ・スケール強磁性素子の磁気・電気伝導特性 Competitive

    System: フロンティア研究

    2005 -

  5. ホイスラー合金薄膜の作成と結晶構造・磁気特性の評価 Competitive

    2003 - 2004