Details of the Researcher

PHOTO

Takahide Kubota
Section
Graduate School of Engineering
Job title
Specially Appointed Associate Professor(Research)
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

Researcher ID
B-7784-2010

Research History 3

  • 2022/01 - Present
    Tohoku University　Department of Advanced Spintronics Medical Engineerng, Graduate School of Engineering　Specially Appointed Associate Professor

  • 2013/04 - 2021/12
    Tohoku University　Magnetic Materials Laboratory, Institute for Materials Research　Associate Professor

  • 2010/04 - 2013/03
    Tohoku University　Advanced Institute for Materials Research　Research Associate

Committee Memberships 3

  • IEEE Magnetics Society　Standards Committee

    2023/01 - Present

  • Japan Society of Applied Physics　Program Committee

    2022/10 - Present

  • 公益社団法人 日本磁気学会　論文・編集委員会委員

    2016/11 - 2021/05

Professional Memberships 3

  • Institute of Electrical and Electronics Engineering (IEEE)

  • Magnetic Society of Japan

  • Japan Society of Applied Physics

Research Interests 6

  • Machine Learning

  • magnetic field sensor

  • spin dependent transpor

  • Heusler alloy

  • magnetic thin film

  • Spintronics

Research Areas 3

  • Nanotechnology/Materials / Thin-film surfaces and interfaces /

  • Nanotechnology/Materials / Crystal engineering /

  • Nanotechnology/Materials / Applied materials /

Awards 6

  1. 原田奨励賞

    2018/07　本多記念会

  2. トーキン財団特別賞

    2018/03　トーキン科学技術振興財団

  3. トーキン科学技術賞

    2018/03　トーキン科学技術振興財団

  4. 応用物理学会 第39回講演奨励賞

    2016/03　公益社団法人 応用物理学会

  5. The 74th JSAP Autumn Meeting 2013 Poster Award

    2013/10　Japan Society of Applied Physics　Magnetization dynamics in Mn-Ga/Fe exchange coupled bilayer thin films

  6. ISSAMMA-2007 Best Postor Award

    2007/05　International Symposium on Advanced Magnetic Materials and Applications　Tunneling Spin Polarization of Co2MnSi Heusler Alloy

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Papers 138

  1. Magnetization Precession at Sub-Terahertz Frequencies in Polycrystalline Cu2Sb-Type (Mn-Cr)AlGe Ultrathin Films Peer-reviewed

    Yuta Sasaki, Ryoya Hiramatsu, Yohei Kota, Takahide Kubota, Yoshiaki Sonobe, Akimasa Sakuma, Koki Takanashi, Shinya Kasai, Yukiko K. Takahashi

    SMALL　18　(20)　2022/05

    DOI： 10.1002/smll.202200378 　

    ISSN： 1613-6810

    eISSN： 1613-6829

  2. Magnetoelastic anisotropy in Heusler-type Mn2-delta CoGa1+delta films Peer-reviewed

    Takahide Kubota, Daichi Takano, Yohei Kota, Shaktiranjan Mohanty, Keita Ito, Mitsuhiro Matsuki, Masahiro Hayashida, Mingling Sun, Yukiharu Takeda, Yuji Saitoh, Subhankar Bedanta, Akio Kimura, Koki Takanashi

    PHYSICAL REVIEW MATERIALS　6　(4)　2022/04

    DOI： 10.1103/PhysRevMaterials.6.044405 　

    ISSN： 2475-9953

  3. Perpendicular magnetic anisotropy in ultra-thin Cu2Sb-type (Mn-Cr)AlGe films fabricated onto thermally oxidized silicon substrates Peer-reviewed

    Takahide Kubota, Keita Ito, Rie Y. Umetsu, Koki Takanashi

    APPLIED PHYSICS LETTERS　118　(26)　2021/06

    DOI： 10.1063/5.0049899 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  4. Current perpendicular-to-plane giant magnetoresistance using an L12 Ag3 Mg spacer and Co2 Fe0.4 Mn0.6 Si Heusler alloy electrodes: Spacer thickness and annealing temperature dependence Peer-reviewed

    Kubota, T., Ina, Y., Wen, Z., Narisawa, H., Takanashi, K.

    Physical Review Materials　1　(4)　044402-044402　2017

    DOI： 10.1103/PhysRevMaterials.1.044402 　

  5. Magnetic and transport properties of tetragonal- or cubic-Heusler-type Co-substituted Mn-Ga epitaxial thin films Peer-reviewed

    Kubota, T., Ouardi, S., Mizukami, S., Fecher, G.H., Felser, C., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　113　(17)　2013

    DOI： 10.1063/1.4799143 　

  6. Composition dependence of magnetoresistance effect and its annealing endurance in tunnel junctions having Mn-Ga electrode with high perpendicular magnetic anisotropy Peer-reviewed

    Kubota, T., Araidai, M., Mizukami, S., Zhang, X., Ma, Q., Naganuma, H., Oogane, M., Ando, Y., Tsukada, M., Miyazaki, T.

    Applied Physics Letters　99　(19)　2011

    DOI： 10.1063/1.3659484 　

  7. Half-metallicity and Gilbert damping constant in Co2 Fex Mn1-x Si Heusler alloys depending on the film composition Peer-reviewed

    Kubota, T., Tsunegi, S., Oogane, M., Mizukami, S., Miyazaki, T., Naganuma, H., Ando, Y.

    Applied Physics Letters　94　(12)　122504　2009

    DOI： 10.1063/1.3105982 　

  8. Enhanced orbital magnetic moment in an FeCo-BaF2 granular film revealed by x-ray magnetic circular dichroism

    Keita Ito, Nobukiyo Kobayashi, Kenji Ikeda, Takumi Ichimura, Mitsuhiro Matsuki, Takahide Kubota, Kenta Amemiya, Akio Kimura, Koki Takanashi

    Journal of Magnetism and Magnetic Materials　606　172361-172361　2024/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.jmmm.2024.172361 　

    ISSN： 0304-8853

  9. Negative anomalous Nernst coefficient in a MnAlGe film and its enhancement in a (Mn-Cr)AlGe film Peer-reviewed

    Keita Ito, Takahide Kubota, Koki Takanashi

    Physical Review Applied　21　(5)　054012-1-7　2024/05

    DOI： 10.1103/PhysRevApplied.21.054012 　

  10. Influence of epitaxial growth on spin current transmission of NiO films

    Takumi Yamazaki, Takeshi Seki, Takahide Kubota, Koki Takanashi

    Applied Physics Express　16　(8)　083003-083003　2023/08/01

    Publisher: IOP Publishing

    DOI： 10.35848/1882-0786/acecd5 　

    ISSN： 1882-0778

    eISSN： 1882-0786

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    Abstract This letter reports the effect of the epitaxial growth of NiO films on its spin current transmission. Two sample series of Pt/NiO/CoFeB, including epitaxial and polycrystalline NiO, were prepared using different deposition conditions. The spin current transmission of NiO is evaluated using the thermo-spin effects in the trilayers. Epitaxial NiO exhibits a non-monotonic behavior in the NiO thickness dependence of spin current transmission, while this behavior is smeared out in polycrystalline NiO. The non-monotonic behavior implies the presence of multiple spin transport mechanisms, which becomes apparent with epitaxial growth.

  11. Perpendicular Magnetic Anisotropy of an Ultrathin Fe Layer Grown on NiO(001)

    Soki Kobayashi, Hiroki Koizumi, Hideto Yanagihara, Jun Okabayashi, Takahiro Kondo, Takahide Kubota, Koki Takanashi, Yoshiaki Sonobe

    Physical Review Applied　19　(6)　2023/06/01

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevapplied.19.064005 　

    eISSN： 2331-7019

  12. 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

  13. Superconducting fluctuation effect on epitaxially layered films of superconductor NbN and half-metallic Heusler alloy Co2MnSi

    Iduru Shigeta, Shuta Oku, Takahide Kubota, Shojiro Kimura, Takeshi Seki, Bunju Shinozaki, Satoshi Awaji, Koki Takanashi, Masahiko Hiroi

    AIP Advances　13　(2)　025116-025116　2023/02/01

    Publisher: AIP Publishing

    DOI： 10.1063/9.0000584 　

    eISSN： 2158-3226

    More details Close

    Superconducting properties were investigated in epitaxially layered films consisting of superconductor NbN and half-metallic Heusler alloy Co2MnSi (CMS). Temperature dependence of the electrical resistivity ρ( T) was measured by applying perpendicular magnetic fields to the surface of NbN/CMS films. With the increase of the CMS thickness dCMS, the upper critical field μ0 Hc2 decreased monotonically, but the superconducting transition temperature Tc had the minimum of 10.1 K at dCMS ≈ 5 nm. The Tc behavior was in qualitative agreement with the theory of the π-coupling. The pair-breaking parameter δ determined by the superconducting fluctuation theory took the maximum at dCMS = 3 ∼ 5 nm, which would be related to the minimum of Tc. The experimental results reveal that the superconductivity of the NbN layer in NbN/CMS films is affected by the interplay between the superconducting NbN layer and the half-metallic CMS layer.

  14. Anisotropic Magnetoresistance Effect in Bulk Single-Crystal Half-Metallic Heusler Alloys

    Takahiro Tanaka, Takahide Kubota, Satoshi Kokado, Rie Y. Umetsu

    2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings　2023

    DOI： 10.1109/INTERMAGShortPapers58606.2023.10228717 　

  15. 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　1-1　2023

    Publisher: Institute of Electrical and Electronics Engineers (IEEE)

    DOI： 10.1109/access.2023.3326448 　

    eISSN： 2169-3536

  16. Generation of terahertz transients from Co2Fe0.4Mn0.6Si Heusler alloy/heavy-metal bilayers

    S. Heidtfeld, R. Adam, T. Kubota, K. Takanashi, D. Cao, C. Schmitz-Antoniak, D.E. Bürgler, F. Wang, C. Greb, G. Chen, I. Komissarov, H. Hardtdegen, M. Mikulics, R. Sobolewski, S. Suga, C.M. Schneider

    Journal of Magnetism and Magnetic Materials　547　168791-168791　2022/04

    Publisher: Elsevier BV

    DOI： 10.1016/j.jmmm.2021.168791 　

    ISSN： 0304-8853

  17. Strain-Induced Large Anomalous Nernst Effect in Polycrystalline Co2MnGa/AlN Multilayers Peer-reviewed

    Jian Wang, Yong-Chang Lau, Weinan Zhou, Takeshi Seki, Yuya Sakuraba, Takahide Kubota, Keita Ito, Koki Takanashi

    ADVANCED ELECTRONIC MATERIALS　2022/04

    DOI： 10.1002/aelm.202101380 　

    ISSN： 2199-160X

  18. Nanoscale-Thick Ni-Based Half-Heusler Alloys with Structural Ordering-Dependent Ultralow Magnetic Damping: Implications for Spintronic Applications Peer-reviewed

    Ruma Mandal, Ivan Kurniawan, Ippei Suzuki, Zhenchao Wen, Yoshio Miura, Takahide Kubota, Koki Takanashi, Tadakatsu Ohkubo, Kazuhiro Hono, Yukiko K. Takahashi

    ACS APPLIED NANO MATERIALS　5　(1)　569-577　2022/01

    DOI： 10.1021/acsanm.1c03378 　

    eISSN： 2574-0970

  19. Generation of terahertz transients from Co2Fe0.4Mn0.6Si -Heusler-alloy/normal-metal nanobilayers excited by femtosecond optical pulses Peer-reviewed

    Sarah Heidtfeld, Roman Adam, Takahide Kubota, Koki Takanashi, Derang Cao, Carolin Schmitz-Antoniak, Daniel E. Bürgler, Fangzhou Wang, Christian Greb, Genyu Chen, Ivan Komissarov, Hilde Hardtdegen, Martin Mikulics, Roman Sobolewski, Shigemasa Suga, Claus M. Schneider

    Physical Review Research　3　(4)　2021/10/11

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevresearch.3.043025 　

    eISSN： 2643-1564

  20. Microstructures and Interface Magnetic Moments in Mn2VAl/Fe Layered Films Showing Exchange Bias Peer-reviewed

    Takahide Kubota, Yusuke Shimada, Tomoki Tsuchiya, Tomoki Yoshikawa, Keita Ito, Yukiharu Takeda, Yuji Saitoh, Toyohiko J. Konno, Akio Kimura, Koki Takanashi

    NANOMATERIALS　11　(7)　2021/07

    DOI： 10.3390/nano11071723 　

    eISSN： 2079-4991

  21. Evaluation of edge domains in giant magnetoresistive junctions Peer-reviewed

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

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

    Publisher: AIP Publishing

    DOI： 10.1063/5.0049315 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  22. Heusler alloys for spintronic devices: review on recent development and future perspectives Peer-reviewed

    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　2021/03

    DOI： 10.1080/14686996.2020.1812364 　

    ISSN： 1468-6996

    eISSN： 1878-5514

  23. Enhancement of the anomalous Nernst effect in Ni/Pt superlattices Peer-reviewed

    T. Seki, Y. Sakuraba, K. Masuda, A. Miura, M. Tsujikawa, K. Uchida, T. Kubota, Y. Miura, M. Shirai, K. Takanashi

    Physical Review B　103　(2)　2021/01/06

    Publisher: American Physical Society (APS)

    DOI： 10.1103/physrevb.103.l020402 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  24. MgO template effect for perpendicular magnetic anisotropy in (001)-textured poly-crystalline MnAlGe films Peer-reviewed

    Takahide Kubota, Keita Ito, Rie Y. Umetsu, Masaki Mizuguchi, Koki Takanashi

    AIP ADVANCES　11　(1)　2021/01

    DOI： 10.1063/9.0000138 　

    eISSN： 2158-3226

  25. Scaling of quadratic and linear magneto-optic Kerr effect spectra with L2(1) ordering of Co2MnSi Heusler compound Peer-reviewed

    Robin Silber, Daniel Kral, Ondrej Stejskal, Takahide Kubota, Yasuo Ando, Jaromir Pistora, Martin Veis, Jaroslav Hamrle, Timo Kuschel

    APPLIED PHYSICS LETTERS　116　(26)　2020/06

    DOI： 10.1063/5.0008427 　

    ISSN： 0003-6951

    eISSN： 1077-3118

  26. Interlayer exchange coupling and spin Hall effect through an Ir-doped Cu nonmagnetic layer Peer-reviewed

    Hiroto Masuda, Takeshi Seki, Yong-Chang Lau, Takahide Kubota, Koki Takanashi

    PHYSICAL REVIEW B　101　(22)　2020/06

    DOI： 10.1103/PhysRevB.101.224413 　

    ISSN： 2469-9950

    eISSN： 2469-9969

  27. Efficiency of ultrafast optically induced spin transfer in Heusler compounds

    Daniel Steil, Jakob Walowski, Felicitas Gerhard, Tobias Kiessling, Daniel Ebke, Andy Thomas, Takahide Kubota, Mikihiko Oogane, Yasuo Ando, Johannes Otto, Andreas Mann, Moritz Hofherr, Peter Elliott, John Kay Dewhurst, Günter Reiss, Laurens Molenkamp, Martin Aeschlimann, Mirko Cinchetti, Markus Münzenberg, Sangeeta Sharma, Stefan Mathias

    Physical Review Research　2020/05/20

    DOI： 10.1103/PhysRevResearch.2.023199 　

  28. Epitaxially grown Cu<inf>2</inf>Sb-type MnGaGe films with large perpendicular magnetic anisotropy Peer-reviewed

    Sun, M., Kubota, T., Ito, K., Takahashi, S., Hirayama, Y., Sonobe, Y., Takanashi, K.

    Applied Physics Letters　116　(6)　2020

    DOI： 10.1063/1.5140398 　

  29. Perpendicular magnetic anisotropy of (001)-textured poly-crystalline MnAlGe films Peer-reviewed

    Kubota, T., Kota, Y., Ito, K., Umetsu, R.Y., Sun, M., Mizuguchi, M., Takanashi, K.

    AIP Advances　10　(1)　2020

    DOI： 10.1063/1.5130388 　

    eISSN： 2158-3226

  30. 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)　2020

    Publisher: {IOP} Publishing

    DOI： 10.1088/1361-6463/ab47b6 　

  31. Structural-order dependence of anomalous Hall effect in Co<inf>2</inf>MnGa topological semimetal thin films Peer-reviewed

    Wang, Q., Wen, Z., Kubota, T., Seki, T., Takanashi, K.

    Applied Physics Letters　115　(25)　252401-1-252401-5　2019

    DOI： 10.1063/1.5127553 　

  32. Spin-charge conversion in NiMnSb Heusler alloy films Peer-reviewed

    Wen, Z., Qiu, Z., Tölle, S., Gorini, C., Seki, T., Hou, D., Kubota, T., Eckern, U., Saitoh, E., Takanashi, K.

    Science Advances　5　(12)　eaaw9337-1-eaaw9337-7　2019

    DOI： 10.1126/sciadv.aaw9337 　

  33. Current-perpendicular-to-plane giant magnetoresistance effects using Heusler alloys Peer-reviewed

    Kubota, T., Wen, Z., Takanashi, K.

    Journal of Magnetism and Magnetic Materials　492　165667　2019

    DOI： 10.1016/j.jmmm.2019.165667 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  34. Anomalous Ettingshausen effect in ferrimagnetic Co-Gd Peer-reviewed

    Seki, T., Miura, A., Uchida, K.-I., Kubota, T., Takanashi, K.

    Applied Physics Express　12　(2)　2019

    DOI： 10.7567/1882-0786/aafb5a 　

    ISSN： 1882-0778

    eISSN： 1882-0786

  35. Temperature dependence of current-perpendicular-to-plane giant magnetoresistance in the junctions with interface tailored Heusler alloy electrodes Peer-reviewed

    Kubota, T., Ina, Y., Wen, Z., Takanashi, K.

    Journal of Magnetism and Magnetic Materials　474　365-368　2019

    DOI： 10.1016/j.jmmm.2018.11.051 　

    ISSN： 0304-8853

    eISSN： 1873-4766

  36. Blocking temperature enhancement in Ni <inf>2</inf> MnAl/Fe bilayers by thermal treatments Peer-reviewed

    Tsuchiya, T., Kubota, T., Sasaki, T., Takanashi, K.

    Journal of Magnetism and Magnetic Materials　478　206-210　2019

    Publisher: Elsevier {BV}

    DOI： 10.1016/j.jmmm.2019.01.094 　

  37. Perpendicularly magnetized Cu<inf>2</inf>Sb type (Mn-Cr)AlGe films onto amorphous SiO<inf>2</inf> Peer-reviewed

    Kubota, T., Kota, Y., Ito, K., Umetsu, R.Y., Sun, M., Mizuguchi, M., Takanashi, K.

    Applied Physics Express　12　(10)　2019

    Publisher: Japan Society of Applied Physics

    DOI： 10.7567/1882-0786/ab3e2d 　

  38. Spin-Hall and anisotropic magnetoresistance in ferrimagnetic Co-Gd/Pt layers Peer-reviewed

    Zhou, W., Seki, T., Kubota, T., Bauer, G.E.W., Takanashi, K.

    Physical Review Materials　2　(9)　2018

    DOI： 10.1103/PhysRevMaterials.2.094404 　

  39. Size dependence of vortex-type spin torque oscillation in a Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si Heusler alloy disk Peer-reviewed

    Seki, T., Kubota, T., Yamamoto, T., Takanashi, K.

    Journal of Physics D: Applied Physics　51　(7)　2018

    DOI： 10.1088/1361-6463/aaa748 　

  40. Epitaxial CuN Films with Highly Tunable Lattice Constant for Lattice-Matched Magnetic Heterostructures with Enhanced Thermal Stability Peer-reviewed

    Wen, Z., Kubota, T., Takanashi, K.

    Advanced Electronic Materials　4　(1)　2018

    DOI： 10.1002/aelm.201700367 　

  41. Interface tailoring effect for Heusler based CPP-GMR with an L1<inf>2</inf>-Type Ag<inf>3</inf>Mg spacer Peer-reviewed

    Kubota, T., Ina, Y., Wen, Z., Takanashi, K.

    Materials　11　(2)　219-219　2018

    DOI： 10.3390/ma11020219 　

    ISSN： 1996-1944

  42. Epitaxial contact Andreev reflection spectroscopy of NbN/Co<inf>2</inf>FeSi layered devices Peer-reviewed

    Shigeta, I., Kubota, T., Sakuraba, Y., Molenaar, C.G., Beukers, J.N., Kimura, S., Golubov, A.A., Brinkman, A., Awaji, S., Takanashi, K., Hiroi, M.

    Applied Physics Letters　112　(7)　2018

    DOI： 10.1063/1.5007287 　

  43. Mn<inf>2</inf>VAl Heusler alloy thin films: Appearance of antiferromagnetism and exchange bias in a layered structure with Fe Peer-reviewed

    Tsuchiya, T., Kobayashi, R., Kubota, T., Saito, K., Ono, K., Ohhara, T., Nakao, A., Takanashi, K.

    Journal of Physics D: Applied Physics　51　(6)　2018

    DOI： 10.1088/1361-6463/aaa41a 　

  44. Deposition temperature dependence of interface magnetism of Co<inf>2</inf>FeGe-Heusler-alloy/Ag films studied with 57Fe Mössbauer spectroscopy Peer-reviewed

    Nakatani, N., Imai, S., Tanaka, M.A., Kubota, T., Takanashi, K., Mibu, K.

    Journal of Magnetism and Magnetic Materials　464　71-75　2018

    DOI： 10.1016/j.jmmm.2018.05.049 　

  45. 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

  46. Transport properties of epitaxial films for superconductor NbN and half-metallic Heusler alloy Co<inf>2</inf>MnSi under high magnetic fields Peer-reviewed

    Shigeta, I., Kubota, T., Sakuraba, Y., Kimura, S., Awaji, S., Takanashi, K., Hiroi, M.

    Physica B: Condensed Matter　536　310-313　2018

    DOI： 10.1016/j.physb.2017.09.074 　

    ISSN： 0921-4526

  47. Buffer layer dependence of magnetoresistance effects in Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si/MgO/Co<inf>50</inf>Fe<inf>50</inf> tunnel junctions Peer-reviewed

    Sun, M., Kubota, T., Takahashi, S., Kawato, Y., Sonobe, Y., Takanashi, K.

    AIP Advances　8　(5)　2018

    DOI： 10.1063/1.5007766 　

    ISSN： 2158-3226

  48. Optimization of half-Heusler PtMnSb alloy films for spintronic device applications Peer-reviewed

    Wen, Z., Kubota, T., Takanashi, K.

    Journal of Physics D: Applied Physics　51　(43)　2018

    DOI： 10.1088/1361-6463/aadf4e 　

    ISSN： 0022-3727

  49. Buffer layer dependence of magnetoresistance effects in Co2Fe0.4Mn0.6Si/MgO/Co50Fe50 tunnel junctions Peer-reviewed

    Mingling Sun, Takahide Kubota, Shigeki Takahashi, Yoshiaki Kawato, Yoshiaki Sonobe, Koki Takanashi

    AIP Advances　8　(5)　055902-1-055902-5　2017/12/04

    DOI： 10.1063/1.5007766 　

    ISSN： 2158-3226

  50. 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　(44)　443001-1-443001-14　2017/09/27

    DOI： 10.1088/1361-6463/aa88f4 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  51. Voltage control of magnetic anisotropy in epitaxial Ru/Co 2 FeAl/MgO heterostructures Peer-reviewed

    Wen, Z., Sukegawa, H., Seki, T., Kubota, T., Takanashi, K., Mitani, S.

    Scientific Reports　7　2017

    DOI： 10.1038/srep45026 　

  52. Nonlinear electric field effect on perpendicular magnetic anisotropy in Fe/MgO interfaces Peer-reviewed

    Xiang, Q., Wen, Z., Sukegawa, H., Kasai, S., Seki, T., Kubota, T., Takanashi, K., Mitani, S.

    Journal of Physics D: Applied Physics　50　(40)　40LT04-40LT04　2017

    DOI： 10.1088/1361-6463/aa87ab 　

    ISSN： 0022-3727

    eISSN： 1361-6463

  53. Fabrication and characterization of epitaxial films of superconductor NbN and highly spin-polarized heusler alloy Co<inf>2</inf>2Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si Peer-reviewed

    Shigeta, I., Kubota, T., Makise, K., Kimura, S., Awaji, S., Shinozaki, B., Koyama, K., Takanashi, K., Hiroi, M.

    IEEE Magnetics Letters　8　2017

    DOI： 10.1109/LMAG.2017.2687878 　

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

    Hirohata, A., Huminiuc, T., Sinclair, J., Wu, H., Samiepour, M., Vallejo-Fernandez, G., O'Grady, K., Balluf, J., Meinert, M., Reiss, G., Simon, E., Khmelevskyi, S., Szunyogh, L., Díaz, R.Y., Nowak, U., Tsuchiya, T., Sugiyama, T., Kubota, T., Takanashi, K., Inami, N., Ono, K.

    Journal of Physics D: Applied Physics　50　(44)　2017

    DOI： 10.1088/1361-6463/aa88f4 　

  55. Current perpendicular-to-plane giant magnetoresistance devices using half-metallic Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si electrodes and a Ag-Mg spacer Peer-reviewed

    Kubota, T., Ina, Y., Tsujikawa, M., Morikawa, S., Narisawa, H., Wen, Z., Shirai, M., Takanashi, K.

    Journal of Physics D: Applied Physics　50　(1)　2017

    DOI： 10.1088/1361-6463/50/1/014004 　

  56. Dual-spacer nanojunctions exhibiting large current-perpendicular-to-plane giant magnetoresistance for ultrahigh density magnetic recording Peer-reviewed

    Wen, Z., Kubota, T., Ina, Y., Takanashi, K.

    Applied Physics Letters　110　(10)　102401-102401　2017

    DOI： 10.1063/1.4977948 　

  57. Buffer-Layer Dependence of Interface Magnetic Anisotropy in Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si Heusler Alloy Ultrathin Films Peer-reviewed

    Sun, M., Kubota, T., Kawato, Y., Takahashi, S., Tsukamoto, A., Sonobe, Y., Takanashi, K.

    IEEE Transactions on Magnetics　53　(11)　1-4　2017

    DOI： 10.1109/TMAG.2017.2728627 　

  58. 19pBC-13 Differential conductance properties for fully-epitaxial junctions of Heusler alloy Co_2FeSi and superconductor NbN

    Shigeta I., Kubota T., Sakuraba Y., Molenaar C. G., Beukers J. N., Kimura S., Golubov A. A., Brinkman A., Koyama K., Awaji S., Takanashi K., Hiroi M.

    Meeting Abstracts of the Physical Society of Japan　71　1126-1126　2016

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.71.1.0_1126 　

    ISSN： 2189-079X

  59. Magnetic and transport properties of half-metallic Heusler alloy Co2FexMn1-xSi/ superconductor NbN thin films

    Shigeta Iduru, Kubota Takahide, Makise Kazumasa, Kimura Shojiro, Awaji Satoshi, Shinozaki Bunju, Terada Norio, Koyama Keiichi, Takanashi Koki, Hiroi Masahiko

    Meeting Abstracts of the Physical Society of Japan　71　874-874　2016

    Publisher: The Physical Society of Japan

    DOI： 10.11316/jpsgaiyo.71.2.0_874 　

  60. Interface magnetic anisotropy of Pd/Co<inf>2</inf>Fe<inf>x</inf>Mn<inf>1-x</inf>Si/MgO layered structures Peer-reviewed

    Kubota, T., Kamada, T., Kim, J., Tsukamoto, A., Takahashi, S., Sonobe, Y., Takanashi, K.

    Materials Transactions　57　(6)　773-776　2016

    DOI： 10.2320/matertrans.ME201505 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  61. Unconventional drop in the electrical resistance of chromium metal thin films at low temperature Peer-reviewed

    Ohashi, M., Ohashi, K., Sawabu, M., Miyagawa, M., Kubota, T., Takanashi, K.

    Physics Letters, Section A: General, Atomic and Solid State Physics　380　(38)　3133-3137　2016

    DOI： 10.1016/j.physleta.2016.07.031 　

  62. Parameter-free determination of the exchange constant in thin films using magnonic patterning Peer-reviewed

    Langer, M., Wagner, K., Sebastian, T., Hübner, R., Grenzer, J., Wang, Y., Kubota, T., Schneider, T., Stienen, S., Lenz, K., Schultheiß, H., Lindner, J., Takanashi, K., Arias, R.E., Fassbender, J.

    Applied Physics Letters　108　(10)　2016

    DOI： 10.1063/1.4943228 　

  63. Modelling of the Peltier effect in magnetic multilayers Peer-reviewed

    Juarez-Acosta, I., Olivares-Robles, M.A., Bosu, S., Sakuraba, Y., Kubota, T., Takahashi, S., Takanashi, K., Bauer, G.E.W.

    Journal of Applied Physics　119　(7)　2016

    DOI： 10.1063/1.4942163 　

  64. Exchange bias effects in Heusler alloy Ni<inf>2</inf>MnAl/Fe bilayers Peer-reviewed

    Tsuchiya, T., Kubota, T., Sugiyama, T., Huminiuc, T., Hirohata, A., Takanashi, K.

    Journal of Physics D: Applied Physics　49　(23)　2016

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

  65. Enhanced current-perpendicular-to-plane giant magnetoresistance effect in half-metallic NiMnSb based nanojunctions with multiple Ag spacers Peer-reviewed

    Wen, Z., Kubota, T., Yamamoto, T., Takanashi, K.

    Applied Physics Letters　108　(23)　2016

    DOI： 10.1063/1.4953403 　

  66. Current perpendicular to film plane type giant magnetoresistance effect using a Ag-Mg spacer and Co&lt;inf&gt;2&lt;/inf&gt;Fe&lt;inf&gt;0.4&lt;/inf&gt;Mn&lt;inf&gt;0.6&lt;/inf&gt;Si Heusler alloy electrodes Peer-reviewed

    Hiroyuki Narisawa, Takahide Kubota, Koki Takanashi

    Applied Physics Express　8　(6)　2015/06/01

    Publisher: Japan Society of Applied Physics

    DOI： 10.7567/APEX.8.063008 　

    ISSN： 1882-0786 1882-0778

  67. 19aPS-118 Superconducting properties of superconductor NbN/ferromagnetic Heusler alloy Co_2MnSi thin films

    Shigeta I., Kubota T., Makise K., Kimura S., Awaji S., Koyama K., Shinozaki B., Takanashi K., Hiroi M.

    Meeting Abstracts of the Physical Society of Japan　70　1469-1469　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.2.0_1469 　

    ISSN： 2189-079X

  68. 23pAD-13 Spin polarization of half-metallic Heusler alloys by the Andreev reflection method in fully-epitaxial junctions

    Shigeta I., Kubota T., Sakuraba Y., Molenaar C. G., Beukers J. N., Kimura S., Golubov A. A., Brinkman A., Koyama K., Awaji S., Takanashi K., Hiroi M.

    Meeting Abstracts of the Physical Society of Japan　70　1208-1208　2015

    Publisher: The Physical Society of Japan (JPS)

    DOI： 10.11316/jpsgaiyo.70.1.0_1208 　

    ISSN： 2189-079X

  69. Reply to Comment on 'Current perpendicular to film plane type giant magnetoresistance effect using a Ag-Mg spacer and Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si Heusler alloy electrodes' [Appl. Phys. Express 8, 063008 (2015)] Peer-reviewed

    Narisawa, H., Kubota, T., Takanashi, K.

    Applied Physics Express　8　(11)　2015

    DOI： 10.7567/APEX.8.119102 　

  70. Anisotropic Magnetoresistance Effect in Co-2(Fe-Mn)(Al-Si) Heusler Alloy Thin Films. Peer-reviewed

    Yako, H., Kubota, T., Takanashi, K., IEEE

    2015 Ieee Magnetics Conference (Intermag)　2015

  71. Zero-field spin torque oscillation in Co<inf>2</inf>(Fe, Mn)Si with a point contact geometry Peer-reviewed

    Yamamoto, T., Seki, T., Kubota, T., Yako, H., Takanashi, K.

    Applied Physics Letters　106　(9)　2015

    DOI： 10.1063/1.4914375 　

  72. Structural, electronic, and magnetic properties of perpendicularly magnetised Mn<inf>2</inf>RhSn thin films Peer-reviewed

    Meshcheriakova, O., Köhler, A., Ouardi, S., Kondo, Y., Kubota, T., Chandra, S., Karel, J., Barbosa, C.V., Stinshoff, R., Sahoo, R., Ueda, S., Ikenaga, E., Mizukami, S., Chadov, S., Ebke, D., Fecher, G.H., Felser, C.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164008 　

  73. Spin torque-induced magnetization dynamics in giant magnetoresistance devices with Heusler alloy layers Peer-reviewed

    Seki, T., Yako, H., Yamamoto, T., Kubota, T., Sakuraba, Y., Ueda, M., Takanashi, K.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164010 　

  74. Size dependence of Peltier cooling in ferromagnet/Au nanopillars Peer-reviewed

    Bosu, S., Sakuraba, Y., Kubota, T., Juarez-Acosta, I., Sugiyama, T., Saito, K., Olivares-Robles, M.A., Takahashi, S., Bauer, G.E.W., Takanashi, K.

    Applied Physics Express　8　(8)　2015

    DOI： 10.7567/APEX.8.083002 　

  75. Material dependence of anomalous Nernst effect in perpendicularly magnetized ordered-alloy thin films Peer-reviewed

    Hasegawa, K., Mizuguchi, M., Sakuraba, Y., Kamada, T., Kojima, T., Kubota, T., Mizukami, S., Miyazaki, T., Takanashi, K.

    Applied Physics Letters　106　(25)　2015

    DOI： 10.1063/1.4922901 　

  76. Magnetic dichroism study on Mn<inf>1.8</inf>Co<inf>1.2</inf>Ga thin film using a combination of x-ray absorption and photoemission spectroscopy Peer-reviewed

    Ouardi, S., Fecher, G.H., Kubota, T., Mizukami, S., Ikenaga, E., Nakamura, T., Felser, C.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164007 　

  77. Magnetic damping constant in Co-based full heusler alloy epitaxial films Peer-reviewed

    Oogane, M., Kubota, T., Naganuma, H., Ando, Y.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164012 　

  78. Impact of local order and stoichiometry on the ultrafast magnetization dynamics of Heusler compounds Peer-reviewed

    Steil, D., Schmitt, O., Fetzer, R., Kubota, T., Naganuma, H., Oogane, M., Ando, Y., Rodan, S., Blum, C.G.F., Balke, B., Wurmehl, S., Aeschlimann, M., Cinchetti, M.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164016 　

  79. Fully epitaxial C1<inf>b</inf>-type NiMnSb half-Heusler alloy films for current-perpendicular-to-plane giant magnetoresistance devices with a Ag spacer Peer-reviewed

    Wen, Z., Kubota, T., Yamamoto, T., Takanashi, K.

    Scientific Reports　5　2015

    DOI： 10.1038/srep18387 　

  80. Erratum: Forward scattering in hard X-ray photoelectron spectroscopy: Structural investigation of buried Mn-Ga films (Appl. Phys. Lett. (2015) 106 (052402)) Peer-reviewed

    Violbarbosa, C.E., Ouardi, S., Kubota, T., Mizukami, S., Fecher, G.H., Miyazaki, T., Ikenaga, E., Felser, C.

    Applied Physics Letters　106　(14)　2015

    DOI： 10.1063/1.4917272 　

  81. Forward scattering in hard X-ray photoelectron spectroscopy: Structural investigation of buried Mn-Ga films Peer-reviewed

    Violbarbosa, C.E., Ouardi, S., Kubota, T., Mizukami, S., Fecher, G.H., Miyazaki, T., Ikenaga, E., Felser, C.

    Applied Physics Letters　106　(5)　2015

    DOI： 10.1063/1.4907537 　

  82. Direct measurement of the magnetic anisotropy field in Mn-Ga and Mn-Co-Ga Heusler films Peer-reviewed

    Fowley, C., Ouardi, S., Kubota, T., Yildirim, O., Neudert, A., Lenz, K., Sluka, V., Lindner, J., Law, J.M., Mizukami, S., Fecher, G.H., Felser, C., Deac, A.M.

    Journal of Physics D: Applied Physics　48　(16)　2015

    DOI： 10.1088/0022-3727/48/16/164006 　

  83. Erratum: Current perpendicular to film plane type giant magnetoresistance effect using a Ag-Mg spacer and Co<inf>2</inf>Fe<inf>0.4</inf>Mn<inf>0.6</inf>Si Heusler alloy electrodes (Applied Physics Express (2015) 8 (063008)) Peer-reviewed

    Narisawa, H., Kubota, T., Takanashi, K.

    Applied Physics Express　8　(11)　2015

    DOI： 10.7567/APEX.8.119201 　

  84. Anisotropic Magnetoresistance Effect in Co<inf>2</inf>(Fe-Mn)(Al-Si) Heusler Alloy Thin Film Peer-reviewed

    Yako, H., Kubota, T., Takanashi, K.

    IEEE Transactions on Magnetics　51　(11)　2015

    DOI： 10.1109/TMAG.2015.2439284 　

  85. Ultrafast magnetization dynamics in Co-based Heusler compounds with tuned chemical ordering Peer-reviewed

    Steil, D., Schmitt, O., Fetzer, R., Kubota, T., Naganuma, H., Oogane, M., Ando, Y., K Suszka, A., Idigoras, O., Wolf, G., Hillebrands, B., Berger, A., Aeschlimann, M., Cinchetti, M.

    New Journal of Physics　16　2014

    DOI： 10.1088/1367-2630/16/6/063068 　

  86. Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal and cubic Mn-Co-Ga Heusler alloy electrode Peer-reviewed

    Kubota, T., Mizukami, S., Ma, Q.L., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　115　(17)　2014

    DOI： 10.1063/1.4855016 　

  87. Static and dynamic magnetic properties of cubic Mn-Co-Ga Heusler films Peer-reviewed

    Demiray, A.S., Kubota, T., Iihama, S., Mizukami, S., Miyazaki, T., Naganuma, H., Oogane, M., Ando, Y.

    Journal of Applied Physics　115　(17)　2014

    DOI： 10.1063/1.4864250 　

  88. Spin-dependent transport behavior in C<inf>60</inf> and Alq<inf>3</inf> based spin valves with a magnetite electrode (invited) Peer-reviewed

    Zhang, X., Mizukami, S., Ma, Q., Kubota, T., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　115　(17)　2014

    DOI： 10.1063/1.4870154 　

  89. Perpendicular magnetic anisotropy of Co<inf>2</inf>Fe<inf>x</inf>Mn<inf>1-x</inf>Si Heusler alloy ultra-thin films Peer-reviewed

    Kamada, T., Kubota, T., Takahashi, S., Sonobe, Y., Takanashi, K.

    IEEE Transactions on Magnetics　50　(11)　2014

    DOI： 10.1109/TMAG.2014.2322857 　

    ISSN： 0018-9464

    eISSN： 1941-0069

  90. Non-gilbert-damping mechanism in a ferromagnetic Heusler compound probed by nonlinear spin dynamics Peer-reviewed

    Pirro, P., Sebastian, T., Brächer, T., Serga, A.A., Kubota, T., Naganuma, H., Oogane, M., Ando, Y., Hillebrands, B.

    Physical Review Letters　113　(22)　2014

    DOI： 10.1103/PhysRevLett.113.227601 　

  91. Magnetization dynamics for L 1<inf>0</inf> MnGa/Fe exchange coupled bilayers Peer-reviewed

    Mizukami, S., Kubota, T., Iihama, S., Ranjbar, R., Ma, Q., Zhang, X., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　115　(17)　2014

    DOI： 10.1063/1.4868087 　

  92. Investigation of the Mn<inf>3-Δ</inf>Ga/MgO interface for magnetic tunneling junctions Peer-reviewed

    Violbarbosa, C.E., Ouardi, S., Kubota, T., Mizukami, S., Fecher, G.H., Miyazaki, T., Kozina, X., Ikenaga, E., Felser, C.

    Journal of Applied Physics　116　(3)　2014

    DOI： 10.1063/1.4890582 　

  93. Abrupt transition from ferromagnetic to antiferromagnetic of interfacial exchange in perpendicularly magnetized L10 -MnGa/FeCo tuned by fermi level position Peer-reviewed

    Ma, Q.L., Mizukami, S., Kubota, T., Zhang, X.M., Ando, Y., Miyazaki, T.

    Physical Review Letters　112　(15)　2014

    DOI： 10.1103/PhysRevLett.112.157202 　

  94. Tetragonal D0

    Mizukami Shigemi, Sakuma Akimasa, Sugihara Atsushi, Kubota Takahide, Kondo Yukio, Tsuchiura Hiroki, Miyazaki Terunobu

    Applied Physics Express　6　(12)　123002-123002-4　2013/12/25

    Publisher: The Japan Society of Applied Physics

    DOI： 10.7567/APEX.6.123002 　

    ISSN： 1882-0778

    More details Close

    First-principles calculation of D0<inf>22</inf>Mn<inf>3</inf>Ge shows a fully spin-polarized \Delta_{1} band at the Fermi level, low saturation magnetization M_{\text{S } }=180 emu/cm3, high uniaxial magnetic anisotropy K_{\text{u } }=23 Merg/cm3, and low Gilbert damping \alpha=9\times 10^{-4}. We also experimentally investigate D0<inf>22</inf>Mn<inf>3+x</inf>Ge epitaxial films grown on MgO(100) substrates with different compositions x. The films exhibit a coercivity of about 20 kOe, M_{\text{S } } of about 130 emu/cm3, and K_{\text{u } } of about 10 Merg/cm3at x=0.55 (78 at.% Mn). These indicate that D0<inf>22</inf>Mn<inf>3</inf>Ge is a good candidate for spin-transfer-torque random access memory.

  95. Tunneling magnetoresistance effect in MnGa based perpendicular magnetic tunnel junction with Fe/Co interlayer Peer-reviewed

    Ma, Q., Mizukami, S., Kubota, T., Zhang, X., Sugihara, A., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　114　(16)　2013

    DOI： 10.1063/1.4828483 　

  96. Tetragonal D022 Mn3+xGe epitaxial films grown on MgO(100) with a large perpendicular magnetic anisotropy Peer-reviewed

    Mizukami, S., Sakuma, A., Sugihara, A., Kubota, T., Kondo, Y., Tsuchiura, H., Miyazaki, T.

    Applied Physics Express　6　(12)　123002-123002-4　2013

    DOI： 10.7567/APEX.6.123002 　

    ISSN： 1882-0778

  97. Observation of a large spin-dependent transport length in organic Spin valves at room temperature Peer-reviewed

    Zhang, X., Mizukami, S., Kubota, T., Ma, Q., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    Nature Communications　4　2013

    DOI： 10.1038/ncomms2423 　

  98. Nonlinear emission of spin-wave caustics from an edge mode of a microstructured Co<inf>2</inf>Mn<inf>0.6</inf>Fe<inf>0.4</inf>Si waveguide Peer-reviewed

    Sebastian, T., Brächer, T., Pirro, P., Serga, A.A., Hillebrands, B., Kubota, T., Naganuma, H., Oogane, M., Ando, Y.

    Physical Review Letters　110　(6)　2013

    DOI： 10.1103/PhysRevLett.110.067201 　

  99. Magnetoresistance enhancement in Mn<inf>x</inf>Ga <inf>100 - X</inf>/MgO/CoFeB perpendicular magnetic tunnel junctions by using CoFeB interlayer Peer-reviewed

    Ma, Q.L., Kubota, T., Mizukami, S., Zhang, X.M., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    IEEE Transactions on Magnetics　49　(7)　4339-4342　2013

    DOI： 10.1109/TMAG.2013.2242861 　

  100. Magnetic tunnel junctions of perpendicularly magnetized L1<inf>0</inf>-MnGa/Fe/MgO/CoFe structures: Fe-layer-thickness dependences of magnetoresistance effect and tunnelling conductance spectra Peer-reviewed

    Kubota, T., Ma, Q.L., Mizukami, S., Zhang, X.M., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Journal of Physics D: Applied Physics　46　(15)　2013

    DOI： 10.1088/0022-3727/46/15/155001 　

  101. Magnetic properties of L1<inf>0</inf>-Mn<inf>57</inf>Ga<inf>43</inf>/Co bilayer films with different Co thicknesses Peer-reviewed

    Ranjbar, R., Mizukami, S., Ando, Y., Kubota, T., Ma, Q.L., Zhang, X.M., Miyazaki, T.

    Journal of Magnetism and Magnetic Materials　346　53-57　2013

    DOI： 10.1016/j.jmmm.2013.07.008 　

  102. Interface tailoring effect on magnetic properties and their utilization in MnGa-based perpendicular magnetic tunnel junctions Peer-reviewed

    Ma, Q.L., Kubota, T., Mizukami, S., Zhang, X.M., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Physical Review B - Condensed Matter and Materials Physics　87　(18)　2013

    DOI： 10.1103/PhysRevB.87.184426 　

  103. Fast magnetization precession for perpendicularly magnetized MnAlGe epitaxial films with atomic layered structures Peer-reviewed

    Mizukami, S., Sakuma, A., Kubota, T., Kondo, Y., Sugihara, A., Miyazaki, T.

    Applied Physics Letters　103　(14)　2013

    DOI： 10.1063/1.4824031 　

  104. Anomalous nernst effect in L1<inf>0</inf>-FePt/MnGa thermopiles for new thermoelectric applications Peer-reviewed

    Sakuraba, Y., Hasegawa, K., Mizuguchi, M., Kubota, T., Mizukami, S., Miyazaki, T., Takanashi, K.

    Applied Physics Express　6　(3)　2013

    DOI： 10.7567/APEX.6.033003 　

  105. Stoichiometry dependent phase transition in Mn-Co-Ga-based thin films: From cubic in-plane, soft magnetized to tetragonal perpendicular, hard magnetized Peer-reviewed

    Ouardi, S., Kubota, T., Fecher, G.H., Stinshoff, R., Mizukami, S., Miyazaki, T., Ikenaga, E., Felser, C.

    Applied Physics Letters　101　(24)　2012

    DOI： 10.1063/1.4770303 　

  106. Magnetoresistance effect in L1 <inf>0</inf>-MnGa/MgO/CoFeB perpendicular magnetic tunnel junctions with Co interlayer Peer-reviewed

    Ma, Q.L., Kubota, T., Mizukami, S., Zhang, X.M., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Applied Physics Letters　101　(3)　2012

    DOI： 10.1063/1.4737000 　

  107. Low-damping spin-wave propagation in a micro-structured Co <inf>2</inf>Mn <inf>0.6</inf>Fe <inf>0.4</inf>Si Heusler waveguide Peer-reviewed

    Sebastian, T., Ohdaira, Y., Kubota, T., Pirro, P., Brächer, T., Vogt, K., Serga, A.A., Naganuma, H., Oogane, M., Ando, Y., Hillebrands, B.

    Applied Physics Letters　100　(11)　2012

    DOI： 10.1063/1.3693391 　

  108. Large change of perpendicular magnetic anisotropy in Cobalt ultrathin film induced by varying capping layers Peer-reviewed

    Zhang, X., Mizukami, S., Kubota, T., Ma, Q., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　111　(7)　2012

    DOI： 10.1063/1.3676240 　

  109. Fabrication of L1 <inf>0</inf>-MnAl perpendicularly magnetized thin films for perpendicular magnetic tunnel junctions Peer-reviewed

    Hosoda, M., Oogane, M., Kubota, M., Kubota, T., Saruyama, H., Iihama, S., Naganuma, H., Ando, Y.

    Journal of Applied Physics　111　(7)　2012

    DOI： 10.1063/1.3676428 　

    ISSN： 0021-8979

    eISSN： 1089-7550

  110. Effect of Mg interlayer on perpendicular magnetic anisotropy of CoFeB films in MgO/Mg/CoFeB/Ta structure Peer-reviewed

    Ma, Q.L., Iihama, S., Kubota, T., Zhang, X.M., Mizukami, S., Ando, Y., Miyazaki, T.

    Applied Physics Letters　101　(12)　2012

    DOI： 10.1063/1.4754118 　

  111. Dependence of tunnel magnetoresistance effect on fe thickness of perpendicularly magnetized L1 <inf>0</inf>-Mn <inf>62</inf>Ga <inf>38</inf>/Fe/MgO/ CoFe junctions Peer-reviewed

    Kubota, T., Ma, Q., Mizukami, S., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Applied Physics Express　5　(4)　2012

    DOI： 10.1143/APEX.5.043003 　

  112. Damping of magnetization precession in perpendicularly magnetized CoFeB alloy thin films Peer-reviewed

    Iihama, S., Ma, Q., Kubota, T., Mizukami, S., Ando, Y., Miyazaki, T.

    Applied Physics Express　5　(8)　3-3　2012

    DOI： 10.1143/APEX.5.083001 　

  113. Composition dependence of magnetic properties in perpendicularly magnetized epitaxial thin films of Mn-Ga alloys Peer-reviewed

    Mizukami, S., Kubota, T., Wu, F., Zhang, X., Miyazaki, T., Naganuma, H., Oogane, M., Sakuma, A., Ando, Y.

    Physical Review B - Condensed Matter and Materials Physics　85　(1)　2012

    DOI： 10.1103/PhysRevB.85.014416 　

  114. Annealing temperature and Co layer thickness dependence of magnetoresistance effect for L1 <inf>0</inf>-MnGa/Co/MgO/CoFeB perpendicular magnetic tunnel junctions Peer-reviewed

    Ma, Q.L., Kubota, T., Mizukami, S., Zhang, X.M., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    IEEE Transactions on Magnetics　48　(11)　2808-2811　2012

    DOI： 10.1109/TMAG.2012.2196420 　

  115. Magnetoresistance Effect in Co2MnSi/semimetallic-Fe2VAl/CoFe Junctions Peer-reviewed

    T Kubota, M Oogane, S Mizukami, H Naganuma, Y Ando, T Miyazaki

    Journal ofPhysics:ConferenceSeries　266　012096-1-012096-5　2011/01/28

    DOI： 10.1088/1742-6596/266/1/012096 　

    ISSN： 1742-6588

  116. Time-resolved kerr effect in very thin films of CoCrPt alloys Peer-reviewed

    Mizukami, S., Watanabe, D., Kubota, T., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    IEEE Transactions on Magnetics　47　(10)　3897-3900　2011

    DOI： 10.1109/TMAG.2011.2154357 　

  117. Spin transport in Co/Al<inf>2</inf>O<inf>3</inf>/Alq<inf>3</inf>/Co organic spin valve Peer-reviewed

    Zhang, X., Mizukami, S., Kubota, T., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    IEEE Transactions on Magnetics　47　(10)　2649-2651　2011

    DOI： 10.1109/TMAG.2011.2143392 　

  118. Quadratic magneto-optical Kerr effect in Co<inf>2</inf>MnSi Peer-reviewed

    Wolf, G., Hamrle, J., Trudel, S., Kubota, T., Ando, Y., Hillebrands, B.

    Journal of Applied Physics　110　(4)　2011

    DOI： 10.1063/1.3622512 　

  119. Magnetoresistance effect in tunnel junctions with perpendicularly magnetized D0<inf>22</inf>-Mn<inf>3-δ</inf>Ga electrode and MgO barrier Peer-reviewed

    Kubota, T., Miura, Y., Watanabe, D., Mizukami, S., Wu, F., Naganuma, H., Zhang, X., Oogane, M., Shirai, M., Ando, Y., Miyazaki, T.

    Applied Physics Express　4　(4)　2011

    DOI： 10.1143/APEX.4.043002 　

  120. Long-lived ultrafast spin precession in manganese alloys films with a large perpendicular magnetic anisotropy Peer-reviewed

    Mizukami, S., Wu, F., Sakuma, A., Walowski, J., Watanabe, D., Kubota, T., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Physical Review Letters　106　(11)　2011

    DOI： 10.1103/PhysRevLett.106.117201 　

  121. Interface effects on perpendicular magnetic anisotropy for molecular-capped cobalt ultrathin films Peer-reviewed

    Zhang, Xianmin, Mizukami, Shigemi, Kubota, Takahide, Oogane, Mikihiko, Naganuma, Hiroshi, Ando, Yasuo, Miyazaki, Terunobu

    Applied Physics Letters　99　(16)　2011

    DOI： 10.1063/1.3651766 　

  122. Interface effects on perpendicular magnetic anisotropy for molecular-capped cobalt ultrathin films Peer-reviewed

    Zhang, X., Mizukami, S., Kubota, T., Oogane, M., Naganuma, H., Ando, Y., Miyazaki, T.

    Applied Physics Letters　99　(16)　2011

    DOI： 10.1063/1.3651766 　

  123. Influence of Pt doping on Gilbert damping in permalloy films and comparison with the perpendicularly magnetized alloy films Peer-reviewed

    Mizukami, S., Kubota, T., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Japanese Journal of Applied Physics　50　(10 PART 1)　2011

    DOI： 10.1143/JJAP.50.103003 　

  124. Gilbert damping in Ni/Co multilayer films exhibiting large perpendicular anisotropy Peer-reviewed

    Mizukami, S., Zhang, X., Kubota, T., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Applied Physics Express　4　(1)　2011

    DOI： 10.1143/APEX.4.013005 　

  125. Effect of metallic Mg insertion on the magnetoresistance effect in MgO-based tunnel junctions using D0<inf>22</inf>-Mn<inf>3-δ</inf>Ga perpendicularly magnetized spin polarizer Peer-reviewed

    Kubota, T., Mizukami, S., Watanabe, D., Wu, F., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Journal of Applied Physics　110　(1)　2011

    DOI： 10.1063/1.3603034 　

  126. Ultrafast Demagnetization for Ni80Fe20 and Half-metallic Co2MnSi Heusler Alloy Films Peer-reviewed

    S. Tsunegi, T. Kubota, M. Oogane, D. Watanabe, H. Naganuma, Y. Ando, T. Miyazaki

    Journal of Physics: Conference Series　200　042017-1-042017-4　2010/04

    DOI： 10.1088/1742-6596/200/4/042017 　

    ISSN： 1742-6588

  127. Element-Specific Evaluation of Magnetic Moments in Ferrimagnetic Mn2Val Heusler Epitaxial Thin Films Peer-reviewed

    T.Kubota, K. Kodama, T. Nakamura, Y. Sakuraba, M. Oogane, H. Naganuma, K. Takanashi, Y. Ando

    J. Magn. Soc. Jpn.　34　(2)　100-106　2010/03

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.1002R0004 　

    ISSN： 1882-2924

    More details Close

    We successfully fabricated L21-ordered Mn2VAl Heusler thin films and evaluated their ferrimagnetic properties by soft x-ray magnetic circular dichroism (XMCD). The buffer layers and annealing temperatures were varied to prepare the Mn2VAl films. We discovered that Mn2VAl could be ordered in an L21 phase well when it was deposited directly onto an MgO (001) single crystalline substrate. The maximum values of L21 and B2 long-range order parameters we obtained were about 0.5 for both phases for samples without a buffer layer, when substrates were heated at 500°C or 600°C. The saturation magnetization (Ms) for these samples was roughly 150 emu/cc. This is rather small compared to that expected from the ideal Slater-Pauling behavior, which might be due to the suppressed degree of L21 or B2 ordering. Ferrimagnetism in the Mn2VAl, ferrimagnetic coupling between Mn and V moments was clearly observed by using the XMCD technique in well-ordered L21-Mn2VAl film as has been predicted in theoretical investigations.

  128. Note: Probing quadratic magneto-optical Kerr effects with a dual-beam system Peer-reviewed

    Trudel, S., Wolf, G., Schulthei, H., Hamrle, J., Hillebrands, B., Kubota, T., Ando, Y.

    Review of Scientific Instruments　81　(2)　2010

    DOI： 10.1063/1.3276715 　

  129. Laser-induced fast magnetization precession and gilbert damping for CoCrPt alloy thin films with perpendicular magnetic anisotropy Peer-reviewed

    Mizukami, S., Watanabe, D., Kubota, T., Zhang, X., Naganuma, H., Oogane, M., Ando, Y., Miyazaki, T.

    Applied Physics Express　3　(12)　2010

    DOI： 10.1143/APEX.3.123001 　

  130. Gilbert magnetic damping constant of epitaxially grown Co-based Heusler alloy thin films Peer-reviewed

    Oogane, M., Kubota, T., Kota, Y., Mizukami, S., Naganuma, H., Sakuma, A., Ando, Y.

    Applied Physics Letters　96　(25)　2010

    DOI： 10.1063/1.3456378 　

  131. Fabrication of perpendicularly magnetized magnetic tunnel junctions with [formula omitted] hybrid electrode Peer-reviewed

    Hiratsuka, T., Kim, G., Sakuraba, Y., Kubota, T., Kodama, K., Inami, N., Naganuma, H., Oogane, M., Nakamura, T., Takanashi, K., Ando, Y.

    Journal of Applied Physics　107　(9)　2010

    DOI： 10.1063/1.3358239 　

  132. Evidence of Fermi level control in a half-metallic Heusler compound Co <inf>2</inf> MnSi by Al-doping: Comparison of measurements with first-principles calculations Peer-reviewed

    Sakuraba, Y., Takanashi, K., Kota, Y., Kubota, T., Oogane, M., Sakuma, A., Ando, Y.

    Physical Review B - Condensed Matter and Materials Physics　81　(14)　2010

    DOI： 10.1103/PhysRevB.81.144422 　

  133. Band-structure-dependent demagnetization in the Heusler alloy Co <inf>2</inf>Mn<inf>1-x</inf>Fe<inf>x</inf>Si Peer-reviewed

    Steil, D., Alebrand, S., Roth, T., Krauß, M., Kubota, T., Oogane, M., Ando, Y., Schneider, H.C., Aeschlimann, M., Cinchetti, M.

    Physical Review Letters　105　(21)　2010

    DOI： 10.1103/PhysRevLett.105.217202 　

  134. Magnetic Damping Constant of Co2FeMnSi Heusler Alloy Thin Films Peer-reviewed

    M. Oogane, T. Kubota, N. Hirose, Y, Ando

    J. Magn. Soc. Jpn　33　(3)　270-273　2009

    Publisher: The Magnetics Society of Japan

    DOI： 10.3379/msjmag.0903RE8063 　

    ISSN： 1882-2924

    More details Close

    Magnetic damping constants of Co2FexMn1-xSi (x = 0.0 - 1.0) Heusler alloy thin films have been investigated. Co2FexMn1-xSi thin films were epitaxitially grown on the single crystal MgO(100) substrate using magnetron sputtering technique. Damping constants were estimated by analyzing the line width of ferromagnetic resonance (FMR) spectra. Damping constant of Co2FexMn1-xSi films showed a minimum value of 0.003 at x = 0.4. This damping constant is very small compared with other ferromagnetic metals. Additionally, damping constants significantly increased above x = 0.6. In this article, the relationship between the damping constant and the half-metallicity of Co2FexMn1-xSi films is discussed.

  135. Structure, exchange stiffness, and magnetic anisotropy of Co <inf>2</inf>MnAl<inf>x</inf>Si<inf>1-x</inf> Heusler compounds Peer-reviewed

    Kubota, T., Hamrle, J., Sakuraba, Y., Gaier, O., Oogane, M., Sakuma, A., Hillebrands, B., Takanashi, K., Ando, Y.

    Journal of Applied Physics　106　(11)　113907　2009

    DOI： 10.1063/1.3265428 　

  136. Ferrimagnetism in epitaxially grown Mn<inf>2</inf> VAl Heusler alloy investigated by means of soft x-ray magnetic circular dichroism Peer-reviewed

    Kubota, T., Kodama, K., Nakamura, T., Sakuraba, Y., Oogane, M., Takanashi, K., Ando, Y.

    Applied Physics Letters　95　(22)　222503　2009

    DOI： 10.1063/1.3269609 　

  137. Electronic properties of Co<inf>2</inf>MnSi thin films studied by hard x-ray photoelectron spectroscopy Peer-reviewed

    Ouardi, S., Gloskovskii, A., Balke, B., Jenkins, C.A., Barth, J., Fecher, G.H., Felser, C., Gorgoi, M., Mertin, M., Schäfers, F., Ikenaga, E., Yang, K., Kobayashi, K., Kubota, T., Oogane, M., Ando, Y.

    Journal of Physics D: Applied Physics　42　(8)　2009

    DOI： 10.1088/0022-3727/42/8/084011 　

  138. Tunneling spin polarization and magnetic properties of Co-Fe-B alloys and their dependence on boron content Peer-reviewed

    Kubota, T., Daibou, T., Oogane, M., Ando, Y., Miyazaki, T.

    Japanese Journal of Applied Physics, Part 2: Letters　46　(8-11)　L250-L252　2007

    DOI： 10.1143/JJAP.46.L250 　

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Misc. 15

  1. Ordered Alloys in Spintronics Invited

    KUBOTA Takahide, Takanashi Koki

    The journal of The Institute of Electrical Engineers of Japan　139　(9)　607-612　2019/09

  2. Progress of Spintronic Materials Based on Ordered Alloys Invited

    TAKANASHI Koki, SEKI Takeshi, KUBOTA Takahide, ITO Keita

    Function& Materials　38　(8)　48-58　2018/08

  3. Exchange bias using antiferromagnetic Heusler alloy films

    KUBOTA Takahide, TSHUCHIYA Tomoki, ITO Keita, SUGIYAMA Tomoko, TAKEDA Yukiharu, SAITOH Yuji, KIMURA Akio, TAKANASHI Koki

    IEICE Technical Report　MRIS2018　(8)　43-47　2018/07

  4. Transport properties of half-metallic Heusler alloy Co2Fe0.4Mn0.6Si/superconductor NbN thin films under high magnetic fields

    Shigeta Iduru, Kubota Takahide, Kimura Shojiro, Awaji Satoshi, Takanashi Koki, Hiroi Masahiko

    Meeting Abstracts of the Physical Society of Japan　73　(0)　1136-1136　2018

    Publisher: 一般社団法人 日本物理学会

  5. The effect of superconducting fluctuations of half-metallic Heusler alloy Co2Fe0.4Mn0.6Si/superconductor NbN thin films

    Shigeta Iduru, Matsuoka Shogo, Kubota Takahide, Shinozaki Bunju, Takanashi Koki, Hiroi Masahiko

    Meeting Abstracts of the Physical Society of Japan　73　(0)　579-579　2018

    Publisher: 一般社団法人 日本物理学会

  6. A2構造Mn2VAlの磁性とFe積層膜における交換磁気異方性の熱処理条件依存性

    土屋朋生, 小林亮太, 窪田崇秀, 斉藤耕太郎, 小野寛太, 大原高志, 中尾朗子, 高梨弘毅

    日本金属学会講演概要(CD-ROM)　161st　2017

    ISSN： 2433-3093

  7. 反強磁性ホイスラー合金Mn2VAlの中性子回折

    小野寛太, 斉藤耕太郎, 梅津理恵, 土屋朋生, 窪田崇秀, 大原高志, 中尾朗子, 高梨弘毅

    日本金属学会講演概要(CD-ROM)　161st　2017

    ISSN： 2433-3093

  8. Development of new antiferromagnetic materials -Recent research in Europe

    廣畑 貴文, テオドア ヒュミニウック, ジョン シンクレア, ハオカイフェン ウー, マージャン サミエプール, ゴンザロ ヴァレジョ, フェルナンデス, ケヴィン オグレディ, ギュンター ライス, ラズロ シニョック, ウルリッヒ ノヴァク, 窪田 崇秀, 高梨 弘毅, 井波 暢人, 小野 寛太

    日本磁気学会第209回研究会資料　209　1-6　2016/10/21

    Publisher: 公益社団法人 日本磁気学会

    ISSN： 1882-2940

  9. Fabrication and characterization of rare-metal-free, antiferromagnetic Heusler alloy thin films

    Koki Takanashi, Atsufumi Hirohata, Takahide Kubota

    日本磁気学会 第203回研究会資料　31-34　2015/06/29

  10. 規則合金スピントロニクス材料の最近の発展

    窪田崇秀, 関剛斎, 水口将輝, 高梨弘毅

    Institute of Electrical Engineers of Japan (IEEJ) The Papers of Technical Meeting on "Magnetics "　MAG-15-129-133　5-8　2015

  11. 10pBF-3 Transport properties of half-metallic Heusler alloy/superconductor fully-epitaxial trilayer films and junctions

    Shigeta I., Kubota T., Sakuraba Y., Kimura S., Awaji S., Koyama K., Takanashi K., Hiroi M.

    Meeting abstracts of the Physical Society of Japan　69　(2)　317-317　2014/08/22

    Publisher: The Physical Society of Japan (JPS)

    ISSN： 1342-8349

  12. 強磁性金属薄膜における熱磁気効果

    水口将輝, 長谷川浩太, 桜庭裕弥, 内田健一, 齋藤英治, 窪田崇秀, 水上成美, 宮崎照宣, 高梨弘毅

    日本磁気学会研究会資料　193rd　7-11　2013/12/17

    Publisher: 日本磁気学会

    ISSN： 1882-2940

  13. Elucidation of spin polarization characteristics of half-metallic materials by tunneling spectroscopy measurements under very low temperatures and strong magnetic fields

    68-70　2013

    Publisher: 東北大学金属材料研究所附属強磁場超伝導材料研究センター

  14. Half-metallic Heusler alloys with low magnetic damping

    OOGANE M, MIZUKAMI S, KUBOTA T, NAGANUMA H, ANDO Y

    日本磁気学会研究会資料 = Bulletin of Topical Symposium of the Magnetics Society of Japan　183　21-24　2012/03/22

    Publisher: 日本磁気学会

    ISSN： 1882-2940

  15. Fe-Co-Ni およびCo 基フルホイスラー合金薄膜における磁気緩和

    水上成美, 大兼幹彦, 窪田崇秀, 渡辺大輔, 永沼博, 安藤康夫, 宮﨑照宣

    まぐね　4　(5)　229-235　2009

    Publisher: 日本磁気学会

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Books and Other Publications 3

  1. スピントロニクスハンドブック : 基礎から応用まで

    スピントロニクスハンドブック編集委員会, 佐橋, 政司, 湯浅, 新治, 遠藤, 哲郎

    エヌ・ティー・エス　2023/05

    ISBN: 9784860438425

  2. Nanomagnetic materials : fabrication, characterization and application

    Atsufumi Hirohata, Kelvin Elphick, Takahide Kubota, Koki Takanashi

    Elsevier　2021

    ISBN: 9780128223499

  3. Novel Structured Metallic and Inorganic Materials

    KUBOTA Takahide, SEKI Takeshi, TAKANASHI Koki

    Springer, Singapore　2019

    ISBN: 9789811376108

Presentations 74

  1. Highly Sensitive Magnetic Sensors for Medical / Industrial Applications Invited

    Takahide Kubota

    Symposium on Magnetism and Spintronics (SMS 2024)　2024/07/20

  2. Manganese-based Materials for Spintronics Applications Invited

    Takahide Kubota

    Indo-Japan Workshop on Interface Phenomena for Spintronics (IJW-IPS 2022)　2022/03/10

  3. Perpendicular magnetic anisotropy in Cu2Sb-type (Mn-Cr)AlGe films: Mg-interface effects

    Takahide KUBOTA, Keita ITO, Rie Y. UMETSU, Koki TAKANASHI

    2021/03/16

  4. Mn-based Heusler Alloys for Spintronics Invited

    Takahide Kubota

    W2S Seminar (Webinar seris on Spintronics)　2020/12/10

  5. Perpendicular magnetic anisotropy in Cu2Sb-type (Mn-Cr)AlGe films: Layer thickness and adjacent layer dependence

    Takahide Kubota, Keita Ito, Rie Y. Umetsu, Koki Takanashi

    65th Annual Conference on Magnetism and Magnetic Materials　2020/11/06

  6. Layer thickness and underlayer dependence of perpendicular magnetic anisotropy in Cu2Sb-type (Mn-Cr)AlGe films

    Takahide KUBOTA, Keita ITO, Rie Y. UMETSU, Koki TAKANASHI

    2020年 第81回応用物理学会秋季学術講演会　2020/09/11

  7. Perpendicular magnetic anisotropy of Cu2Sb-type (Mn-Cr)AlGe films onto thermally oxidized silicon substrates

    T. Kubota, Y. Kota, K. Ito, R. Y. Umetsu, M. Sun, M. Mizuguchi, K. Takanashi

    64th Annual Conference on Magnetism and Magnetic Materials　2019/11/06

  8. Magnetic Properties of poly-crystalline Cu2Sb-type MnAlGe films with a (001)-texture

    T. Kubota, Y. Kota, K. Ito, R. Y. Umetsu, M. Sun, M. Mizuguchi, K. Takanashi

    The 43rd Annual Conference on MAGNETICS in Japan　2019/09/26

  9. Cr-concentration dependence of perpendicular magnetic anisotropy in Cu2Sb-type (Mn-Cr)AlGe films

    T. Kubota, Y. Kota, K. Ito, R. Y. Umetsu, M. Sun, M. Mizugucih, K. Takanashi

    The 80th Japan Society of Applied Physics Autumn Meeting　2019/09/18

  10. Mn-based perpendicularly magnetized films with Cu2Sb-type crystal structure Invited

    Takahide Kubota

    JSPS-EPSRC-DFG Core-to-Core Programme York-Tohoku-Kaiserslautern Research Symposium on “New-Concept Spintronics Devices”　2019/06/14

  11. Cu2Sb-type MnGaGe films with perpendicular magnetization International-presentation

    KUBOTA Takahide

    2019 Joint MMM-INTERMAG Conference　2019/01/16

  12. Anomalous Hall effects in five-elements Heusler alloy Co2(Fe-Mn)(Al-Si) films International-presentation

    KUBOTA Takahide

    2019 Joint MMM-INTERMAG Conference, Washington D. C.　2019/01/15

  13. Half-metallic Heusler alloys for giant magnetoresistance effects” International-presentation Invited

    KUBOTA Takahide

    8th JSPS Core-to-Core Workshop on “New-Concept Spintornic Devices”　2019/01/11

  14. Temperature dependence of current perpendicular-to-plane giant magnetoresistance using the interface tailored Heusler alloy electrodes

    KUBOTA Takahide

    NIMS Week 2018　2018/10/15

  15. Temperature dependence of current perpendicular-to-plane giant magnetoresistance using the interface tailored Heusler alloy electrodes

    KUBOTA Takahide, WEN Zhenchao, TAKANASHI Koki

    2018/09/18

  16. ホイスラー合金CPP-GMR素子における界面挿入効果

    窪田 崇秀, 温 振超, 高梨 弘毅

    日本磁気学会 第42回学術講演会　2018/09/13

  17. CPP-GMR of Heusler alloy based junctions: Spacer materials and interface effects International-presentation Invited

    KUBOTA Takahide, WEN Zhenchao, TAKANASHI Koki

    21st International Conference on Magnetism (ICM2018)　2018/07/20

  18. Exchange bias using antiferromagnetic Heusler alloy films

    KUBOTA Takahide, TSUCHIYA Tomoki, ITO Keita, SUGIYAMA Tomoko, TAKEDA Yukiharu, SAITOH Yuji, KIMURA Akio, TAKANASHI Koki

    MRIS　2018/06/07

  19. Interface layer effects for the current perpendicular-to-plane giant magnetoresistance junctions using half-metallic Heusler alloy electrodes International-presentation

    KUBOTA Takahide

    7th Workshop of the Core-to-Core Project Tohoku-York-Kaiserslautern, New concepts for future spintronic devices　2018/05/28

  20. Effects of Interface Layers for the Heusler Based Current-perpendicular-to-plane Giant Magnetoresistance Junctions International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    INTERMAG 2018　2018/04/26

  21. Ni2MnAl/Fe積層膜における交換バイアス効果の測定温度依存性

    土屋朋生, 窪田崇秀, 杉山知子, 高梨弘毅

    日本金属学会 2018年（第162回）春期講演大会　2018/03/20

  22. Effects of Interface Layers for the Heusler Based Current-perpendicular-to-plane Giant Magnetoresistance Junctions

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    第65回応用物理学会春季学術講演会　2018/03/19

  23. ホイスラー合金を用いたCPP-GMR効果 Invited

    窪田崇秀, 温振超, 高梨弘毅

    第79回日本磁気学会ナノマグネティックス研究会　2017/12/01

  24. ホイスラー合金系CPP-GMR素子における新規材料の探索 Invited

    窪田崇秀

    第１回CSRN-Tokyo Workshop 2017 東京大学スピントロニクス学術連携研究教育センター（CSRN）主催 ワークショップ 新しいスピントロニクス機能材料の開発とその物性制御　2017/10/27

  25. Co2Fe0.4Mn0.6Si/L12 型Ag3Mg/Co2Fe0.4Mn0.6Si素子における膜面垂直通電型巨大磁気抵抗効果の強磁性層膜厚依存性

    窪田崇秀, 伊奈幸佑, 温振超, 高梨弘毅

    日本磁気学会第41回学術講演会　2017/09/21

  26. A2構造Mn2VAlの磁性とFe積層膜における交換磁気異?性の熱処理条件依存性

    土屋朋生, 小林亮太, 窪田崇秀, 斉藤耕太郎, 小野寛太, 大原高志, 中尾朗子, 高梨弘毅

    日本金属学会 2017年秋期（第161回）講演大会　2017/09/08

  27. スピントロニクス分野におけるホイスラー合金薄膜 Invited

    窪田崇秀, 高梨弘毅

    日本金属学会 2017年秋期（第161回）講演大会　2017/09/07

  28. ホイスラー合金とL12型Ag3Mg規則合金中間層を用いたCPP-GMR素子 Invited

    窪田崇秀

    第184回スピニクス研究会　2017/07/28

  29. Current perpendicular to plane type giant magnetoresistance effects using an L12-Ag3Mg spacer and half-metallic Co2Fe0.4Mn0.6Si electrodes International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    York-Tohoku-Kaiserslautern Research Symposium on "New-Concept Spintronics Devices　2017/06/21

  30. Layer Thickness Dependence of CPP-GMR in Co2Fe0.4Mn0.6Si | L12-type Ag-Mg | Co2Fe0.4Mn0.6Si Devices International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    INTERMAG 2017　2017/04/24

  31. Co2Fe0.4Mn0.6Si/L12 Ag-Mg/Co2Fe0.4Mn0.6Si素子における巨大磁気抵抗効果の中間層膜厚及び熱処理温度依存性

    窪田崇秀, 伊奈幸佑, 温振超, 高梨弘毅

    日本金属学会2017年春期（第160回）講演大会　2017/03/15

  32. Current Perpendicular-to-plane Giant Magnetoresistance Junctions with Half-metallic Heusler Alloy Electrodes International-presentation Invited

    T. Kubota

    Indo-Japan Workshop on “Magnetism at the nanoscale” 2016　2016/12/01

  33. Temperature and Spacer-layer Thickness Dependence in Co2Fe0.4Mn0.6Si/Ag-Mg/Co2Fe0.4Mn0.6Si CPP-GMR Devices International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    61st Annual Conference on Magnetism and Magnetic Materials　2016/10/31

  34. Current Perpendicular-to-plane Giant Magnetoresistance Junctions with Half-metallic Heusler alloy Electrodes International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    2016 Tohoku University and University of York Joint Seminar: Prospect of Future Spintronics ~from physics to devices~　2016/07/29

  35. Spintronics with Heusler alloys: Perpendicularly magnetized films and exchange bias effects International-presentation Invited

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    5th Japan-EU Open Workshop on Heusler Alloy Replacement for Iridium　2016/05/30

  36. L12 Ag-Mg ordered alloy spacer layer for Heusler alloy based current perpendicular-to-plane giant magnetoresistance devices

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    第63回応用物理学会春季学術講演会　2016/03/19

  37. Current perpendicular to plane giant magnetoresistance effect using Co2(Fe-Mn)Si electrodes and a Ag-Mg spacer layer: Ag-Mg composition dependence International-presentation

    T. Kubota, Y. Ina, Z. Wen, K. Takanashi

    13th Joint MMM-INTERMAG Conference　2016/01/11

  38. Epitaxially grown Heusler alloy thin films: CPP-GMR and exchange bias effects International-presentation

    T. Kubota, K. Takanashi

    4th Japan-EU Open Workshop on “Heusler Alloy Replacement for Iridium (HARFIR)　2015/11/07

  39. ホイスラー合金を用いた面直通電型巨大磁気抵抗素子

    窪田崇秀, 伊奈幸佑, 温振超, 高梨弘毅

    磁気記録・情報ストレージ研究会（MR）　2015/10/22

  40. Ag-Mg合金中間層とCo2Fe0.4Mn0.6Siホイスラー合金電極を用いたCPP-GMR素子

    窪田崇秀, 成澤寛行, 伊奈幸佑, 高梨弘毅

    日本金属学会 2015年秋季（第157回）講演大会　2015/09/16

  41. Ag-Mg spacer composition dependence of current perpendicular to plane type giant magnetoresistance effect in Co2(Fe-Mn)Si/Ag-Mg/Co2(Fe-Mn)Si junctions

    T. Kubota, Y. Ina, H. Narisawa, K. Takanashi

    第76回応用物理学会秋季学術講演会　2015/09/13

  42. CPP-GMR effect using Ag-Mg ordered alloy spacer layer and Heusler alloy Co2(Fe,Mn)Si electrodes International-presentation Invited

    T. Kubota, H. Narisawa, K. Takanashi

    The 26th Magnetic Recording Conference (TMRC)　2015/08/17

  43. Enhanced resistance change of current perpendicular-to-plane giant magnetoresistance junctions using an L12 ordered Ag-Mg spacer layer International-presentation

    T. Kubota, H. Narisawa, K. Takanashi

    International Colloquium on Magnetic Films and Surfaces　2015/07/12

  44. Current perpendicular to film plane giant magnetoresistance effect using Ag-Mg spacer layer International-presentation Invited

    T. Kubota, H. Narisawa, K. Takanashi

    Energy Materials Nanotechnology Istanbul Meeting　2015/07/01

  45. Exchange anisotropy of epitaxally grown Ni2MnAl/X bilayer (X: Fe, Co, Co2MnSi) International-presentation

    T. Tsuchiya, T. Sugiyama, T. Kubota, K. Takanashi

    York Tohoku Kaiserslautern symposium on “New-Concept Spintronics Devices　2015/06/11

  46. Anisotropic Magnetoresistance Effect in Co2(Fe-Mn)(Al-Si) Heusler Alloy Thin Films International-presentation

    Hitomi Yako, Takahide Kubota, Koki Takanashi

    IEEE International Magnetics Conference 2015　2015/05/11

  47. Co2FexMn1-xSi ホイスラー合金を用いた CPP-GMR 素子出力電圧のバイアス電流依存性

    成澤寛行, 窪田崇秀, 高梨弘毅

    日本金属学会2015年春期講演大会　2015/03/18

  48. Current-perpendicular-to-plane giant magnetoresistance effect in Co2(Fe-Mn)Si/Ag-Mg/Co2(Fe-Mn)Si junctions

    Hiroyuki Narisawa, Takahide Kubota, Koki Takanashi

    第62回応用物理学会春季学術講演会　2015/03/11

  49. Epitaxially grown Mn2CoAl Heusler alloy thin films: Structural, magnetic and electrical transport properties International-presentation

    Takahide Kubota, Tomoko Sugiyama, Koki Takanashi

    59th Annual Conference on Magnetism and Magnetic Materials　2014/11/03

  50. Ni2MnAl/Feエピタキシャル薄膜の作製と交換バイアス効果

    土屋朋生, 杉山知子, 窪田崇秀, 水口将輝, 高梨弘毅, 上野哲朗, 井波暢人, 小野寛太

    日本金属学会2014年秋季講演大会　2014/09/24

  51. Magnetic and electrical transport properties of Mn2CoAl Heusler alloy thin films

    窪田崇秀, 杉山知子, 高梨弘毅

    第75回応用物理学会秋季学術講演会　2014/09/17

  52. Magnetic Properties of Epitaxially grown Ni2MnAl and (Mn-Co)2VGa Films International-presentation

    Takahide Kubota, Koki Takanashi

    2nd Japan-EU Joint Workshop on HARFIR　2014/09/12

  53. ホイスラー合金Mn-Co-V-Ga薄膜の磁気特性

    土屋朋生, 田代敬之, 杉山知子, 窪田崇秀, 成田一生, 水口将輝, 上野哲朗, 井波暢人, 小野寛太, 高梨弘毅

    第38回日本磁気学会学術講演会　2014/09/02

  54. Magnetic and electrical transport properties of epitaxially grown Ni2MnAl films International-presentation

    T. Tsuchiya, T. Sugiyama, T. Kubota, M. Mizuguchi, T. Ueno, N. Inami, K. Ono, K. Takanashi

    International Union of Materials Research Societies- The IUMRS International Conference in Asia　2014/08/24

  55. Perpendicular magnetic anisotropy of Co2FexMn1−xSi Heusler alloy ultra-thin films International-presentation

    T. Kamada, T. Kubota, J. Kim, S. Takahashi, Y. Sonobe, K. Takanashi

    IEEE International Magnetics Conference 2014　2014/05/04

  56. UHV co-sputtering for growth optimization International-presentation

    T. Kubota, K. Takanashi

    HARFIR EU-Japan Kick Off Meeting　2014/05/03

  57. Tunnel magnetoresistance effect using perpendicularly magnetized tetragonal- and cubic- Mn-Co-Ga Heusler alloy electrode International-presentation

    T. Kubota, S. Mizukami, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    The 58th Annual Magnetism and Magnetic Materials Conference　2013/11/04

  58. Magnetoresistance effect of perpendicularly magnetized tunnel junctions using Heusler type Mn-Co-Ga electrode

    T. Kubota, S. Mizukami, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    第74回応用物理学会秋季学術講演会　2013/09/16

  59. ホイスラー型Mn-Co-Ga エピタキシャル薄膜の作製とトンネル磁気抵抗効果

    窪田崇秀, S. Ouardi, 水上成美, G. H. Fecher, C. Felser, 永沼博, 大兼幹彦, 安藤康夫, 宮﨑照宣

    第37回日本磁気学会学術講演会　2013/09/03

  60. 正方晶及び立方晶ホイスラー型(Mn3−δCo)-Ga 薄膜の結晶構造、磁気・伝導特性のCo 組成依存性

    窪田崇秀, Ouardi, Siham, 水上 成美, Fecher, Gerhard H.,Felser, Claudia, 安藤 康夫, 宮﨑 照宣

    第60回応用物理学会春季学術講演会　2013/03/27

  61. Magnetic and transport properties of Mn3-xCoGa epitaxially grown tetragoal or cubic Heusler compound thin films International-presentation

    T. Kubota, S. Ouardi, S. Mizukami, G. H. Fecher, C. Felser, Y. Ando, T. Miyazaki

    12th Joint MMM-INTERMAG conference　2013/01/14

  62. Magnetoresistance Effect of L10-Mn62Ga38/Fe/MgO/CoFe Perpendicularly Magnetized Layer Based Tunnel Junctions International-presentation

    T. Kubota, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    The 2nd International Conference of AUMS　2012/10/02

  63. Dependence of Tunnel Magnetoresistance Effect on Fe Insertion layer thickness of L10-MnGa/Fe/MgO/CoFe Junctions International-presentation

    T. Kubota, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, T. Miyazaki

    The 21th International Colloquium on Magnetic Films and Surfaces　2012/09/24

  64. Tunnel Magnetoresistance Effect of Perpendicularly Magnetized MnGa/MgO/CoFe Junctions International-presentation

    T. Kubota, M. Araidai, Q. L. Ma, S. Mizukami, X. M. Zhang, H. Naganuma, M. Oogane, Y. Ando, M. Tsukada, T. Miyazaki

    The 2012 WPI-AIMR Annual Workshop　2012/02

  65. Magnetoresistance effect in Tunnel Junctions with Perpendicularly Magnetized MnGa Film International-presentation

    T. Kubota, D. Watanabe, F. Wu, S. Mizukami, H. Naganuma, X. Zhang, M. Oogane, A. Sakuma, Y. Ando, T. Miyazaki

    55th Annual conference on Magnetism and Magnetic Materials　2010/11/14

  66. CPP-MR Devices Using Semimetallic-Fe2VAl Spacer International-presentation

    T. Kubota, M. Oogane, S. Mizukami, H. Naganuma, Y. Ando, T. Miyazaki

    Joint JST/DFG-Workshop “Spin wave aspects in Spintronics”　2010/10/04

  67. Magnetoresistance Effect in Co2MnSi/Semimetallic-Fe2VAl/CoFe Functions International-presentation

    T. Kubota, M. Oogane, S. Mizukami, H. Naganuma, T. Miyazaki, Y. Ando

    The 2nd International Symposium on Advanced Magnetic Materials and Applications　2010/07

  68. Investigations of ferrimagnetism in Mn2VAl Heusler epitaxial thin film International-presentation

    T. Kubota, K. Kodama, T. Nakamura, Y. Sakuraba, M. Oogane, K. Takanashi, Y. Ando

    11th Joint MMM-Intermag Conference　2010/01

  69. Composition dependence of half-metallicity in tunneling transport properties and Gilbert damping constant in Co2FexMn1-xSi Heusler alloys International-presentation

    T. Kubota, S. Tsunegi, M. Oogane, S. Mizukami, T. Miyazaki, H. Naganuma, Y. Ando

    20th International colloquium on magnetic films and surfaces　2009/07

  70. Tunnel magnetoresistance effect and Gilbert damping constant in Co2FexMn1-xSi Heusler alloys depending on the film composition International-presentation

    T. Kubota, S. Tsunegi, M. Oogane, S. Mizukami, T. Miyazaki, H. Naganuma, Y. Ando

    Joint Workshop DFG Research Unit 559 and JST Strategic Japanese-German Cooperative Programme　2009/07

  71. Brillouin Light Scattering Investigations on Co2MnAlxSi1-x Heusler Thin Films International-presentation

    T. Kubota, J. Hamler, Y. Sakuraba, O. Gaier, M. Oogane, B. Hillebrands, K. Takanashi, Y. Ando

    53rd Annual conference on Magnetism and Magnetic Materials　2008/11

  72. Magnetic properties of epitaxial Heusler alloy thin films International-presentation

    T. Kubota, J. Hamrle, Y. Sakuraba, O. Gaier, M. Oogane, B. Hillebrands, A. Sakuma, Y. Ando

    Global COE Program, Materials Integration International Center of Education and Research Reports by Young Researchers　2008/03

  73. Tunneling Spin Polarization of Co2MnSi Heusler Alloy International-presentation

    T. Kubota, Y. Sakuraba, M. Oogane, Y. Ando, T. Miyazaki

    International Symposium on Advanced Magnetic Materials and Applications　2007/05

  74. Tunneling Spin Polarization of CoFeB alloys Measured by Superconducting Tunneling Spectroscopy International-presentation

    T. Kubota, T. Daibou, M. Oogane, Y. Ando, T. Miyazaki

    19th International Colloquium on Magnetic Films and Surfaces　2006/08

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Industrial Property Rights 8

  1. 膜面垂直通電型巨大磁気抵抗素子及び磁気デバイス

    窪田崇秀, 成澤寛行, 高梨弘毅

    特許第6498049号

    Property Type: Patent

  2. 磁気抵抗素子および磁気メモリ

    加藤侑志, 大坊忠臣, 北川英二, 落合隆夫, 伊藤順一, 窪田崇秀, 水上成美, 宮﨑照宣

    特許第6119051号

    Property Type: Patent

  3. 磁気抵抗素子および磁気メモリ

    加藤侑志, 大坊忠臣, 北川英二, 落合隆夫, 窪田崇秀, 水上成美, 宮﨑照宣

    特許第5597899号

    Property Type: Patent

  4. 磁気抵抗素子および磁気メモリ

    加藤侑志, 大坊忠臣, 北川英二, 窪田崇秀, 水上成美, 宮崎照宣

    特許第5499264号

    Property Type: Patent

  5. 磁気抵抗素子および磁気メモリ

    大坊忠臣, 伊藤順一, 甲斐正, 天野実, 與田博明, 宮崎照宣, 水上成美, 窪田崇秀, 薬師寺啓, 湯浅新治, 久保田均, 長浜太郎, 福島章夫, 安藤功兒

    特許第5761788号

    Property Type: Patent

  6. ホイスラー合金材料、磁気抵抗素子及び磁気デバイス

    大兼幹彦, 佐藤丈, 窪田崇秀, 永沼博, 安藤康夫

    特許第5413646号

    Property Type: Patent

  7. Magetoresistive element and magnetic memory

    Y. Kato, T. Daibou, E. Kitagawa, T. Ochiai, T. Kubota, S. Mizukami, T. Miyazaki

    US8,680,633 B1

    Property Type: Patent

  8. Magnetoresistive element and magnetic memory

    T. Daibou, J. Ito, T. Kai, M. Amano, H. Yoda, T. Miyazaki, S. Mizukami, T. Kubota, S. Yuasa, K. Yakushiji, H. Kubota, T. Nagahama, F. Akio, K. Ando

    US 8,680,632 B2

    Property Type: Patent

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Research Projects 12

  1. Pioneering development of electromagnetic functions in high entropy alloys

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Challenging Research (Pioneering)

    Institution: Tohoku University

    2021/07 - 2025/03

  2. ハーフメタルホイスラー合金を用いた超伝導スピントロニクス素子の創製

    重田 出, 窪田 崇秀, 廣井 政彦

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(C)

    Institution: 鹿児島大学

    2020/04 - 2024/03

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    近年，強磁性体の伝導電子スピンや局在スピンを積極的にデバイスへ利用することを目的としたスピントロニクスの研究が盛んに行われている。この分野において，その発展や応用の拡大のために欠かせない物質が「ハーフメタル」である。このハーフメタルを電極材料に用いることによって，トンネル磁気抵抗(TMR)素子や巨大磁気抵抗(GMR)素子の特性向上が図られている。 超伝導デジタル回路の半導体回路に対する優位性は，ジョセフソン素子の高速性・低消費電力性と共に，無損失性という超伝導体本来の基本的な特性に基づくものである。この数年間で超伝導デジタル回路の消費電力は1/10に低減され，2019年にはジョセフソン素子を用いた量子コンピュータの量子超越性が告され，量子コンピュータの研究も新しい段階に入った。一方，低消費電力・低温動作可能な超伝導メモリは近年，磁束量子の保持による記録に代わり，素子内に組み込まれた磁性体の磁化の向きで記憶素子を構成する方式が提案され，その集積化の可能性から研究が一気に活性化している。 そこで本研究の目的は，ハーフメタルと超伝導体を融合した新機能デバイスの開発を念頭に，ハーフメタルホイスラー合金と超伝導体を用いたエピタキシャル積層膜とサブミクロンサイズの微細加工技術を駆使し，既存のGMR素子の特性を凌ぐ超伝導スピントロニクス素子を創製に関する研究に取り組むことである。本年度は，前年度に引き続き，① 超伝導体NbNとハーフメタルホイスラー合金Co2(Fe,Mn)Siのエピタキシャル積層膜の作製を行い，② 強磁場中輸送特性の測定に取り組むことによって，NbNとCo2(Fe,Mn)Siの積層膜を特徴づける物理パラメータを決定するとともに，NbNとCo2(Fe,Mn)Siの積層膜の磁場中輸送特性の特徴を明らかにした。次いで，③ NbNとCo2(Fe,Mn)Siを用いた面直通電型の超伝導巨大磁気抵抗(CPP-SGMR)素子を作製して，CPP-SGMR素子の特性の評価を行った。

  3. Spin-orbit-torque in half-metallic inverse Heusler alloy films

    Offer Organization: Japan Society for the Promotion of Science

    System: Grant-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (C)

    Institution: Tohoku University

    2020/04 - 2023/03

  4. 無配向基板上への高磁気異方性規則合金垂直磁化薄膜の創製と高効率スピン軌道トルク磁化反転 Competitive

    窪田 崇秀

    Offer Organization: 公益財団法人 村田学術振興財団

    System: 第34回(平成30年度) 研究助成

    2018/07 - 2019/06

  5. 低エネルギー高速磁化反転技術のための反強磁性構造の創製 Competitive

    関剛斎, 窪田崇秀今村裕志, 森山貴広

    Offer Organization: 日本学術振興会

    System: 科学研究費補助金 基盤研究(B)

    2016/04 - 2019/03

  6. New development of ordered-alloy materials for spintronics

    TAKANASHI Koki, MIZUGUCHI Masaki, SAKURABA Yuya, SEKI Takeshi, KUBOTA Takahide

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research

    Category: Grant-in-Aid for Scientific Research (S)

    Institution: Tohoku University

    2013/05 - 2018/03

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    The purpose of this research project was the development of ordered alloys for high performance and multi-functional spintronics devices and their application to spincaloritronics. We successfully improved the giant magnetoresistance (GMR) effect for the device with L21-ordered Co2(FeMn)Si full-Heusler alloy, and observed room temperature GMR using C1b-ordered NiMnSb half-Heusler alloy. We also achieved high magnetic anisotropy and low magnetic damping simultaneously for L11-type-stacked CoNi. In addition, we revealed the material dependence of anomalous Nernst effect, leading to the guiding principle for high spincaloritronic functionality.

  7. 金属ベース磁気抵抗素子の高出力化のための非磁性規則合金薄膜の探索 Competitive

    窪田 崇秀

    Offer Organization: 公益財団法人 服部報公会

    System: 平成26年度工学研究奨励援助

    2014/10 - 2015/09

  8. 面直通電型磁気抵抗素子のための新規中間層材料の探索 Competitive

    窪田 崇秀

    Offer Organization: 一般財団法人 材料科学技術振興財団

    System: 平成26年度研究助成

    2014/04 - 2014/12

  9. ハーフメタル熱電材料を用いた高効率冷却素子の開発 Competitive

    窪田 崇秀

    Offer Organization: 公益財団法人 泉科学技術振興財団

    System: 研究助成

    2013/10 - 2014/09

  10. 擬ギャップ半導体ホイスラー合金垂直磁化薄膜の創製 Competitive

    窪田 崇秀

    Offer Organization: 公益財団法人 村田学術振興財団

    System: 第29回（平成25年度）研究助成金

    2013/07 - 2014/08

  11. 高磁気異方性垂直磁化薄膜による半導体へのスピン注入 Competitive

    窪田 崇秀

    Offer Organization: 日本学術振興会

    System: 科学研究費補助金 若手研究（B)

    2012/04 - 2014/03

  12. 超高出力・低消費電力スピンメモリの為のハーフメタルフェリ磁性体の開発 Competitive

    窪田 崇秀

    Offer Organization: 日本学術振興会

    System: 科学研究費補助金 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2008/04 - 2010/03

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    本研究では、次世代メモリとして有望視されているSpin-RAMに用いる磁気トンネル接合(MTJ)の磁化フリー層への応用を念頭に高スピン分極且つ低飽和磁化なハーフメタルフェリ磁性ホイスラー合金、Mn_2VAlの薄膜作製と物性の解明を目的として研究を行った。さらに、素子化の際に有用な、関連するホイスラー合金についても薄膜の作製と物性の系統的な調査に取り組んだ。Mn_2VAlについては、昨年度までに作製に成功した薄膜試料の磁気構造の詳細な解明に取り組んだ。実験では、軟X線磁気円二色性(XMCD)を用いた元素選択的な磁化曲線の測定を行い、Mn_2VAl中のMnとVがフェリ磁性的に真逆の磁化過程をとることを実験的に示すことに初めて成功した。さらに、磁気光学総和則を用いることでXMCDスペクトルよりMnとVの磁気モーメントを定量的に評価し、結晶のL2_1構造の長距離規則度の増大に伴って、各磁気モーメントも大きくなることを明らかにした。一方で、MTJの磁化固定層用高スピン分極材料として有望なCo基ホイスラー合金についても、スピン分極率に加え、交換スティフネス定数や磁気異方性定数磁気特性の系統的な調査を併せて行った。その結果、L2_1規則構造を有するCo基ホイスラー合金では、交換スティフネス定数(磁化の揺らぎに対する磁気的な硬さを表す量)が、hcp-Co(強磁性材料の中でも特に交換スティフネス定数が大きい)以上と非常に大きくなることを明らかにした。 以上の実験結果は、Spin-RAMをはじめとするスピントロニクスデバイスの高効率スピン偏極源開発のための指針と成り得る重要な成果である。

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