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Spin-orbit-torque in inverse Heusler alloy films

Research Project

Project/Area Number 20K05296
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 29010:Applied physical properties-related
Research InstitutionTohoku University

Principal Investigator

Kubota Takahide  東北大学, 工学研究科, 特任准教授 (00580341)

Co-Investigator(Kenkyū-buntansha) 小田 洋平  福島工業高等専門学校, 一般教科, 准教授 (80751875)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsスピントロニクス / 垂直磁化膜 / MRAM / マンガン / 金属間化合物 / スピン軌道相互作用 / 垂直磁化 / ホイスラー合金 / 磁気異方性 / スピン軌道トルク / 異常ホール効果 / ハーフメタル
Outline of Research at the Start

逆ホイスラー合金における結晶格子のひずみとスピン軌道トルクの生成効率との関係を明らかにすることを目的とする。
スピン軌道トルクとは、電流誘起の磁化駆動原理の一つであり、結晶の空間反転対称性の破れに起因した有効磁場によって誘起される。逆ホイスラー合金の中で、伝導電子のスピン分極率が1であるハーフメタルとなる材料中で誘起されるスピン軌道トルクを実験的に明らかにする。加えて、スピン軌道相互作用が関与する磁気異方性、異常ホール伝導についても系統的に実験を行うと共に、第一原理計算に基づく電子論的考察を行い、ハーフメタル材料におけるスピン軌道トルク高効率化のための知見を得る。

Outline of Final Research Achievements

Lattice distortion dependence of magnetocrystalline anisotropy and spin-orbit torque were investigated for epitaxially grown inverse Heusler alloy, Mn2CoGa, in this study. We successfully fabricated a series of Mn2CoGa films showing different values of c/a in our experiments, and discovered that the magnetocrystalline anisotropy energy (Ku) was proportional to c/a of the samples. The ab initio calculation also demonstrated the c/a dependent Ku and explained according to the change of electronic structure. Finally, we successfully demonstrated spin-orbit torque in Mn2CoGa films experimentally.

Academic Significance and Societal Importance of the Research Achievements

磁性薄膜における磁気異方性並びにスピン軌道トルクの制御は磁気記録や磁気メモリ応用において重要な課題である。本研究で見出した材料は、薄膜作製条件によりそれらの物性を制御できるという特徴がある。従来材料では、材料組成そのものを変える、あるいは、他の材料との積層界面を形成することが物性制御に必要であったが、単一の材料でそれを実現したことは、学術、応用の両面で重要な意義がある成果である。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (15 results)

All 2023 2022 2021 Other

All Int'l Joint Research (4 results) Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 3 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] NISER(インド)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of York(英国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Peter Guenberg Institute(ドイツ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] The University of York(英国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Magnetization Precession at Sub‐Terahertz Frequencies in Polycrystalline Cu2Sb‐Type (Mn-Cr)AlGe Ultrathin Films2022

    • Author(s)
      Sasaki Yuta、Hiramatsu Ryoya、Kota Yohei、Kubota Takahide、Sonobe Yoshiaki、Sakuma Akimasa、Takanashi Koki、Kasai Shinya、Takahashi Yukiko K.
    • Journal Title

      Small

      Volume: 18 Issue: 20 Pages: 2200378-2200378

    • DOI

      10.1002/smll.202200378

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Magnetoelastic anisotropy in Heusler-type Mn(2-δ)CoGa(1+δ) films2022

    • Author(s)
      Kubota Takahide、Takano Daichi、Kota Yohei、Mohanty Shaktiranjan、Ito Keita、Matsuki Mitsuhiro、Hayashida Masahiro、Sun Mingling、Takeda Yukiharu、Saitoh Yuji、Bedanta Subhankar、Kimura Akio、Takanashi Koki
    • Journal Title

      Physical Review Materials

      Volume: 6 Issue: 4 Pages: 044405-044405

    • DOI

      10.1103/physrevmaterials.6.044405

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Evaluation of edge domains in giant magnetoresistive junctions2021

    • Author(s)
      Frost W, Seki T, Kubota T, Ramos R, Saitoh E, Takanashi K, Hirohata A.
    • Journal Title

      Applied Physics Letters

      Volume: 118 Issue: 17 Pages: 172405-172405

    • DOI

      10.1063/5.0049315

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Perpendicular magnetic anisotropy in ultra-thin Cu2Sb-type (Mn-Cr)AlGe films fabricated onto thermally oxidized silicon substrates2021

    • Author(s)
      T. Kubota, K. Ito, R. Y. Umetsu, K. Takanashi
    • Journal Title

      Applied Physics Letters

      Volume: 118 Issue: 26 Pages: 262404-262404

    • DOI

      10.1063/5.0049899

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Microstructures and Interface Magnetic Moments in Mn2VAl/Fe Layered Films Showing Exchange Bias2021

    • Author(s)
      Kubota Takahide、Shimada Yusuke、Tsuchiya Tomoki、Yoshikawa Tomoki、Ito Keita、Takeda Yukiharu、Saitoh Yuji、Konno Toyohiko、Kimura Akio、Takanashi Koki
    • Journal Title

      Nanomaterials

      Volume: 11 Issue: 7 Pages: 1723-1723

    • DOI

      10.3390/nano11071723

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 垂直磁化(Mn-Cr)AlGe /W積層膜における電流誘起磁化反転2023

    • Author(s)
      窪田崇秀、加藤剛志、本多周太、園部義明、高梨弘毅
    • Organizer
      第70回応用物理学会春季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Current induced magnetization switching in (Mn-Cr)AlGe films showing perpendicular magnetization2022

    • Author(s)
      Takahide Kubota, Syuta Honda, Yoshiaki Sonobe, Takeshi Kato, Koki Takanashi
    • Organizer
      67th Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Lattice distortion and transport properties in Mn2-δCoGa1+δ thin films2021

    • Author(s)
      Mitsuhiro Matuki, Takahide Kubota, Yohei Kota, Keita Ito, Yong-Chang Lau, Koki Takanashi
    • Organizer
      第82回応用物理学会秋季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Mn2-δCoGa1+δにおける垂直磁気異方性の格子歪依存性2021

    • Author(s)
      松木充弘、窪田崇秀、小田洋平、伊藤啓太、高梨弘毅
    • Organizer
      第140回金属材料研究所講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Tetragonal strain and perpendicular magnetic anisotropy in Mn2-δCoGa1+δ thin films2021

    • Author(s)
      Mitsuhiro Matuki, Takahide Kubota, Yohei Kota, Keita Ito, Koki Takanashi
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] ホイスラー合金Mn2-δCoGa1+δ薄膜の歪誘起垂直磁気異方性2021

    • Author(s)
      松木充弘、窪田崇秀、小田洋平、伊藤啓太、高梨弘毅
    • Organizer
      日本金属学会 第168回講演大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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