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Deciphering spin-orbit torque in magnetic single layers: Towards spin-torque devices with extended scalability

Research Project

Project/Area Number 20K15156
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

LAU Yongchang  東北大学, 金属材料研究所, 特任助教 (60795764)

Project Period (FY) 2020-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
KeywordsCompensated ferrimagnet / Spin-orbit torque / Spin-orbitronics / Spin caloritronics / Anomalous Nernst effect / Spintronic / Magnetic materials / Ferrimagnet / Antiferromagnet
Outline of Research at the Start

Understanding spin-orbit torque in magnetic single layer may allow realization of novel non-volatile magnetic random access memory(MRAM) with enhanced storage capacity and reduced power consumption.

Outline of Final Research Achievements

The main achievements of this project include: (1) Realizing two types of manganese and ruthenium-based alloys showing high tunability of properties by varying composition, temperature, and strain. Unlike the usual magnetic materials, these alloys with very limited magnetic response can however generate a large electrical signal from an electric field or a temperature gradient. (2) Providing evidence that domain twinning control will closely influence the spin-orbit torque in magnetic single layers. However, producing twinning-free samples remains to be a challenge. (3) Revealing material design principles for realizing efficient charge-to-spin conversion using the spin Hall effect. (4) Applying the knowledge from (3) to demonstrate large spin Hall effect in various material systems.

Academic Significance and Societal Importance of the Research Achievements

我々は現在"Big Data"時代へと突入し、高い書換耐性と低消費電力を備える低コストな超高密度データストレージへの要望が高まっている。本研究課題は、そのような要請を満足しうる磁気ランダムアクセスメモリ技術の研究や開発に資するものである。また学術的観点からは、本研究で得られた成果は、スピンに関連した特性を発揮できる材料を設計するための指針を与え、将来の新材料開発を加速するためのガイドラインとなる。社会的な観点からは、本研究の成果は、上記の理想的なスピントロニクスメモリの実現に向けた一歩と位置付けられる。

Report

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

    (12 results)

All 2021 2020 Other

All Journal Article (4 results) (of which Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (7 results) (of which Int'l Joint Research: 3 results) Remarks (1 results)

  • [Journal Article] Spin Hall effect in a spin-1 chiral semimetal2021

    • Author(s)
      Ke Tang, Yong-Chang Lau, Kenji Nawa, Zhenchao Wen, Qingyi Xiang, Hiroaki Sukegawa, Takeshi Seki, Yoshio Miura, Koki Takanashi, and Seiji Mitani
    • Journal Title

      PHYSICAL REVIEW RESEARCH

      Volume: 3 Issue: 3

    • DOI

      10.1103/physrevresearch.3.033101

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Highly fcc-textured Pt-Al alloy films grown on MgO(001) showing enhanced spin Hall efficiency2021

    • Author(s)
      Yong-Chang Lau, Takeshi Seki, Koki Takanashi
    • Journal Title

      APL MATERIALS

      Volume: 9 Issue: 8

    • DOI

      10.1063/5.0052544

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Spin-orbit torque in a Ni-Fe single layer2021

    • Author(s)
      Seki Takeshi、Lau Yong-Chang、Iihama Satoshi、Takanashi Koki
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 9 Pages: 094430-094430

    • DOI

      10.1103/physrevb.104.094430

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Magnetization switching induced by spin?orbit torque from Co2MnGa magnetic Weyl semimetal thin films2021

    • Author(s)
      Tang Ke、Wen Zhenchao、Lau Yong-Chang、Sukegawa Hiroaki、Seki Takeshi、Mitani Seiji
    • Journal Title

      Applied Physics Letters

      Volume: 118 Issue: 6 Pages: 062402-062402

    • DOI

      10.1063/5.0037178

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Anomalous Nernst effect in compensated ferrimagnetic Mn2RuxGa2021

    • Author(s)
      Y.-C. Lau, J. Wang, T. Kubota, K. Takanashi
    • Organizer
      IEEE International Magnetics Conference (INTERMAG) 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anomalous Nernst effect in compensated ferrimagnetic Mn2RuxGa2021

    • Author(s)
      Y.-C. Lau, J. Wang, T. Kubota, K. 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] Anomalous Hall and spin Hall effect in kagome-lattice cobalt shandite films2021

    • Author(s)
      Y.-C. Lau, J. Ikeda, K. Fujiwara, A. Ozawa, T. Seki, K. Nomura, A. Tsukazaki, and K. Takanashi
    • Organizer
      令和3年東北大学電気通信研究所共同プロジェクト研究会「固体中のスピン・軌道ダイナミクスとその制御」
    • Related Report
      2020 Research-status Report
  • [Presentation] Spin Hall effect in paramagnetic kagome-lattice semimetal Co3Sn2S2(CSS)2020

    • Author(s)
      Y.-C. Lau, J. Ikeda, K. Fujiwara, T. Seki, A. Tsukazaki, K. Takanashi
    • Organizer
      65th Annual Conference on Magnetism and Magnetic Materials (MMM) 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Spin Hall effect in paramagnetic kagome-lattice topological semimetal Co3Sn2S22020

    • Author(s)
      Y.-C. Lau, J. Ikeda, K. Fujiwara, T. Seki, A. Tsukazaki, K. Takanashi
    • Organizer
      第81回応用物理学会秋季学術講演会
    • Related Report
      2020 Research-status Report
  • [Presentation] Perpendicular magnetic anisotropy and spin Hall effect in X/Co/Y (X, Y = Pt, Pd) metallic trilayers2020

    • Author(s)
      Y.-C. Lau, Z. Wen, K. Ito, J. Ieda, T. Sasaki, T. Seki and K. Takanashi
    • Organizer
      Spin-RNJ若手オンライン研究発表会
    • Related Report
      2020 Research-status Report
  • [Presentation] Origin of field-like torque enhancement with decreasing Co thickness in X/Co/Y (X, Y = Pt, Pd) metallic trilayers2020

    • Author(s)
      Y.-C. Lau, Z. Wen, K. Ito, J. Ieda, T. Taniguchi, T. Sasaki, T. Seki and K. Takanashi
    • Organizer
      IEEE International Magnetics Conference (INTERMAG) 2020 - Canceled
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Remarks] 研究室ホームページ

    • URL

      http://magmatelab.imr.tohoku.ac.jp/

    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2023-01-30  

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