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Development of CPP-AMR single crstal thin films for nano-sized high-sensitive magnetic reproducing devices

Research Project

Project/Area Number 20H02177
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 21050:Electric and electronic materials-related
Research InstitutionTohoku University

Principal Investigator

Tsunoda Masakiyo  東北大学, 工学研究科, 准教授 (80250702)

Co-Investigator(Kenkyū-buntansha) 古門 聡士  静岡大学, 工学部, 教授 (50377719)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2021: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2020: ¥6,890,000 (Direct Cost: ¥5,300,000、Indirect Cost: ¥1,590,000)
Keywordsスピントロニクス / 異方性磁気抵抗効果 / 磁気抵抗効果 / AMR
Outline of Research at the Start

伝導電子が結晶格子の熱振動によって散乱されるまでに移動する平均的距離よりも薄い強磁性単結晶薄膜を用いた膜面垂直通電(CPP)トランスバース(Tr)異方性磁気抵抗(AMR)効果の研究を行う。大きなCPP-Tr-AMR効果を示す強磁性薄膜材料を電子論的起源の観点から探索・開発し、新たな磁気センサー素子の実現を目指す。
本研究の成果から得られるセンサー素子では、室温でも実用上必要な大きさの信号強度が期待できるため、超高密度ハードディスク(HDD)を実現する革新的な技術となる。

Outline of Final Research Achievements

In order to achieve large magnetoresistance ratio in single-layered ultra-thin ferromagnetic metallic thin films, we investigated anisotropic magnetoresistance (AMR) effect in current perpendicular to the plane (CPP) geometry. As an experimental approach, we decided the magnetoresistance coefficients in the Doring’s formula for Ni-Co-Fe binary alloy single crystal thin films and deduced an optimum crystal orientation for CPP-AMR. As a theoretical approach, we developed an AMR theory based on s-d scattering mechanism and its application methodology for practical magnetic materials. The availability of our theory was confirmed through the comparison with experimental results of iron-nitride and Co based full-Heusler alloy thin films.

Academic Significance and Societal Importance of the Research Achievements

AMR効果は約160年前のケルヴィン卿による発見以来、強磁性体で観測される重要な電流磁気効果として現象論の範疇で理解され、様々なデバイス応用がなされてきたが、1970年代の先駆的な理論研究を除いて、電子論的観点からの十分な理解は得られていなかった。本研究は実験と理論の両面からAMR効果について検討を行った結果、極薄単結晶強磁性薄膜の磁気輸送特性の解明と応用に新たな一歩を与えたものである。

Report

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

    (12 results)

All 2023 2022 2020 Other

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

  • [Journal Article] Compositional dependence of anisotropic magnetoresistance effects in Weyl semimetal Co2MnAl Heusler alloy epitaxial thin films2022

    • Author(s)
      T. Sato, S. Kokado, H. Shinya, M. Tsujikawa, A. Miura, S. Kosaka, T. Ogawa, M. Shirai, and M. Tsunoda
    • Journal Title

      Journal of Applied Physics

      Volume: 132 Issue: 22 Pages: 223907-223907

    • DOI

      10.1063/5.0128562

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Theoretical Study on Anisotropic Magnetoresistance Effects of Arbitrary Directions of Current and Magnetization for Ferromagnets: Application to Transverse Anisotropic Magnetoresistance Effect2022

    • Author(s)
      S.Kokado and M.Tsunoda
    • Journal Title

      Journal of Physical Society of Japan

      Volume: 91 Issue: 4

    • DOI

      10.7566/jpsj.91.044701

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Theoretical Study on Anisotropic Magnetoresistance Effect for Weak Ferromagnets with a Crystal Field of Tetragonal Symmetry2020

    • Author(s)
      Satoshi Kokado, Masakiyo Tsunoda
    • Journal Title

      Materials Today: Proceedings

      Volume: 33 Pages: 1864-1868

    • DOI

      10.1016/j.matpr.2020.05.224

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] Theoretical Study on In-Plane, Out-of-Plane, and Transverse Anisotropic Magnetoresistance Effects for Ferromagnetic Films2023

    • Author(s)
      Satoshi Kokado and Masakiyo Tsunoda
    • Organizer
      2nd International Meet on Magnetism and Magnetic Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Theoretical Study on Anisotropic Magnetoresistance Effect for Ferromagnets2020

    • Author(s)
      Satoshi Kokado and Masakiyo Tsunoda
    • Organizer
      Virtual International Transdisciplinary Conference [ Vellore Institute of Technology, India (On-line) ]
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research / Invited
  • [Book] スピントロニクスハンドブック2023

    • Author(s)
      スピントロニクスハンドブック編集会、佐橋 政司、湯浅 新治、遠藤 哲郎、古門聡士、角田匡清、他
    • Total Pages
      760
    • Publisher
      エヌ・ティー・エス
    • ISBN
      9784860438425
    • Related Report
      2022 Annual Research Report
  • [Remarks] 角田研究室ホームページ

    • URL

      https://www.ecei.tohoku.ac.jp/tsunoda/

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Remarks] researchmap 角田匡清

    • URL

      https://researchmap.jp/read0180277

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Remarks] 古門研究室ホームページ

    • URL

      https://wwp.shizuoka.ac.jp/kokado/

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report
  • [Remarks] 静岡大学教員データベース 古門聡士

    • URL

      https://tdb.shizuoka.ac.jp/RDB/public/Default2.aspx?id=10335&l=0

    • Related Report
      2022 Annual Research Report 2021 Annual Research Report 2020 Annual Research Report
  • [Remarks] 東北大学研究者紹介 角田匡清

    • URL

      http://db.tohoku.ac.jp/whois/detail/2d38facafb7796ce6bea4ad4ec927cdd.html

    • Related Report
      2020 Annual Research Report
  • [Remarks] 古門研究室ホームページ

    • URL

      https://wwp.shizuoka.ac.jp/kokado

    • Related Report
      2020 Annual Research Report

URL: 

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

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