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Fabrication of artificial multilayer using ferromagnetic oxide and its application to voltage-driven memory devices

Research Project

Project/Area Number 19K15044
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 21060:Electron device and electronic equipment-related
Research InstitutionNagoya University

Principal Investigator

Oshima Daiki  名古屋大学, 未来材料・システム研究所, 特任助教 (60736528)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords強磁性絶縁体 / 電圧印加 / 垂直磁気異方性 / スピントロニクス / Niフェライト / 人工積層膜 / 電圧駆動
Outline of Research at the Start

現在のスピントロニクスデバイスにおいては,電流誘起の磁化反転手法が主流であるが,省電力化のためには電圧誘起の磁化反転手法が望ましい.本研究課題では,電圧誘起磁化反転手法に適する材料として,【強磁性絶縁体 / 強磁性金属 / 非磁性金属】の繰り返し構造を有する人工積層膜を提案し,その基礎的特性・動作に関する研究を行う.

Outline of Final Research Achievements

For application to voltage-driven magnetic memories, ferromagnetic-oxide / ferromagnetic-metal / nonmagnetic metal repetition layer structure was fabricated by magnetron sputtering method, and the magnetic property and the crystal structure of the samples were evaluated. Zn ferrite, used as a ferromagnetic-oxide, was epitaxially grown on ferromagnetic FeCo / nonmagnetic W buffer layers. Perpendicular magnetic anisotropy, which is important for memory applications, was confirmed in the repetition multilayer. There is the possibility that the proposed structure is available in the magnetic memories.

Academic Significance and Societal Importance of the Research Achievements

現在、電圧駆動メモリデバイスの基本構造は強磁性金属/非磁性絶縁体の構造であるが、その構造では繰り返し積層して体積を増やしていくことは難しいと考えられる。一方、全てが磁気的に結合した強磁性絶縁体/強磁性金属/非磁性金属構造が実現できれば、繰り返し回数を大きくしてもメモリ機能は維持できると考えられる。本研究期間内では、電圧による磁気特性の変調を確認するまでには至れなかったが、提案する構造において、結晶成長すること、目標とする磁気特性を得ることに成功した。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2020 2019

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (10 results) (of which Int'l Joint Research: 5 results)

  • [Journal Article] MnGa Film with (001) Texture Fabricated on Thermally Oxidized Si Substrate Using CoGa Buffer Layer2020

    • Author(s)
      Miwa Y.、Oshima D.、Kato T.、Iwata S.
    • Journal Title

      Journal of the Magnetics Society of Japan

      Volume: 44 Issue: 5 Pages: 117-121

    • DOI

      10.3379/msjmag.2009r003

    • NAID

      130007895397

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Highly (001) oriented MnAl thin film fabricated on CoGa buffer layer2020

    • Author(s)
      Oshima Daiki、Kato Takeshi、Iwata Satoshi
    • Journal Title

      AIP Advances

      Volume: 10 Issue: 2 Pages: 025012-025012

    • DOI

      10.1063/1.5130452

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Thermally assisted STT switching of hybrid memory layer consisting of low TC CoPd/Pd and high TC Co/Pd multilayers2020

    • Author(s)
      W. Zhao, T. Kato, D. Oshima, Y. Sonobe, S. Takahashi, S. Iwata
    • Organizer
      IEEE International Magnetics Conference 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Perpendicular anisotropy and damping of MgO/Fe/Au trilayers with broken inversion symmetry2020

    • Author(s)
      N. Kamiya, T. Kato, D. Oshima, S. Iwata
    • Organizer
      Annual Conference on Magnetism and Magnetic Materials 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] [CoPd/Pd]/[Co/Pd]ハイブリッドメモリ層の熱アシスト2020

    • Author(s)
      趙望臻,加藤剛志,大島大輝,園部義明,高橋茂樹,岩田聡
    • Organizer
      第44回日本磁気学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] MgO/Co/Pt積層膜における磁気異方性およびダンピング定数の電界効果2020

    • Author(s)
      砂古口藍子,大島大輝,岩田聡,加藤剛志
    • Organizer
      第44回日本磁気学会学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Electric-field-assisted Spin Hall Magnetization Switching in MgO/Co/Pt Trilayers2019

    • Author(s)
      K. Kunishima, X. Zhou, D. Oshima, T. Kato, S. Iwata
    • Organizer
      Magnetics and Optics Research International Symposium 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Voltage control of spin Hall switching in perpendiculary magnetized MgO/Co/Pt trilayers2019

    • Author(s)
      K. Kunishima, X. Zhou, D. Oshima, T. Kato, S. Iwata
    • Organizer
      International Conference on Materials and Systems for Sustainability 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] MgO/Co/Pt積層膜における電界アシストスピン軌道トルク磁化反転2019

    • Author(s)
      國島和哉, 周興, 大島大輝, 加藤剛志, 岩田聡
    • Organizer
      第43回日本磁気学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] CoGa下地層を用いたMnAl(001)配向膜の形成2019

    • Author(s)
      大島大輝,加藤剛志,岩田聡
    • Organizer
      第43回日本磁気学会学術講演会
    • Related Report
      2019 Research-status Report
  • [Presentation] 熱処理したFe3O4/Crスパッタ積層膜の垂直磁気異方性2019

    • Author(s)
      大島大輝,加藤剛志,岩田聡
    • Organizer
      電気学会マグネティックス研究会
    • Related Report
      2019 Research-status Report
  • [Presentation] Highly (001) oriented MnAl film fabricated on CoGa buffer layer2019

    • Author(s)
      D. Oshima, T. Kato, S. Iwata
    • Organizer
      Annual Conference on Magnetism and Magnetic Materials 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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