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Magnetic anisotropy control by coherency strains in element-added magnetite thin films

Research Project

Project/Area Number 17K06806
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Inorganic materials/Physical properties
Research InstitutionResearch Institute for Electromagnetic Materials

Principal Investigator

Watanabe Masato  公益財団法人電磁材料研究所, その他部局等, 研究員(移行) (40249975)

Co-Investigator(Kenkyū-buntansha) 阿部 世嗣  公益財団法人電磁材料研究所, その他部局等, 研究員(移行) (20202666)
Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywordsマグネタイト / 垂直磁気異方性 / エピタキシャル薄膜 / 整合歪み / ハーフメタル / スパッタリング / 整合ひずみ / 垂直磁化 / エピタキシャル成長 / 磁気異方性 / エピタキシャル / 磁性 / 超薄膜 / 電子・電気材料
Outline of Final Research Achievements

Magnetite Fe3O4 has been expected to be applied to various spin-devices due to its half-metallicity that leads to availability as spin-polarized electron source. Since it is expected that the change in crystal symmetry caused by coherency strain, which is accompanied with epitaxial growth, brings an increase in uniaxial magnetic anisotropy, I studied sputtered Fe3O4 epitaxial thin films, and found that (111)-oriented Fe3O4 epitaxial thin films are perpendicularly magnetized films, of which perpendicular magnetic anisotropy energy is about 1.5 E+06 erg/cc, which is larger than K1 of bulk magnetite. The obtained results are considered to be useful for spin-devices that require perpendicular magnetization such as STT-MRAM.

Academic Significance and Societal Importance of the Research Achievements

磁気異方性制御は、永久磁石、磁気記録媒体、スピンデバイスなど磁性の各種応用上重要な研究課題である。本研究では、単結晶基板との格子定数差(ミスフィット)によって生じる整合歪みによるマグネタイト薄膜の磁気異方性制御の可能性について検討を行った結果、ミスフィットが7%と比較的大きなSrTiO3(111)上に成長させた薄膜がバルクよりも一桁以上大きな垂直磁気異方性を有する垂直磁化膜となることを確認した。マグネタイトはハーフメタルであることから、垂直磁気異方性が要求されるスピンデバイス材料としての可能性が期待される。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 2017

All Journal Article (2 results) (of which Peer Reviewed: 2 results,  Open Access: 2 results) Presentation (3 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Structural and magnetic properties in sputtered iron oxide epitaxial thin films - Magnetite Fe3O4 and epsilon ferrite ε-Fe2O3 -2019

    • Author(s)
      Masato Watanabe
    • Journal Title

      Determination in Nanomedicine and Nanotechnology

      Volume: 1

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Structural and magnetic properties in sputtered iron oxide epitaxial thin films -Magnetite Fe3O4 and epsilon ferrite epsilon-Fe2O3-2019

    • Author(s)
      Masato Watanabe
    • Journal Title

      Determinations in Nanomedicine & Nanotechnology

      Volume: 1

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Fe3O4/SrTiO3(111)スパッタエピタキシャル膜の垂直磁気異方性2019

    • Author(s)
      渡邉 雅人
    • Organizer
      第43回日本磁気学会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Structural and magnetic properties in iron oxide epitaxial thin films2018

    • Author(s)
      Masato Watanabe
    • Organizer
      2nd International Conference on Magnetism and Magnetic Materials
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] マグネタイトFe3O4エピタキシャルスパッタ薄膜の構造と磁気特性2017

    • Author(s)
      渡邉 雅人
    • Organizer
      日本金属学会
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] マグネタイト薄膜および磁気トンネル接合素子2019

    • Inventor(s)
      渡邉 雅人
    • Industrial Property Rights Holder
      公益財団法人電磁材料研究所
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2019-158124
    • Filing Date
      2019
    • Related Report
      2019 Annual Research Report

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Published: 2017-04-28   Modified: 2021-03-11  

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