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Fablication of novel spintronic devices using MTJs with magnetic insulators

Research Project

Project/Area Number 23686006
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Applied materials science/Crystal engineering
Research InstitutionHokkaido University

Principal Investigator

NAGAHAMA Taro  北海道大学, 工学(系)研究科(研究院), 准教授 (20357651)

Project Period (FY) 2011-11-18 – 2014-03-31
Project Status Completed (Fiscal Year 2013)
Budget Amount *help
¥10,530,000 (Direct Cost: ¥8,100,000、Indirect Cost: ¥2,430,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2012: ¥9,100,000 (Direct Cost: ¥7,000,000、Indirect Cost: ¥2,100,000)
Keywordsスピントロニクス / フェライト / トンネル磁気抵抗効果 / スピン流 / スピネルフェライト / スピントルク / スピンエレクトロニクス / 磁性 / MBE・エピタキシャル / 先端機能デバイス
Research Abstract

In the spintronics research fields, MRAM and STT-RAM have attracted much attention. In the devices, magnetic tunnel junctions (MTJs) are the most impotant elements. The STT-RAM employs the spin torque transfer magnetization reversal to switch the magnetization on very low power. In 2010, Slonczewski proposed that the magnetization is reversed effectively by the spin current generated by spin wave in magnetic insulator. However, the MTJs with magnetic oxide insulator are not reported so far. In this study, we fabricated the epitaxial MgO-MTJs with spinel ferrite oxide using reactive molecular beam epitaxy.From the RHEED and AFM observations, Pt is more appropriate for the insertion layer between Fe and ferrite layers than Cr and Au. Regarding the magnetization process, the saturation field was enhanced by insertion of the non-magnetic layer. The MTJ devices fabricated by e-beam lithography exhibited TMR effects of 70%.

Report

(4 results)
  • 2013 Annual Research Report   Final Research Report ( PDF )
  • 2012 Annual Research Report
  • 2011 Annual Research Report
  • Research Products

    (19 results)

All 2013 2012

All Presentation (19 results) (of which Invited: 3 results)

  • [Presentation] Progress of Magnetic Tunnel Junctions―Connection between Charge and Spin―2013

    • Author(s)
      Taro Nagahama
    • Organizer
      The 14th RIES-Hokudai Iinternational Symposium
    • Place of Presentation
      CHÂTERAISÉ Gateaux Kingdom Sapporo, Japan
    • Year and Date
      2013-12-12
    • Related Report
      2013 Final Research Report
    • Invited
  • [Presentation] Magnetic properties of epitaxial Fe_3O_4 with various crystal orientations2013

    • Author(s)
      T. Nagahama, K. Tate, Y. Matsuda, N. Takahashi, T. Shimada
    • Organizer
      MMM2013
    • Place of Presentation
      Denver, Colorado, USA
    • Year and Date
      2013-11-08
    • Related Report
      2013 Final Research Report
  • [Presentation] The interlayer exchange coupling in CoFe2O4/Cr/Fe systems2013

    • Author(s)
      川井智博,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第60回応用物理学会春季学術講演会
    • Place of Presentation
      神奈川工科大学厚木市(神奈川県)
    • Year and Date
      2013-03-27
    • Related Report
      2013 Final Research Report
  • [Presentation] Fabrication of Fe3O4/Al2O3/Fe and Fe3O4/CoCr2O4/Fe tunnel junctions2013

    • Author(s)
      松田悠弥,楯和也,高橋望,長浜太郎,島田敏宏
    • Organizer
      第60回応用物理学会春季学術講演会
    • Place of Presentation
      神奈川工科大学厚木市(神奈川県)
    • Year and Date
      2013-03-27
    • Related Report
      2013 Final Research Report
  • [Presentation] CoFe_2O_4/Cr/Fe系の磁化過程のCr膜厚依存性2013

    • Author(s)
      川井智博,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第37回日本磁気学会学術講演会
    • Place of Presentation
      北海道大学札幌市
    • Related Report
      2013 Final Research Report
  • [Presentation] MgO-MTJ/Pt/CoFe_2O_4の作製と磁気伝導特性2013

    • Author(s)
      高橋望,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第37回日本磁気学会学術講演会
    • Place of Presentation
      北海道大学札幌市
    • Related Report
      2013 Final Research Report
  • [Presentation] CoCr_2O_4スピネルを用いたトンネル磁気抵抗素子の作製2013

    • Author(s)
      楯和也,松田悠弥,長浜太郎,島田敏宏
    • Organizer
      第37回日本磁気学会学術講演会
    • Place of Presentation
      北海道大学札幌市
    • Related Report
      2013 Final Research Report
  • [Presentation] The Fabrication of Magnetic Tunnel Junctions Including Spinel Ferrite Layers by Molecular Beam Epitaxy2013

    • Author(s)
      Taro Nagahama, Yuya Matsuda, Kazuya Tate, Toshihiro Shimada
    • Organizer
      11th International Conferenence on Ferrites
    • Place of Presentation
      Okinawa Convention Center, Ginowan, Okinawa Prefecture, Japan
    • Related Report
      2013 Final Research Report
  • [Presentation] The Fabrication of Magnetic Tunnel Junctions Including Spinel Ferrite Layers by Molecular Beam Epitaxy2013

    • Author(s)
      Taro Nagahama, Yuya Matsuda, Kazuya Tate, Toshihiro Shimada
    • Organizer
      11th International Conferenence on Ferrites
    • Place of Presentation
      Okinawa Convention Center, Ginowan
    • Related Report
      2013 Annual Research Report
  • [Presentation] CoFe2O4/Cr/Fe 系の磁化過程のCr膜厚依存性2013

    • Author(s)
      川井智博,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第37回 日本磁気学会学術講演会
    • Place of Presentation
      北海道大学  札幌市
    • Related Report
      2013 Annual Research Report
  • [Presentation] MgO-MTJ/Pt/CoFe2O4 の作製と磁気伝導特性2013

    • Author(s)
      高橋 望,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第37回 日本磁気学会学術講演会
    • Place of Presentation
      北海道大学 札幌市
    • Related Report
      2013 Annual Research Report
  • [Presentation] CoCr2O4スピネルを用いたトンネル磁気抵抗素子の作製2013

    • Author(s)
      楯 和也,松田悠弥,長浜太郎,島田敏宏
    • Organizer
      第37回 日本磁気学会学術講演会
    • Place of Presentation
      北海道大学 札幌市
    • Related Report
      2013 Annual Research Report
  • [Presentation] Progress of Magnetic Tunnel Junctions ―Connection between Charge and Spin―2013

    • Author(s)
      Taro Nagahama
    • Organizer
      THE 14th RIES-HOKUDAI INTERNATIONAL SYMPOSIUM
    • Place of Presentation
      CHATERAISE Gateaux Kingdom, Sapporo
    • Related Report
      2013 Annual Research Report
    • Invited
  • [Presentation] Magnetic properties of epitaxial Fe3O4 with various crystal orientations2013

    • Author(s)
      T. Nagahama, K. Tate, Y. Matsuda, N. Takahashi, T. Shimada
    • Organizer
      58TH ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS (MMM2013)
    • Place of Presentation
      Sheraton Denver Downtown, Denver, USA
    • Related Report
      2013 Annual Research Report
  • [Presentation] The interlayer exchange coupling in CoFe2O4/Cr/Fe systems2013

    • Author(s)
      川井智博,平谷俊悟,長浜太郎,島田敏宏
    • Organizer
      第60回応用物理学会春季学術講演会
    • Place of Presentation
      神奈川工科大 厚木市
    • Related Report
      2012 Annual Research Report
  • [Presentation] Fabrication of Fe3O4/Al2O3/Fe and Fe3O4/CoCr2O4/Fe tunnel junctions2013

    • Author(s)
      松田悠弥,楯 和也,高橋 望,長浜太郎,島田敏宏
    • Organizer
      第60回応用物理学会春季学術講演会
    • Place of Presentation
      神奈川工科大 厚木市
    • Related Report
      2012 Annual Research Report
  • [Presentation] Fabrication of epitacial films of magnetic spinel materials by molecular beam epitaxy method2012

    • Author(s)
      T. Nagahama, Y. Matsuda, K. Tate, S. Hiratani, Y. Watanabe, T. Shimada
    • Organizer
      ICAUMS2012
    • Place of Presentation
      Nara Prefectural New Public Hall, Nara
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
    • Invited
  • [Presentation] Magnetic property and magnetoconductance of high-quality Fe3O4 epitaxial film2012

    • Author(s)
      Y. Matsuda, K. Tate, S. Hiratani, Y. Watanabe, T. Nagahama, T. Shimada
    • Organizer
      ICAUMS2012
    • Place of Presentation
      Nara Prefectural New Public Hall, Nara
    • Related Report
      2013 Final Research Report 2012 Annual Research Report
  • [Presentation] Magnetic properties of epitaxial spinel CoCr2O4 films grown by molecular beam epitaxy(MBE)2012

    • Author(s)
      K. Tate, T. Nagahama, T. Shimada
    • Organizer
      ICAUMS2012
    • Place of Presentation
      Nara Prefectural New Public Hall, Nara
    • Related Report
      2013 Final Research Report 2012 Annual Research Report

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Published: 2013-05-15   Modified: 2019-07-29  

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