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Enhanced Functionality of Tunnel Magnetoresistive Devices by Interface Control of Fe3O4/Insulators

Research Project

Project/Area Number 18H01465
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 InstitutionHokkaido University

Principal Investigator

Nagahama Taro  北海道大学, 工学研究院, 准教授 (20357651)

Co-Investigator(Kenkyū-buntansha) 岡林 潤  東京大学, 大学院理学系研究科(理学部), 准教授 (70361508)
本多 周太  関西大学, システム理工学部, 准教授 (00402553)
Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥17,680,000 (Direct Cost: ¥13,600,000、Indirect Cost: ¥4,080,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥9,880,000 (Direct Cost: ¥7,600,000、Indirect Cost: ¥2,280,000)
Keywordsマグネタイト / 強磁性トンネル接合 / トンネル磁気抵抗効果 / スピントロニクス / Fe3O4 / XMCD / ハーフメタル
Outline of Final Research Achievements

Fe3O4 is predicted to be a half-metal material with negative spin polarization. However, magnetic tunnel junctions (MTJs) using an Fe3O4 electrode exhibit a small tunnel magnetoresistance (TMR) effect, the sign of which has not been established experimentally. In this study, we fabricated fully epitaxial MTJs using Fe3O4 on MgO (001) substrates and find a large inverse TMR ratio of -55.8% at 80 K, which corresponds to 126% by the optimistic definition of the TMR ratio. Moreover, we investigate the dependence of TMR on oxygen partial pressure during Fe3O4 deposition. It is found that the magneto-transport properties of the MTJs show different behaviors depending on the oxygen partial pressure because the Verwey transition is sensitive to the oxygen concentration.

Academic Significance and Societal Importance of the Research Achievements

Fe3O4は第一原理計算により-100%のスピン分極を持つハーフメタルであると予測されており、スピン分解光電子分光などの分光学的な測定では大きなスピン分極率が得られていた。今回これまで示されていなかったトンネル磁気抵抗化における高いスピン分極率が実験的に示されたことは、酸化物磁性体の界面電子物性を調べる上で、学術的に重要な成果と言える。また、スピントロニクス応用の根幹であるTMR効果で大きな値が得られたことは、今後の酸化物を用いたスピントロニクス応用への道をひらく研究成果であり、本分野の今後の発展が期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • Research Products

    (28 results)

All 2021 2020 2019 2018 Other

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 6 results) Presentation (21 results) (of which Int'l Joint Research: 9 results,  Invited: 1 results) Remarks (1 results)

  • [Journal Article] Large Inverse Tunnel Magnetoresistance in Magnetic Tunnel Junctions with an Fe3O4 Electrode2021

    • Author(s)
      Yasui Shoma、Honda Syuta、Okabayashi Jun、Yanase Takashi、Shimada Toshihiro、Nagahama Taro
    • Journal Title

      Physical Review Applied

      Volume: 15 Issue: 3 Pages: 034042-034042

    • DOI

      10.1103/physrevapplied.15.034042

    • NAID

      120007126036

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] NiCo2O4 films fabricated by reactive molecular beam epitaxy and annealing in various oxygen atmospheres2020

    • Author(s)
      Tsujie Asaka、Hara Yoshinori、Yanase Takashi、Shimada Toshihiro、Nagahama Taro
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 23 Pages: 232404-232404

    • DOI

      10.1063/5.0008677

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Controlling the magnetic proximity effect and anomalous Hall effect in CoFe2O4/Pt by ionic gating2020

    • Author(s)
      Nodo Shoto、Ono Shimpei、Yanase Takashi、Shimada Toshihiro、Nagahama Taro
    • Journal Title

      Applied Physics Express

      Volume: 13 Issue: 6 Pages: 063004-063004

    • DOI

      10.35848/1882-0786/ab92f1

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Characterization of magnetic properties of ultrathin CoFe204 films by utilizing magnetic proximity effect2020

    • Author(s)
      S. Nodo, T. Yamamoto, T. Yanase, T. Shimada, T. Nagahama
    • Journal Title

      Solid State Communications

      Volume: 306 Pages: 113762-113762

    • DOI

      10.1016/j.ssc.2019.113762

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Interfacial ferromagnetism and atomic structures in high-temperature grown Fe3O4/Pt/Fe3O4 epitaxial trilayers2019

    • Author(s)
      Kikkawa T.、Suzuki M.、Ramos R.、Aguirre M. H.、Okabayashi J.、Uchida K.、Lucas I.、Anadon A.、Kikuchi D.、Algarabel P. A.、Morellon L.、Ibarra M. R.、Saitoh E.
    • Journal Title

      Journal of Applied Physics

      Volume: 126 Issue: 14 Pages: 143903-143903

    • DOI

      10.1063/1.5125761

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Local electronic and magnetic properties of ferro-orbital-ordered FeV2O42018

    • Author(s)
      J. Okabayashi, S. Miyasaka, M. Takahashi, S. Tajima
    • Journal Title

      Jpn J. Appl. Phys.

      Volume: 57 Issue: 9 Pages: 0902BD-0902BD

    • DOI

      10.7567/jjap.57.0902bd

    • NAID

      210000149604

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Presentation] Fe3O4(001)/MgO(001)/Fe(001)強磁性トンネル接合における大きな負のTMR効果2021

    • Author(s)
      安井彰馬 本多周太 岡林潤  柳瀬隆 島田敏宏 長浜太郎
    • Organizer
      第68回応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Fe3O4/MgO/Fe磁気トンネル接合におけるトンネル磁気抵抗効果2021

    • Author(s)
      安井 彰馬, 柳瀬 隆, 島田 敏宏, 長浜 太郎
    • Organizer
      第56回応用物理学会北海道支部/第17回日本光学会北海道支部合同学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] マグネタイト強磁性トンネル接合のTMR効果の温度依存性2021

    • Author(s)
      安井彰馬, 柳瀬隆, 島田敏宏, 長浜太郎
    • Organizer
      強的秩序とその操作に関わる第12回 講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Large TMR Effect of Magnetic Tunnel Junctions with Fe3O42021

    • Author(s)
      Taro Nagahama, Shoma Yasui, Takashi Yanase, Toshihiro Shimada
    • Organizer
      Taro Nagahama1*, Shoma Yasui2, Takashi Yanase1, and Toshihiro Shimada
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 反応性MBEで作製したNiCo2O4のアニール時酸素分圧依存性2020

    • Author(s)
      辻榮朝香, 原 吉典, 柳瀬 隆, 島田敏宏, 長浜 太郎
    • Organizer
      第81回応用物理学会秋季講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] NiCo2O4 Thin Films Prepared by Reactive Molecular Beam Epitaxy and Annealing under High Pressure Oxygen Atmosphere2020

    • Author(s)
      Asaka Tsujie, Yoshinori Hara, Takashi Yanase, Toshihiro Shimada, Taro Nagahama
    • Organizer
      65th Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Voltage Control of Magnetic Proximity Effect and Anomalous Hall Effect in CoFe2O4/Pt Bilayer by Ionic Liquid Gating2020

    • Author(s)
      S. Nodo, S. Ono, T. Yanase, T. Shimada, T. Nagahama
    • Organizer
      65th Annual Conference on Magnetism and Magnetic Materials
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fe3O4(001)/MgO(001)/Fe(001)強磁性トンネル接合における 負のトンネル磁気抵抗効果2019

    • Author(s)
      安井彰馬、岡林潤、島田敏宏、柳瀬隆、長浜太郎
    • Organizer
      第43回日本磁気学会学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Inverse tunneling magnetoresistance in Fe3O4/MgO/Fe epitaxial magnetic tunnel junction2019

    • Author(s)
      Shoma Yasui, Jun Okabayashi, Toshihiro Shimada, Takashi Yanase, Taro Nagahama
    • Organizer
      応用物理学会第80回秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] The crystal structure and magneto-transport properties of NixCo3-xO4 films2019

    • Author(s)
      Asaka Tsujie, Andrea Fernandez , Lora Veneracion, Takashi Yanase , Toshihiro Shimada, Taro Nagahama
    • Organizer
      第80回応用物理学会秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Controlling magnetic proximity effect in CoFe2O4/Pt by applying voltage on Pt layer2019

    • Author(s)
      Shoto Nodo, Takumi Yamamoto, Takashi Yanase, Toshihiro Shimada, Taro Nagahama
    • Organizer
      応用物理学会第80回秋季学術講演会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Tunnel magnetoresistance effect of magnetic tunnel junction with Fe3O4(001) electrodes grown by reactive MBE2019

    • Author(s)
      S. Yasui,J. Okabayashi, T. Shimada, T. Yanase, T. Nagahama
    • Organizer
      The 3rd Functional Matrial Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Epitaxial Growth of NiCo2O4 Films by Reactive Molecular Beam Epitaxy Method2019

    • Author(s)
      Asaka Tsujie、Takashi Yanase、Toshihiro Shimada、Taro Nagahama
    • Organizer
      The 3rd Functional Matrial Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ionic liquid gating control of magnetic proximity effect in CoFe2O4/Pt bilayer2019

    • Author(s)
      S. Nodo, T. Yamamoto, T. Yanase, T.Shimada, and T. Nagahama
    • Organizer
      The 3rd Functional Matrial Symposium
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Large tunnel magnetoresistance effects in Fe3O4(001)/MgO(001)/Fe(001) epitaxial magnetic tunnel junctions2019

    • Author(s)
      S. Yasui, J. Okabayashi, T. Yanase, T. Shimada and T. Nagahama
    • Organizer
      64th annual conference on magnetism and mamgnetic materials
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Fabrication of metastable B2-type Fe1-xSnx epitaxial films on MgO(001) substrates2019

    • Author(s)
      Y. Goto, M. Araki, N. Takahashi, T. Yanase, T. Shimada, M. Tsujikawa, M. Shirai, A. Kamimaki, S. Iihama, S. Mizukami and T. Nagahama
    • Organizer
      2019 Joint MMM-Intermag
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] メスバウアー分光にて軌道角運動量を捉えられるか2019

    • Author(s)
      岡林 潤
    • Organizer
      強的秩序とその操作に関わる研究グループ 第8回 研究会
    • Related Report
      2018 Annual Research Report
  • [Presentation] The crystal structure and magnetotransport properties of CoxFe3-xO4 films and CoxFe3-xO4 / MgO or AlOx / FePt multilayers2018

    • Author(s)
      Asaka Tsujie、Takashi Yanase、Toshihiro Shimada、Taro Nagahama
    • Organizer
      応用物理学会第79回秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 磁気近接効果を用いたPt/CoFe2O4超薄膜の磁気特性評価2018

    • Author(s)
      野土翔登,山本 匠,柳瀬 隆,島田敏宏,長浜太郎
    • Organizer
      第42回日本磁気学会学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] 軌道秩序を示すFeV2O4の構造と磁性と軌道状態2018

    • Author(s)
      岡林潤, 宮坂茂樹
    • Organizer
      XAFS討論会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Probing orbital magnetic moments by Mossbauer and x-ray absorption spectroscopies in FeV2O42018

    • Author(s)
      Jun Okabayashi
    • Organizer
      4th Mediterranean Conference on the Applications of the Moessbauer Effect
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Remarks] 酸化鉄で巨大な負のトンネル磁気抵抗効果を実現~酸化物スピントロニクスの実現に道筋~

    • URL

      https://www.hokudai.ac.jp/news/2021/03/post-815.html

    • Related Report
      2020 Annual Research Report

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Published: 2018-04-23   Modified: 2022-01-27  

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