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Development of magnetic tunnel junctions having high perpendicular anisotropy field and study of its spin orbit torque.

Research Project

Project/Area Number 17K14103
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Applied materials
Research InstitutionTohoku University

Principal Investigator

Kazuya Suzuki  東北大学, 材料科学高等研究所, 助教 (20734297)

Research Collaborator Takikawa Masahiro  
Kunimatsu Kazuma  
Kondo Yukio  
Ouardi Siham  
Project Period (FY) 2017-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Keywords垂直磁気異方性 / トンネル磁気抵抗効果 / マンガン系合金 / スピン軌道トル / 電界効果 / 高周波デバイス / テラヘルツ / 反強磁性 / スピン軌道トルク / トンネル磁気抵抗素子 / マンガン合金 / スピンエレクトロニクス / 磁性 / テラヘルツ/赤外材料・素子 / 超薄膜 / 電子・電気材料
Outline of Final Research Achievements

We developed magnetic tunnel junctions using new electrode having high perpendicular magnetic anisotropy field over 10 T in order to realize THz operated spin -transfer-torque based oscillator/detector devices. In addition, a spin-orbit-torque assist technique for developed devices was examined in order to reduce driving current. New stacking structure of CoGa/MnGa/Mn and CoGa/Mn with PMA field exceeding 10 T were realized in this study. Furthermore, magnetization reversal of these structure by spin orbit torque were demonstrated using CoGa seed layer. These results suggests that spin orbit torque technique using CoGa seed layer can be promising for an assist technology for newly developed devices.

Academic Significance and Societal Importance of the Research Achievements

本研究により開発された10T以上の垂直磁気異方性磁界を有する超薄膜積層構造は、これまで報告されたことがなく、次世代スピントロニクスデバイスの基盤となる新材料・構造として期待される。そして、これらの超薄膜積層構造において、界面構造に起因した大きな垂直磁気異方性が見出されたが、今後、この起源の解明により界面磁気物理の理解が格段に進歩するため普遍的な学術的価値がある。また、テラヘルツ帯域の電磁波は次世代高速通信やセンシング、気体分子の検出などにおいて工学的価値があるため、本研究で開発されたTMR素子のさらなる高性能化により、高周波応用分野の産業技術への貢献が期待できる。

Report

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

    (26 results)

All 2019 2018 2017 Other

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (18 results) (of which Int'l Joint Research: 11 results) Remarks (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Magnetic Tunnel Junctions with a Nearly Zero Moment Manganese Nanolayer with Perpendicular Magnetic Anisotropy2018

    • Author(s)
      Suzuki Kazuya Z.、Kimura Shojiro、Kubota Hitoshi、Mizukami Shigemi
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 10 Issue: 50 Pages: 43305-43310

    • DOI

      10.1021/acsami.8b15606

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Perpendicular magnetic tunnel junctions with Mn-modified ultrathin MnGa layer2018

    • Author(s)
      Suzuki K. Z.、Miura Y.、Ranjbar R.、Bainsla L.、Ono A.、Sasaki Y.、Mizukami S.
    • Journal Title

      Applied Physics Letters

      Volume: 112 Issue: 6 Pages: 062402-062402

    • DOI

      10.1063/1.5002616

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tunnel magnetoresistance in ultrathin L10 MnGa/MgO perpendicular magnetic tunnel junctions2018

    • Author(s)
      K. Z. Suzuki, Y. Miura, R. Ranjbar, A. Sugihara, S. Mizukami
    • Journal Title

      Journal of Physics D: Applied Physics

      Volume: 印刷中

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Effect of Buffer Layer Annealing on the Growth of (001)-Textured MnGa Ultrathin Films With Perpendicular Magnetic Anisotropy2017

    • Author(s)
      Suzuki Kazuya Z.、Ono Atsuo、Ranjbar Reza、Sugihara Atsushi、Mizukami Shigemi
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 53 Issue: 11 Pages: 1-4

    • DOI

      10.1109/tmag.2017.2700494

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] In-plane current-induced magnetization switching in CoGa/MnGa/MgO films2017

    • Author(s)
      Takikawa Masahiro、Suzuki Kazuya Z.、Ranjbar Reza、Mizukami Shigemi
    • Journal Title

      Applied Physics Express

      Volume: 10 Issue: 7 Pages: 073004-073004

    • DOI

      10.7567/apex.10.073004

    • NAID

      210000135914

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Tunnel magnetoresistance and electric field effect on large perpendicular magnetic anisotropy observed in magnetic tunnel junctions with a nearly-zero moment Mn nano-layer electrode2019

    • Author(s)
      K. Z. Suzuki,S. Kimura, H. Kubota, S. Mizukami
    • Organizer
      2019 Joint MMM-Intermag - Washington DC
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Perpendicular magnetic anisotropy and tunnel magnetoresistance in magnetic tunnel junctions with a Mn nano-layer electrode2019

    • Author(s)
      K. Z. Suzuki,S. Kimura, H. Kubota, S. Mizukami
    • Organizer
      第66回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Perpendicular magnetic tunnel junctions using ultrathin MnxGa1-x electrode with different compositions2018

    • Author(s)
      K. Z. Suzuki, A. Ono, and S. Mizukami
    • Organizer
      第65回応用物理学会春季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Perpendicular magnetic tunnel junctions using the ultrathin electrode of D022 or L10 MnGa and the effect of the Mn modifications2018

    • Author(s)
      K. Z. Suzuki, Y. Miura, R. Ranjbar, L. Bainsla, A. Ono, Sasaki, and S. Mizukami
    • Organizer
      International Conference on Magnetism 2018 Sanfrancisco
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Perpendicular magnetic tunnel junction with strained Mn-based synthetic ferrimagnets2018

    • Author(s)
      K. Z. Suzuki and S. Mizukami
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Lattice distortion of L10-MnGa ultrathin films grown on CoGa templates2018

    • Author(s)
      K. Kunimatsu, K. Z. Suzuki, S. Mizukami
    • Organizer
      第79回応用物理学会秋季学術講演会
    • Related Report
      2018 Annual Research Report
  • [Presentation] Magnetic tunnel junctions using strained L10-ordered MnGa electrodes2018

    • Author(s)
      K. Z. Suzuki, R. Ranjbar, J. Okabayashi, Y. Miura, A. Sugihara, H. Tsuchiura, and S. Mizukami
    • Organizer
      Kick-off Symposium for World Leading Research Centers
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Perpendicular magnetic tunnel junctions using ultrathin MnxGa1-x electrode with different compositions2018

    • Author(s)
      K. Z. Suzuki, A. Ono, and S. Mizukami
    • Organizer
      JSAP spring meeting
    • Related Report
      2017 Research-status Report
  • [Presentation] Highly (001)-textured Mn-Ga polycrystalline ultrathin films with a perpendicular magnetic anisotropy2017

    • Author(s)
      Atsuo Ono, Kazuya Z. Suzuki, Reza Ranjbar, Atsushi Sugihara, and Shigemi Mizukami
    • Organizer
      Intermag 2017 Dublin
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Thickness and annealing temperature dependence of magnetic tunnel junctions using ultra-thin MnGa electrode2017

    • Author(s)
      K. Z. Suzuki, R. Ranjbar, A. Sugihara and S. Mizukami
    • Organizer
      Intermag 2017 Dublin
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Perpendicular magnetic tunnel junctions using ultrathin MnGa electrodes2017

    • Author(s)
      Kazuya Suzuki, Reza Ranjbar, Shigemi Mizukami
    • Organizer
      TMRC 2017, Tsukuba
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Current-induced switching in paramagnetic-CoGa buffer / L10 MnGa / MgO structure with a perpendicular magnetic anisotropy2017

    • Author(s)
      Masahiro Takikawa, Kazuya Z. Suzuki, Reza Ranjbar, and Shigemi Mizukami
    • Organizer
      SSDM 2017, Sendai
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Enhancement of spin-dependent transport in magnetic tunnel junctions with Mn-modified ultrathin MnGa electrodes2017

    • Author(s)
      K. Z. Suzuki, R. Ranjbar, Lakhan Bainsla, Atsuo Ono, Yuta Sasaki, J. Okabayashi, Y. Miura, and S. Mizukami
    • Organizer
      JSAP autumn meeting
    • Related Report
      2017 Research-status Report
  • [Presentation] Current induced magnetization switching of perpendicularly magnetized ultrathin L10-MnGa films2017

    • Author(s)
      M. Takikawa,K. Z. Suzuki,R. Ranjbar,S. Mizukami
    • Organizer
      JSAP autumn meeting
    • Related Report
      2017 Research-status Report
  • [Presentation] Perpendicular magnetic tunnel junctions using ultra-thin Mn-based electrodes2017

    • Author(s)
      Kazuya Z. Suzuki, Reza Ranjbar, Lakhan Bainsla, Atsuo Ono, Yuta Sasaki, Yoshio Miura, and Shigemi Mizukami
    • Organizer
      International Symposium on Spintronic Memory, Circuit and Storage
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Enhancement of tunnel magnetoresistance and perpendicular magnetic anisotropy in magnetic tunnel junctions with Mn-modified MnGa electrodes2017

    • Author(s)
      Kazuya Z. Suzuki, Reza Ranjbar, Lakhan Bainsla, Atsuo Ono, Yuta Sasaki, Jun Okabayashi, Yoshio Miura, and Shigemi Mizukami
    • Organizer
      MMM conference, Pittsburg, US
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] Current-induced switching of perpendicularly magnetized CoGa / L10 MnGa / MgO structures2017

    • Author(s)
      M. Takikawa ,K. Z. Suzuki,R. Ranjbar,S. Mizukami
    • Organizer
      MMM conference, Pittsburg, US
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] High perpendicular magnetic anisotropy in D022 MnGa-based Heusler ultrathin films2017

    • Author(s)
      Siham Ouardi, Kazuya Z. Suzuki, and Shigemi Mizukami
    • Organizer
      MMM conference, Pittsburg, US
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Remarks] 東北大学材料科学高等研究所水上研究室

    • URL

      https://www.wpi-aimr.tohoku.ac.jp/mizukami_lab/

    • Related Report
      2018 Annual Research Report
  • [Patent(Industrial Property Rights)] 磁気素子、磁気記憶装置及び発振装置2017

    • Inventor(s)
      鈴木和也 水上成美
    • Industrial Property Rights Holder
      鈴木和也 水上成美
    • Industrial Property Rights Type
      特許
    • Filing Date
      2017
    • Related Report
      2017 Research-status Report
  • [Patent(Industrial Property Rights)] 磁気素子、磁気記憶装置及び発振装置2017

    • Inventor(s)
      鈴木和也 水上成美
    • Industrial Property Rights Holder
      鈴木和也 水上成美
    • Industrial Property Rights Type
      特許
    • Filing Date
      2017
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2020-03-30  

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