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Enhancement of spin orbit torque by introducing the broken inversion symmetry and development of 3-dimensional magenetic memory

Research Project

Project/Area Number 20H02182
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 InstitutionNagoya University

Principal Investigator

Kato Takeshi  名古屋大学, 未来材料・システム研究所, 教授 (50303665)

Co-Investigator(Kenkyū-buntansha) 大島 大輝  名古屋大学, 工学研究科, 助教 (60736528)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2021: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2020: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Keywords電子・電気材料 / 磁性材料 / スピントロニクス
Outline of Research at the Start

スピン軌道トルク(SOT)磁化反転は磁性層に隣接する非磁性層に電流を流すことで磁化反転を行なうもので,既存のスピン移行トルク(STT)磁化反転に比べ1/5程度の消費電力で10倍高速に磁化反転ができると考えら,今後のSociety 5.0を支える大容量磁気ランダムアクセスメモリ(MRAM)への応用研究が進められている.本研究は磁性材料に空間反転対称性の破れを人工的に導入することで,SOT磁化反転の高効率化を図るとともに,これを利用した3次元メモリの原理実証を行なう.

Outline of Final Research Achievements

Spin Orbit Torque (SOT) switching is considered as a promising way of the next generation writing scheme of the magnetic random access memories. This study focused on the relationship between SOT switching current density and structural inversion symmetry of the magnetic materials, and Gd/FeCo multilayers with graded layered thickness and Tb/Gd/FeCo multilayers were investigated. The SOT switching current density of Gd/FeCo multilayers decreased with increasing the gradient of the layer thickness of the multilayer. Moreover, in Tb/Gd/FeCo multilayers, the SOT switching current density decreased with increasing Tb layer thickness, even though the effective perpendicular anisotropy increased. These results suggest the increase of the broken inversion symmetry along film normal direction decreases the SOT switching current density.

Academic Significance and Societal Importance of the Research Achievements

スピン軌道トルク(Spin orbit torque: SOT)は,Society 5.0を支える大容量磁気ランダムアクセスメモリ(MRAM)の新規磁化反転手法として期待されているが,磁化反転の臨界電流密度の低減が求められている.本研究ではメモリの機能を果たす磁性膜に膜厚方向の空間反転対称性の破れを人工的に導入し,この空間対称性の破れがスピン軌道トルク磁化反転の臨界電流密度を低減する可能性があることを示した.磁性膜の空間反転対称性の破れとスピン軌道トルクとの相関は未解明な部分も多く,今後も継続的に研究を進め,MRAMの飛躍的高密度化,低消費電力化を可能とする技術を探求する必要がある.

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (25 results)

All 2023 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 8 results,  Open Access: 3 results) Presentation (15 results) (of which Int'l Joint Research: 9 results,  Invited: 2 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Fabrication of beta-Mn type CoZnMn(001) film on MgO single crystal substrate2023

    • Author(s)
      D. Oshima, R. Mitsuhashi, N. Ikarashi, T. Kato, M. Nagao
    • Journal Title

      AIP Advances

      Volume: 13 Issue: 2 Pages: 025331-025331

    • DOI

      10.1063/9.0000488

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spin Orbit Torques in Ferrimagnetic Gd/FeCo Multilayers2023

    • Author(s)
      S. Yanai, D. Oshima, S. Takahashi, Y. Hirayama, T. Kato
    • Journal Title

      Jpn. J. Appl. Phys.

      Volume: 62 Issue: SB Pages: SB1004-SB1004

    • DOI

      10.35848/1347-4065/ac8f52

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Electric-field modulation of perpendicular magnetic anisotropy and damping constant in MgO/Co/Pt trilayers2022

    • Author(s)
      A. Sakoguchi, T. Kato, D. Oshima, S. Iwata
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 58 Issue: 2 Pages: 1-5

    • DOI

      10.1109/tmag.2021.3083078

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Crystal Structure and Magnetic and Magneto-optical Properties of CoPt, MnPt<sub>3</sub>, CrPt<sub>3</sub>, MnAl and MnGa Films with Ordered Phase and Their Bit-patterned Media2021

    • Author(s)
      S. Iwata, T. Kato, D. Oshima
    • Journal Title

      Journal of the Magnetics Society of Japan

      Volume: 45 Issue: 5 Pages: 118-124

    • DOI

      10.3379/msjmag.2109RV001

    • NAID

      130008082674

    • ISSN
      1882-2924, 1882-2932
    • Year and Date
      2021-09-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Perpendicular Anisotropy and Damping of MBE-grown MgO/Fe/Au(001) and Au/Fe/Au(001) Trilayers2021

    • Author(s)
      N. Kamiya, D. Oshima, S. Iwata, T. Kato
    • Journal Title

      Journal of the Magnetics Society of Japan

      Volume: 45 Issue: 4 Pages: 96-100

    • DOI

      10.3379/msjmag.2107R005

    • NAID

      130008060703

    • ISSN
      1882-2924, 1882-2932
    • Year and Date
      2021-07-01
    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topotactic crystal structure transformation from spinel ferrite to w?stite in epitaxial Fe3O4 films via Kr ion irradiation2021

    • Author(s)
      Liu Yang、Hisamatsu Yuki、Sharmin Sonia、Oshima Daiki、Iwata Satoshi、Kato Takeshi、Sekiba Daiichiro、Kita Eiji、Yanagihara Hideto
    • Journal Title

      Journal of Vacuum Science & Technology A

      Volume: 39 Issue: 3 Pages: 033403-033403

    • DOI

      10.1116/6.0000885

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Element- and orbital-selective magnetic coherent rotation at the first-order phase transition of a hard uniaxial ferrimagnet2020

    • Author(s)
      Yamamoto Sh.、Gorbunov D. I.、Akai H.、Yasumura H.、Kotani Y.、Nakamura T.、Kato T.、Mushnikov N. V.、Andreev A. V.、Nojiri H.、Wosnitza J.
    • Journal Title

      Physical Review B

      Volume: 101 Issue: 17 Pages: 1744301-6

    • DOI

      10.1103/physrevb.101.174430

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [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
  • [Presentation] Magnetization Dynamics of GdFeCo/Cu/FeCo Trilayers Triggered by Ultrashort Pulsed Laser2022

    • Author(s)
      K. Seguchi, D. Oshima, T. Kato
    • Organizer
      Magnetics and Optics Research International Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin Orbit Torques in Ferrimagnetic Gd/FeCo Multilayers2022

    • Author(s)
      S. Yanai, D. Oshima, S. Takahashi, Y. Hirayama, T. Kato
    • Organizer
      Magnetics and Optics Research International Symposium 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Current Induced Magnetization Switching for Ultra-high Density Memory Devices2022

    • Author(s)
      T. Kato
    • Organizer
      2nd International Conference on Magnetism and Its Applications
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Fabrication of beta-Mn type CoZnMn(001) film on MgO single crystal substrate2022

    • Author(s)
      D. Oshima, R. Mitsuhashi, N. Ikarashi, T. Kato, M. Nagao
    • Organizer
      The 67th Annual Conferenc on Magnetism and Magnetic Materials
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Ta上に積層したGd/FeCo多層膜のスピン軌道トルク2022

    • Author(s)
      矢内峻介,大島大輝,高橋茂樹,平山義幸,加藤剛志
    • Organizer
      第46回日本磁気学会学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 垂直磁化SAF固定層を用いたCPP-GMR膜の電流誘起磁化反転2022

    • Author(s)
      潘達,曹哲,大島大輝,加藤剛志
    • Organizer
      電子情報通信学会磁気記録・情報ストレージ(MRIS)研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Electric-field modulation of perpendicular magnetic anisotropy and damping constant in MgO/Co/Pt trilayers2021

    • Author(s)
      A. Sakoguchi, T. Kato, D. Oshima, S. Iwata
    • Organizer
      INTERMAG 2021 Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Thermally assisted switching of MRAM cell using hybrid memory layer with different Curie temperatures2021

    • Author(s)
      T. Kato, W. Zhao, D. Oshima, S. Iwata
    • Organizer
      International Conference n Processing and Manufacturing and Advanced Materials 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of high TC interface layer in high TC/ low TC hybrid memory layer on thermally assisted spin-transfer-torque switching2021

    • Author(s)
      W. Zhao, T. Kato, D. Oshima, S. Iwata
    • Organizer
      The 15th Joint MMM-INTERMAG Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 高TC/低TCハイブリッド層を用いた熱アシストSTT磁化反転における界面高TC層の影響2021

    • Author(s)
      趙望臻,加藤剛志,大島大輝,岩田聡
    • Organizer
      第45回日本磁気学会学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 高TC/低TCハイブリッド層のスピン移行トルク磁化反転における界面高TC層の影響2021

    • Author(s)
      趙望臻,加藤剛志,大島大輝,岩田聡
    • Organizer
      電気学会マグネティックス研究会
    • Related Report
      2021 Annual Research Report
  • [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STT磁化反転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
  • [Patent(Industrial Property Rights)] 磁気メモリ装置,磁気メモリ素子の制御方法,および制御プログラム2023

    • Inventor(s)
      本多周太,加藤剛志,大島大輝,園部義明
    • Industrial Property Rights Holder
      本多周太,加藤剛志,大島大輝,園部義明
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2023-020242
    • Filing Date
      2023
    • Related Report
      2022 Annual Research Report
  • [Patent(Industrial Property Rights)] 磁気メモリ素子及び磁気メモリ装置2020

    • Inventor(s)
      園部義明,加藤剛志
    • Industrial Property Rights Holder
      園部義明,加藤剛志
    • Industrial Property Rights Type
      特許
    • Industrial Property Number
      2020-167193
    • Filing Date
      2020
    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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