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Nanostructure engineering for realization of highly efficient spin-orbit torque device controled by gate voltage

Research Project

Project/Area Number 19H00844
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Review Section Medium-sized Section 28:Nano/micro science and related fields
Research InstitutionTohoku University

Principal Investigator

Saito Yoshiaki  東北大学, 国際集積エレクトロニクス研究開発センター, 教授 (80393859)

Co-Investigator(Kenkyū-buntansha) 手束 展規  東北大学, 工学研究科, 准教授 (40323076)
池田 正二  東北大学, 国際集積エレクトロニクス研究開発センター, 教授 (90281865)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥44,980,000 (Direct Cost: ¥34,600,000、Indirect Cost: ¥10,380,000)
Fiscal Year 2022: ¥7,930,000 (Direct Cost: ¥6,100,000、Indirect Cost: ¥1,830,000)
Fiscal Year 2021: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Fiscal Year 2020: ¥11,830,000 (Direct Cost: ¥9,100,000、Indirect Cost: ¥2,730,000)
Fiscal Year 2019: ¥13,650,000 (Direct Cost: ¥10,500,000、Indirect Cost: ¥3,150,000)
Keywordsスピントロニクス / スピン軌道トルク / ナノ構造エンジニアリング / 電圧制御 / 低抵抗高効率重金属配線 / ジャロシンスキー守谷相互作用
Outline of Research at the Start

超低消費電力・高速スピンメモリデバイスである高効率スピン軌道トルク(SOT)電圧制御デバイスの創製に挑戦する。低消費電力化のためには、SOTを増大することが重要であり、SOTの大きさと、重金属ナノ構造、界面制御層、比抵抗、スピン拡散長との相関を調べてスピン伝導メカニズムの解明を行い、低抵抗で高効率な重金属ナノ構造配線/界面制御層構造を見出す。さらに、その上に高熱安定性記録層を有しアスペクト比1の垂直磁化方式のSOTデバイスを作製する技術や、無磁場でのスピン反転技術、スピンの電圧制御技術を開発することにより、理想的なSOT電圧制御デバイス技術を構築し、大規模IoT、知的システムの発展に貢献する。

Outline of Final Research Achievements

We have established low-power and high-density technologies for the two systems, W/CoFeB and Pt/Co systems, which are candidates for high-speed spin-orbit torque (SOT)-MRAM device by investigating the correlation between nanostructure of heavy metals and magnitude of SOT. We have been proposed a W/Hf-multilayer structure and synthetic antiferromagnetic (AF) heavy-metal (HM) structure with Pt/Ir/Pt spacer layer, and succeed in establishing an efficient SOT magnetization switching technology for low resistive HM wiring, which was considered difficult to achieve at the time of the start of this “kiban-A” project. The most energy efficient SOT reversal has been observed in the synthetic AF systems. We have also succeeded in observing field-free switching at room temperature by using the effective field of Dzyaloshinskii-Moriya interaction at the interface of the magnetic layer of perpendicularly magnetized synthetic AF systems.

Academic Significance and Societal Importance of the Research Achievements

本研究により、これまで困難とされてきた「低抵抗で高効率な重金属配線技術」、「垂直磁化を有する強磁性層の無磁場でのスピン反転技術」の確立に成功した。まだ書込み電流は、現行のスピントルク(STT)-MRAMよりも大きいが、今回開発したSyhthetic AF重金属配線材料は低抵抗であるため、本SOTの消費電力はSTTの1/2以下に低減できたことになる。また、大容量化に有効な垂直磁化を有する強磁性層の無磁場での磁化反転にも成功し、SOT-MRAMの社会での関心が高まっている。直磁気異方性の増大、反強磁性結合の消失、無磁場での磁化反転のメカニズムの理解など、ここで得られた学術的な意義も大きい。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Comments on the Screening Results   Annual Research Report
  • Research Products

    (23 results)

All 2023 2022 2021 2020 2019

All Journal Article (9 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 9 results,  Open Access: 2 results) Presentation (14 results) (of which Int'l Joint Research: 8 results)

  • [Journal Article] Correlation between the magnitude of interlayer exchange coupling and charge-to-spin conversion efficiency in a synthetic antiferromagnetic system2023

    • Author(s)
      Saito Yoshiaki、Ikeda Shoji、Endoh Tetsuo
    • Journal Title

      Applied Physics Express

      Volume: 16 Issue: 1 Pages: 013002-013002

    • DOI

      10.35848/1882-0786/acb311

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Effect of oxygen incorporation on dynamic magnetic properties in Ta-O/Co-Fe-B bilayer films under out-of-plane and in-plane magnetic fields2022

    • Author(s)
      Nguyen T. V. A.、Saito Y.、Naganuma H.、Ikeda S.、Endoh T.、Endo Y.
    • Journal Title

      AIP Advances

      Volume: 12 Issue: 3 Pages: 035133-035133

    • DOI

      10.1063/9.0000297

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Enhancement of current to spin-current conversion and spin torque efficiencies in a synthetic antiferromagnetic layer based on a Pt/Ir/Pt spacer layer2022

    • Author(s)
      Saito Yoshiaki、Ikeda Shoji、Endoh Tetsuo
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 5

    • DOI

      10.1103/physrevb.105.054421

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Antiferromagnetic interlayer exchange coupling and large spin Hall effect in multilayer systems with Pt/Ir/Pt and Pt/Ir layers2021

    • Author(s)
      Saito Yoshiaki、Tezuka Nobuki、Ikeda Shoji、Endoh Tetsuo
    • Journal Title

      Physical Review B

      Volume: 104 Issue: 6

    • DOI

      10.1103/physrevb.104.064439

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Synthetic antiferromagnetic layer based on Pt/Ru/Pt spacer layer with 1.05?nm interlayer exchange oscillation period for spin?orbit torque devices2021

    • Author(s)
      Saito Yoshiaki、Ikeda Shoji、Endoh Tetsuo
    • Journal Title

      Applied Physics Letters

      Volume: 119 Issue: 14 Pages: 142401-142401

    • DOI

      10.1063/5.0063317

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] W thickness dependence of spin Hall effect for (W/Hf)-multilayer electrode/CoFeB/MgO systems with flat and highly (100) oriented MgO layer2021

    • Author(s)
      Y. Saito, N. Tezuka, S. Ikeda, and T. Endoh
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 2

    • DOI

      10.1063/9.0000011

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Large spin Hall effect and increase in perpendicular magnetic anisotropy in artificially synthesized amorphous W/Hf multilayer/CoFeB system2020

    • Author(s)
      Saito Yoshiaki、Tezuka Nobuki、Ikeda Shoji、Endoh Tetsuo
    • Journal Title

      Applied Physics Letters

      Volume: 116 Issue: 13 Pages: 132401-132401

    • DOI

      10.1063/5.0002642

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Increase in spin-Hall effect and influence of anomalous Nernst effect on spin-Hall magnetoresistance in β-phase and α-phase W100-xTax/CoFeB systems2019

    • Author(s)
      Saito Yoshiaki、Tezuka Nobuki、Ikeda Shoji、Sato Hideo、Endoh Tetsuo
    • Journal Title

      Applied Physics Express

      Volume: 12 Issue: 5 Pages: 053008-053008

    • DOI

      10.7567/1882-0786/ab1a66

    • NAID

      210000155783

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spin Hall effect investigated by spin Hall magnetoresistance in Pt100-xAux/CoFeB systems2019

    • Author(s)
      Saito Yoshiaki、Tezuka Nobuki、Ikeda Shoji、Sato Hideo、Endoh Tetsuo
    • Journal Title

      AIP Advances

      Volume: 9 Issue: 12 Pages: 125312-125312

    • DOI

      10.1063/1.5129889

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Enhancement of current to spin current conversion efficiency in synthetic antiferromagnetic layer system2022

    • Author(s)
      Y. Saito, S. Ikeda, and T. Endoh
    • Organizer
      2022 MMM Conference
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Synthetic AF構造を用いたSpin-orbit torque効率の増大2022

    • Author(s)
      斉藤好昭、池田正二、遠藤哲郎
    • Organizer
      第46回日本磁気学会学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] Effect of surface treatment on damping constant in Ta-O/Co-Fe-B heterostructures2022

    • Author(s)
      T. V. A. Nguyen, Y. Saito, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      2022 Joint MMM-Intermag Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Co/Pt/NS/Pt/Co (NS= Ru, Ir) synthetic antiferromagnetic layers for spin-orbit torque switching originating from the spin-Hall effect2022

    • Author(s)
      Y. Saito, S. Ikeda, and T. Endoh
    • Organizer
      2022 Joint MMM-Intermag Conference
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Dependence of dynamic magnetic properties on the Co-Fe-B layer thickness for Ta/Co-Fe-B and Ta-O/Co-Fe-B bilayers2022

    • Author(s)
      T. V. A. Nguyen, Y. Saito, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      2022年第69回応用物理学会春季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Spin-orbit torque in naturally oxidized Ta-O/Co-Fe-B/Mg-O/Ta structures2021

    • Author(s)
      T. V. A. Nguyen, S. DuttaGuppa, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      IEEE International magnetic conference 2021 (Intermag 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Evaluation of resistivity in Ta-O/Co-Fe-B multilayers with the presence of interfacial scattering2021

    • Author(s)
      T. V. A. Nguyen, DuttaGuppa, Y. Saito, K. V. De Zoysa, S. Fukami, H. Naganuma, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      第 82回 応用物理学会秋季学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 垂直磁化強磁性 / 非磁性 / 強磁性多層膜の磁化過程とスピン軌道トルク磁化反転2021

    • Author(s)
      赤谷一, 松浦昌志, 手束展規, 杉本諭
    • Organizer
      日本金属学会 2021年秋期講演(第 169 回)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Investigation of spin-orbit torque induced magnetization switching in Ta-O/Co-Fe-B heterostructures2021

    • Author(s)
      T. V. A. Nguyen, DuttaGuppa, Y. Saito, K. V. De Zoysa, S. Fukami, S. Ikeda, T. Endoh, Y. Endo
    • Organizer
      第 68回 応用物理学会春季学術講演会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Flat and highly (100) texture of MgO tunnel barrier and W/Hf thickness ratio dependence in MgO/CoFeB/(W/Hf)-multilayer large spin Hall effect electrode system2020

    • Author(s)
      Y. Saito, N. Tezuka, S. Ikeda and T. Endoh
    • Organizer
      65th annual Magnetism & Magnetic Materials Conference (MMM2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Large spin Hall effect and enhancement of perpendicular magnetic anisotropy in artificially synthesized W/Hf multilayers/CoFeB system2020

    • Author(s)
      Y. Saito, N. Tezuka, S. Ikeda and T. Endoh
    • Organizer
      IEEE International magnetic conference 2020 (Intermag 2020)
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin Hall effect in β-phase and α-phase W100-xTax/CoFeB systems2019

    • Author(s)
      Y. Saito, N. Tezuka, S. Ikeda, H. Sato and T. Endoh
    • Organizer
      10th International symposium on Metalic Multilayers (MML2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Spin Hall effect investigated by spin Hall magnetoresistance in Pt100-xAux/CoFeB/MgO systems2019

    • Author(s)
      Y. Saito, N. Tezuka, S. Ikeda, H. Sato and T. Endoh
    • Organizer
      64th annual Magnetism & Magnetic Materials Conference (MMM2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] β相およびα相W-Ta合金/CoFeB積層系のスピンホール磁気抵抗効果2019

    • Author(s)
      斉藤好昭、手束展規、池田正二、佐藤英夫、遠藤哲郎
    • Organizer
      日本磁気学会
    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2024-01-30  

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