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Challenge to propose and demonstrate racetrack memory for direct optical magnetic recording with high-speed optical communication light

Research Project

Project/Area Number 21K18735
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 21:Electrical and electronic engineering and related fields
Research InstitutionToyota Technological Institute

Principal Investigator

AWANO HIROYUKI  豊田工業大学, 工学(系)研究科(研究院), 教授 (40571675)

Project Period (FY) 2021-07-09 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
Fiscal Year 2022: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2021: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Keywords磁性細線メモリ / 超高速光磁気記録 / 高速データレート / 高速磁壁移動速度 / 高感度光磁気記録 / 短パルス電流高速磁壁駆動 / DMI高感度光磁気記録 / 超低消費電力 / 電流磁壁駆動 / 希土類/遷移金属合金・多層膜 / レーザーアニール / ナノインプリントスピンデバイス / ジャロシンスキー守谷相互作用 / 高感度化 / 赤外記録 / 光通信レーストラックメモリ / 高速磁壁駆動 / 磁壁移動速度 / 高速光磁気記録
Outline of Research at the Start

第4次産業革命は5G,6G通信革命がキー技術であり、この高速データ通信を支えているのが光通信である。光通信速度は100Gbpsと速いが、これを保存するSRAMのデータレートは1Gbpsと遅く、大量のSRAMに光通信信号を並列記録している。このため、光電変換とSRAMの電力が大問題となっている。そこで、光電変換とSRAMが不要な新しい光レーストラックメモリを提案する。希土類・遷移金属は有名な光磁気記録材料であるが、この材料を磁性細線メモリに適応すると低電流密度で高速に磁区を動かすことができる。磁性細線に光通信光で光磁気記録し、記録磁区を次々に電流で磁性細線上を移動することで不揮発メモリとなる。

Outline of Final Research Achievements

In a magnetic nanowire memory in which the domain wall on a GdFeCo magnetic nanowire is driven by a pulsed current, we found that the domain wall movement speed can be increased to 2000 m/sec without the help of an external magnetic field by shortening the pulse width. We proposed ultra-high-speed magneto-optical recording using optical pulses for data input. Since the magnetic domain movement speed in conventional magneto-optical recording is about 50 m/sec, this new proposal can increase the data transfer rate by a factor of 40. However, since the short-pulse light power for optical communication is 1/40 of that for conventional magneto-optical recording, the heat storage structure is important, and we investigated it. The heavy metal layer Pt heterostructure is important for high-speed domain wall drive, and we found that it is also useful for high-sensitivity magneto-optical recording.

Academic Significance and Societal Importance of the Research Achievements

Society5.0では、データセンターへのビッグデータ蓄積に必要な消費電力の急増が大問題になっている。この原因は高速な光通信信号を光電変換して半導体メモリに記録するシステムにある。そこで、本提案のように光通信光を直接電流駆動型磁性細線メモリに照射して光磁気記録できればデータセンターの消費電力を100分の1に低減することが可能となる。磁壁の移動速度が2000m/secで、最短記録ビット長を100nmとした場合、データ転送レートは20Gbpsとなり、提案の実現性にマッチする。この手法により光電変換と半導体メモリへの記録電力が不要となり、革新的にデータセンターの消費電力を低減することが期待できる。

Report

(3 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • Research Products

    (15 results)

All 2022 2021

All Journal Article (5 results) (of which Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (10 results) (of which Int'l Joint Research: 7 results)

  • [Journal Article] Enhancement of permittivity off-diagonal terms in rare earth transition metal / heavy metal hetero-structured films2022

    • Author(s)
      Matsumoto Kei、Thach Pham Van、Sumi Satoshi、Ranjbar Sina、Tanabe Kenji、Awano Hiroyuki、Wang Shihao、Ishibashi Takayuki、Saito Shin
    • Journal Title

      Frontiers in Physics

      Volume: 10 Pages: 949571-949571

    • DOI

      10.3389/fphy.2022.949571

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Evaluation of multi-bit domain wall motion by low current density to obtain ultrafast data rate in a compensated ferrimagnetic wire2022

    • Author(s)
      S. Ranjbar, S. Sumi, K. Tanabe, and H. Awano
    • Journal Title

      APL Materials

      Volume: 10 Issue: 9 Pages: 091102-091102

    • DOI

      10.1063/5.0086380

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Elucidation of the mechanism for maintaining ultrafast domain wall mobility over a wide temperature range2022

    • Author(s)
      Ranjbar S.、Kambe S.、Sumi S.、Thach P. V.、Nakatani Y.、Tanabe K.、Awano H.
    • Journal Title

      Materials Advances

      Volume: 3 Issue: 18 Pages: 7028-7036

    • DOI

      10.1039/d2ma00273f

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ultra-thin interfacial domain wall less than 1 nm based on TbxCo100-x/Cu/[Co/Pt]2 heterostructures for multi-level magnetic pillar memory2021

    • Author(s)
      S. Ranjbar, S. Sumi, K. Tanabe, and H. Awano
    • Journal Title

      AIP Advances

      Volume: 11 Issue: 19 Pages: 115017-115017

    • DOI

      10.1063/5.0072336

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Large Perpendicular Exchange Energy in TbxCo100-x/Cu (t)/[Co/Pt]2 heterostructures2021

    • Author(s)
      S. Ranjbar, S. Sumi, K. Tanabe, and H. Awano
    • Journal Title

      Magnetochemistry

      Volume: 7 Issue: 11 Pages: 110141-110141

    • DOI

      10.3390/magnetochemistry7110141

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Current density reduction of current driven domain wall motion with laser irradiation to the TbCo wires2022

    • Author(s)
      Y. Miyose, S. Sumi, K, Tanabe, H. Awano
    • Organizer
      ICMFS (International Colloquium on Magnetic Films and Surfaces)’2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetic field dependence of mV class very large spin motive force due to domain wall motion in GdFeCo magnetic wire2022

    • Author(s)
      M. Oikawa, S. Sumi, K, Tanabe, H. Awano
    • Organizer
      ICMFS (International Colloquium on Magnetic Films and Surfaces)’2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anormalous Nernst Effect of TbCo deposited on a land-grrove structure fabricated by nanoimprint lithography2022

    • Author(s)
      M. Sakamoto, S. Sumi, K, Tanabe, H. Awano
    • Organizer
      ICMFS (International Colloquium on Magnetic Films and Surfaces)’2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Improvement of domain wall velocityand reduction of current density by laser annealing to the TbCo wires2022

    • Author(s)
      20)Yamato Miyose, Sina Ranjbar, Satoshi Sumi, Kenji Tanabe, Hiroyuki Awano
    • Organizer
      MMM2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetic field dependence of mV class spin motive force due to domain wall motion in GdFeCo magnetic wire2022

    • Author(s)
      21)Mirai Oikawa, Hiroyuki Awano, Sota Kambe, Satoshi Sumi, and Kenji Tanabe,
    • Organizer
      MMM2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] TbCo, GdFeCo/Pt積層膜の補償温度近傍磁気光学特性2022

    • Author(s)
      鷲見聡、Sina Ranjbar、田辺賢士、粟野博之
    • Organizer
      応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] TbCo薄膜/プラスチック基板へのレーザー照射による基板形状変化と磁気特性の関係2022

    • Author(s)
      鈴木紀行、明瀬大和、神戸崇太、鷲見聡、田辺賢士、粟野博之
    • Organizer
      応用物理学会秋季学術講演会
    • Related Report
      2022 Annual Research Report
  • [Presentation] TbCo/重金属ヘテロ界面のホール効果2022

    • Author(s)
      鷲見聡、Armet Yagmur, 田辺賢士、粟野博之
    • Organizer
      第60回応用物理学会春季学術講演会
    • Related Report
      2021 Research-status Report
  • [Presentation] Spin motive force due to domain wall motion in GdFeCo magnetic wires2022

    • Author(s)
      M. Oikawa, S. Sumi, K. Tanabe, H. Awano,
    • Organizer
      2022 Joint MMM-INTERMAG
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Influence of pulse width and Joule heating on current-induced domain wall motion2022

    • Author(s)
      S. Kambe, S. Ranjbar, S. Sumi, K. Tanabe, H. Awano
    • Organizer
      2022 Joint MMM-INTERMAG
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research

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Published: 2021-07-13   Modified: 2024-01-30  

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