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Current driven domain wall motions in rare earth transition metal alloys and it application toward tera bit information storage

Research Project

Project/Area Number 22360122
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electronic materials/Electric materials
Research InstitutionShinshu University

Principal Investigator

LIU Xiaoxi  信州大学, 工学部, 准教授 (10372509)

Co-Investigator(Kenkyū-buntansha) MORISAKO Akimitsu  信州大学, 工学部, 教授 (20115380)
安川 雪子  信州大学, 工学部, 特任助教 (10458995)
Project Period (FY) 2010 – 2012
Project Status Completed (Fiscal Year 2012)
Budget Amount *help
¥19,110,000 (Direct Cost: ¥14,700,000、Indirect Cost: ¥4,410,000)
Fiscal Year 2012: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2011: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2010: ¥11,180,000 (Direct Cost: ¥8,600,000、Indirect Cost: ¥2,580,000)
Keywordsスピントロニクス / 情報記録 / 磁性細線 / 磁気メモリー / 磁壁 / スピントルク / 電子材料 / スピンデバイス
Research Abstract

One of the fundamentals in spintronics is that the magnetic domain walls can be driven by spin polarized current. Such phenomena indicate that the magnetic reversal can be achieved by current directly rather than by magnetic field. However, the critical current to drive the domain walls is as large as 1012A/m2in normal magnetic materials. In this research, we found the critical current density can be decrease to 1/100 by using rear earth transition alloys with perpendicular magn etic anisotropy. We have investigated the films composition, magnetic anisotropy, and its effect on critical current density. We have also developed a new process to measure spin polarization in the wires. Our results show that rear earth transition alloys with perpendicular magnetic anisotropy are prominent candidate for next generation information storage devices with extremely high density.

Report

(4 results)
  • 2012 Annual Research Report   Final Research Report ( PDF )
  • 2011 Annual Research Report
  • 2010 Annual Research Report
  • Research Products

    (12 results)

All 2012 2011 2010

All Journal Article (7 results) (of which Peer Reviewed: 7 results) Presentation (5 results)

  • [Journal Article] Domain Wall Pinning Sites Introduced by Focused Ion Beam in TbFeCo Film2012

    • Author(s)
      Songtian Li, Taro Amagai, Xiaoxi Liu, Akimitsu Morisako
    • Journal Title

      IEEE TRANSACTIONS ON MAGNETICS

      Volume: 48(11) Issue: 11 Pages: 3658-3661

    • DOI

      10.1109/tmag.2012.2199741

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Current Driven Domain Wall Motion in Rare-Earth Transition Metal Alloys with Perpendicular Magnetic Anisotropy2012

    • Author(s)
      Songtian Li, Xiaoxi Liu, Akimitsu Morisako
    • Journal Title

      JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY

      Volume: 12(9) Issue: 9 Pages: 7550-7553

    • DOI

      10.1166/jnn.2012.6530

    • Related Report
      2012 Annual Research Report 2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Magnetotransport Properties in Antiferromagnetically Exchange-Coupled Ni/TbFeCo/Ni Trilayers2011

    • Author(s)
      Xiaoxi Liu, Kazunobu Hayashi, Kei Tajima, Akimitsu Morisako
    • Journal Title

      IEEE TRANSACTIONS ON MAGNETICS

      Volume: 47(10) Issue: 10 Pages: 3126-3128

    • DOI

      10.1109/tmag.2011.2147770

    • Related Report
      2012 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article]2011

    • Author(s)
      Songtian Li, Taro Amagai, Xiaoxi Liu, Akimitsu Morisako
    • Journal Title

      APPLIEDPHYSICS LETTERS

      Volume: 99(12) Issue: 12 Pages: 122501-122501

    • DOI

      10.1063/1.3641428

    • Related Report
      2012 Final Research Report 2011 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Current-Induced Domain Wall Motion in TbFeCo Wires With Perpendicular Magnetic Anisotropy2010

    • Author(s)
      Songtian Li, Hajime Nakamura, Hajime, Taichi Kanazawa, Xiaoxi Liu, Akimitsu Morisako
    • Journal Title

      IEEE TRANSACTIONS ON MAGNETICS

      Volume: 46(6) Issue: 6 Pages: 1695-1698

    • DOI

      10.1109/tmag.2010.2042576

    • Related Report
      2012 Final Research Report
    • Peer Reviewed
  • [Journal Article] Current-Induced Domain Wall Motion in TbFeCo Wires With Perpendicular Magnetic Anisotropy2010

    • Author(s)
      S.Li, H.Nakamura, T.Kanazawa, X.Liu, A.Morisako
    • Journal Title

      IEEE Transactions on Magnetics

      Volume: 46 Pages: 1695-1698

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Domain wall motion induced by low current density in TbFeCo wire with perpendicular magnetic anisotropy2010

    • Author(s)
      S.Li, H.Nakamura, T.Kanazawa, X.Liu, A.Morisako
    • Journal Title

      J.Mag.Soc.Jpn

      Volume: 34 Pages: 333-336

    • Related Report
      2010 Annual Research Report
    • Peer Reviewed
  • [Presentation] Current driven domain wall motion in rare-earth transition metal nanowires2012

    • Author(s)
      Akimitsu Morisako
    • Organizer
      Magnetic single nano-object workshop & school
    • Place of Presentation
      Ordizia, Spain
    • Year and Date
      2012-02-08
    • Related Report
      2011 Annual Research Report
  • [Presentation] High domain wall magnetoresistance in TbFeCo wires2011

    • Author(s)
      李松田,雨貝太郎,劉小晰,森迫昭光
    • Organizer
      平成 23 年度日本磁気学会学術講演概要集, 27pB-7
    • Place of Presentation
      新潟
    • Year and Date
      2011-09-27
    • Related Report
      2012 Final Research Report
  • [Presentation] Current driven domain wall motion in rare-earth transition metal alloys with perpendicular magnetic anisotropy2011

    • Author(s)
      Xiaoxi Liu
    • Organizer
      Recent trends in nanomagnetism, spintronics and their applications
    • Place of Presentation
      Ordizia, Spain
    • Year and Date
      2011-06-02
    • Related Report
      2011 Annual Research Report
  • [Presentation] Ni/TbFeCo/Ni 三層膜における磁気抵抗効果2010

    • Author(s)
      田島圭,林和延,劉小晰,森迫昭光
    • Organizer
      第34回日本磁気学会学術講演会,6pB-4
    • Place of Presentation
      つくば国際会議場
    • Year and Date
      2010-09-06
    • Related Report
      2012 Final Research Report
  • [Presentation] TbFeCo 細線上での磁壁電流駆動におけるピニングサイト抑制による臨界電流密度の低減2010

    • Author(s)
      中村肇,李松田,劉小晰,森迫昭光
    • Organizer
      第34回日本磁気学会学術講演会, 6aE-8
    • Place of Presentation
      つくば国際会議場
    • Year and Date
      2010-09-06
    • Related Report
      2012 Final Research Report

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Published: 2010-08-23   Modified: 2019-07-29  

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