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2008 Fiscal Year Final Research Report

Direct observation of ultra-fast switching behavior of a single nanomagnet and development of a new switching technology.

Research Project

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Project/Area Number 18686027
Research Category

Grant-in-Aid for Young Scientists (A)

Allocation TypeSingle-year Grants
Research Field Electronic materials/Electric materials
Research InstitutionTohoku University

Principal Investigator

OKAMOTO Satoshi  Tohoku University, 多元物質科学研究所, 准教授 (10292278)

Co-Investigator(Renkei-kenkyūsha) KITAKAMI Osamu  東北大学, 多元物質科学研究所, 教授 (70250834)
KIKUCHI Nobuaki  東北大学, 多元物質科学研究所, 助教 (80436170)
Project Period (FY) 2006 – 2008
Keywords磁気記録 / 高速スイッチング / パルス磁場 / 微細加工 / パターン媒体 / マイクロ波アシスト記録
Research Abstract

本研究では単一ナノ磁性粒子の超高速ならびに高感度な磁気計測技術の開発および, 超高速かつ低磁場反転技術の開発を行うことを目的として研究を行った. 大振幅高速パルス磁場印加システムならびに単一磁性粒子の残留磁化状態の超高感度逐次計測システムの構築を行い, それを用いて垂直磁気異方性を有するCo/Pt多層膜の単一ナノ磁性粒子を用いた磁化反転実験を進めた. その結果, 単一ナノ磁性体におけるスイッチング過程をナノ秒スケールで実験的に明らかにすることに成功した. またマイクロ波を用いた新規スイッチング技術についての検討を行い, その優位性を確認した.

  • Research Products

    (35 results)

All 2009 2008 2007 2006 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results) Presentation (19 results) Remarks (1 results) Patent(Industrial Property Rights) (4 results)

  • [Journal Article] Generation of nanosecond magnetic pulse field for switching experiments on a single Co/Pt nanodot2009

    • Author(s)
      N. Kikuchi, S. Okamoto, and O. Kitakami
    • Journal Title

      J. Appl. Phys 105

      Pages: 07D506-1-3

    • Peer Reviewed
  • [Journal Article] Magnetization switching experiments on sub-micron Co/Pt multilayer dot using a pulse field generator with nanoseconds duration2008

    • Author(s)
      A. Ito, N. Kikuchi, S. Okamoto, O. Kitakami
    • Journal Title

      IEEE Trans. Magne 44

      Pages: 3446-3449

    • Peer Reviewed
  • [Journal Article] Magnetization behavior of nanomagnets for patterned nedia application2008

    • Author(s)
      S. Okamoto, N. Kikuchi, T. Kato, O. Kitakami, K. Mitsuzuka, T. Shimatsu, H. Muraoka, H. Aoi, J. C. Lodder
    • Journal Title

      J. Magn. Magn. Mater 320

      Pages: 2874-2879

    • Peer Reviewed
  • [Journal Article] Thermal stability and switching field of hard/soft-stacked perpendicular media2008

    • Author(s)
      T. Shimatsu, N. Asakura, Y. Inaba, K. Kudo, A. Sato, H. Muraoka, H. Aoi, S. Okamoto, O. Kitakami
    • Journal Title

      J. Magn. Magn. Mater. 320

      Pages: 3088-3091

    • Peer Reviewed
  • [Journal Article] Frequency modulation effect on microwave assisted magnetization switching2008

    • Author(s)
      S. Okamoto, N. Kikuchi, and O. Kitakami
    • Journal Title

      Appl. Phys. Lett. 93

      Pages: 142501-1-3

    • Peer Reviewed
  • [Journal Article] Magnetization switching behavior with microwave assistance2008

    • Author(s)
      S. Okamoto, N. Kikuchi, and O. Kitakami
    • Journal Title

      Appl. Phys. Lett. 93

      Pages: 102506-1-3

    • Peer Reviewed
  • [Journal Article] The critical size between single domain and multidomain in L1_0-FePt particles2008

    • Author(s)
      N. Kikuchi, S. Okamoto, and O. Kitakami
    • Journal Title

      J. Appl. Phys 103

      Pages: 07D511-1-3

    • Peer Reviewed
  • [Journal Article] Magnetization reversal process and bistability of Co/Pt multilayer dot2008

    • Author(s)
      N. Kikuchi, T. Kato, S. Okamoto, O. Kitakami, N. Tezuka, and S. Sugimoto
    • Journal Title

      J. Appl. Phys. 103

      Pages: 07C510-1-3

    • Peer Reviewed
  • [Journal Article] Energy barrier and reversal mechanism in Co/Pt multilayer nanodot2008

    • Author(s)
      S. Okamoto, T. Kato, N. Kikuchi, O. Kitakami, N. Tezuka, and S. Sugimoto
    • Journal Title

      J. Appl. Phys 103

      Pages: 07C501-1-3

    • Peer Reviewed
  • [Journal Article] Epitaxially grown L10-FePt/(C, SiO2, and Al2O3) granular films2007

    • Author(s)
      S. Okamoto, O. Kitakami
    • Journal Title

      J. Magn. Magn. Mater. 310

      Pages: 2367-2368

    • Peer Reviewed
  • [Journal Article] Additive effect of ALN and MgO on FePt nanoparticle assembly2006

    • Author(s)
      S. Okamoto, O. Kitakami, and Y. Shimada
    • Journal Title

      Materials Trans 47

      Pages: 43-46

    • Peer Reviewed
  • [Presentation] Generation of nanoseconds magnetic pulse field for switching exon a single Co/Pt nanodot2008

    • Author(s)
      N. Kikuchi, S. Okamoto, O. Kitakami
    • Organizer
      53rd Annual Conference on Magnetism and Magnetic Materials (MMM2008)
    • Place of Presentation
      America, Austin
    • Year and Date
      2008-11-10
  • [Presentation] Frequency modulation effect on microwave assisted magnetization switching2008

    • Author(s)
      S. Okamoto, N. Kikuchi, O. Kitakami
    • Organizer
      53rd Annual Conference on Magnetism and Magnetic Materials (MMM2008)
    • Place of Presentation
      America, Austin
    • Year and Date
      2008-11-10
  • [Presentation] Fabrication of L11 type (Co-Ni)-Pt ordered alloy films by sputter deposition for bit-patterned media2008

    • Author(s)
      H. Sato,T. Shimatsu, H. Kataoka, H. Aoi, O. Kitakami, S. Okamoto,
    • Organizer
      53rd Annual Conference on Magnetism and Magnetic Materials(MMM2008)
    • Place of Presentation
      America, Austin
    • Year and Date
      2008-11-10
  • [Presentation] Magnetic behavior of single nanostructured magnet2008

    • Author(s)
      O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, K. Mitsuzuka, H. Aoi
    • Organizer
      International Conference on AdvancedStructural and Functional Materials Design 2008
    • Place of Presentation
      Osaka
    • Year and Date
      2008-11-10
  • [Presentation] Study on nanostructured magnets for bit patterned media2008

    • Author(s)
      O. Kitakami, S. Okamoto, N. Kikuchi, T. Shimatsu, H. Aoi
    • Organizer
      International Disk Forum 2008
    • Place of Presentation
      Japan,Tokyo
    • Year and Date
      2008-07-22
  • [Presentation] Microwave assisted magnetization reversal and its thermal activation2008

    • Author(s)
      S. Okamoto, N. Kikuchi, O. Kitakami
    • Organizer
      International Magnetics Conference
    • Place of Presentation
      Spain, Madrid
    • Year and Date
      2008-05-04
  • [Presentation] Magnetization switching experiments on submicron Co/Pt multilayer dot with pulse field generator with nanosecond duration2008

    • Author(s)
      N. Kikuchi, A. Ito, S. Okamoto, O. Kitakami
    • Organizer
      International Magnetics Conference
    • Place of Presentation
      Spain, Madrid
    • Year and Date
      2008-05-04
  • [Presentation] The boundary between single-and multi-domain for L10-FePt nanoparticles2007

    • Author(s)
      N. Kikuchi, S. Okamoto, O. Kitakam
    • Organizer
      52nd MMM Conference
    • Place of Presentation
      USA, Tampa
    • Year and Date
      2007-11-07
  • [Presentation] Magnetization reversal process and single domain stability of Co/Pt multilayer dot2007

    • Author(s)
      N. Kikuchi, T. Kato, S. Okamoto, O. Kitakami, N. Tezuka, S. Sugimoto
    • Organizer
      52nd MMM Conference
    • Place of Presentation
      USA, Tampa
    • Year and Date
      2007-11-07
  • [Presentation] Magnetic properties of Hard/Soft stacked perpendicular media with various soft layer thickness2007

    • Author(s)
      T. Shimatsu, A. Sato, N. Asakura, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi
    • Organizer
      52nd MMM Conference
    • Place of Presentation
      USA, Tampa
    • Year and Date
      2007-11-07
  • [Presentation] Fabrication of L11 type Co-Pt ordered alloy films by sputter deposition2007

    • Author(s)
      H. Sato, T. Shimatsu, Y. Okazaki, O. Kitakami, S. Okamoto, H. Muraoka, H. Aoi
    • Organizer
      52nd MMM Conference
    • Place of Presentation
      USA, Tampa
    • Year and Date
      2007-11-07
  • [Presentation] Energy barrier and reversal mechanism in Co/Pt multilayer nanodot2007

    • Author(s)
      S. Okamoto, T. Kato, N. Kikuchi, O. Kitakami, N. Tezuka, S. Sugimoto
    • Organizer
      52nd MMM Conference
    • Place of Presentation
      USA, Tampa
    • Year and Date
      2007-11-07
  • [Presentation] Magnetization reversal of Co/Pt nanodot by applying pulse field2007

    • Author(s)
      S. Okamoto, A. Ito, N. Kikuchi, O. Kitakami
    • Organizer
      8th Perpendicular Magnetic Recording Conference
    • Place of Presentation
      Japan, Tokyo
    • Year and Date
      2007-10-15
  • [Presentation] Magnetization behavior and reversal process of Co/Pt multilayer nanodot2007

    • Author(s)
      N. Kikuchi, S. Okamoto, T. Kato, O. Kitakami
    • Organizer
      8th Perpendicular Magnetic Recording Conference
    • Place of Presentation
      Japan, Tokyo
    • Year and Date
      2007-10-15
  • [Presentation] Magnetization behavior of nanomagnets for patterned media application2007

    • Author(s)
      S. Okamoto, N. Kikuchi, O. Kitakami, and T. Shimatsu
    • Organizer
      8th Perpendicular Magnetic Recording Conference
    • Place of Presentation
      Japan, Tokyo
    • Year and Date
      2007-10-15
  • [Presentation] Epitaxially grown L10-FePt/ (C, SiO2, and Al2O3) granular films2006

    • Author(s)
      S. Okamoto, and O. Kitakami
    • Organizer
      ICM 2006
    • Place of Presentation
      Japan, Kyoto
    • Year and Date
      2006-08-20
  • [Presentation] Magnetic properties of assembled nanoparticle films of L1_0-FePt2006

    • Author(s)
      N. Kikuchi, S. Okamoto, O. Kitakami
    • Organizer
      ICM 2006
    • Place of Presentation
      Japan,Kyoto
    • Year and Date
      2006-08-20
  • [Presentation] Interfacially Disordered FePt hard/soft Stacked Structures2006

    • Author(s)
      Y. K. Takahashi, K. Hono, S. Okamoto, O. Kitakami
    • Organizer
      The Intermag 2006 Conference
    • Place of Presentation
      USA, San Diego
    • Year and Date
      2006-05-08
  • [Presentation] Large uniaxial Magnetic Anisotropy in Co100-XPtX/Ru Disordered Perpendi- cular Films2006

    • Author(s)
      T. Shimatsu, Y. Okazaki, H. Sato, O. Kitakami, S. Okamoto, H. Aoi, H. Muraoka, Y. Nakamura
    • Organizer
      The Intermag 2006 Conference
    • Place of Presentation
      USA, San Diego
    • Year and Date
      2006-05-08
  • [Remarks] ホームページ等

    • URL

      http://nanomagnet.tagen.tohoku.ac.jp/

  • [Patent(Industrial Property Rights)] 磁性薄膜とその作製方法および同薄膜を用いたデバイス2008

    • Inventor(s)
      島津武仁, 佐藤英夫, 北上修, 岡本聡, 青井基, 片岡弘康
    • Industrial Property Rights Holder
      東北大学, 富士電機
    • Industrial Property Number
      特許,特願2008-310965
    • Filing Date
      2008-12-05
  • [Patent(Industrial Property Rights)] 磁性薄膜とその作製方法および同薄膜を用いたデバイス2008

    • Inventor(s)
      島津 武仁, 佐藤英夫, 北上修, 岡本聡, 青井基, 片岡弘康
    • Industrial Property Rights Holder
      東北大学, 富士電機
    • Industrial Property Number
      特許,特願2008-193156
    • Filing Date
      2008-07-28
  • [Patent(Industrial Property Rights)] 磁気記録方法2008

    • Inventor(s)
      岡本聡, 北上修, 菊池伸明, 島津武仁, 青井基
    • Industrial Property Rights Holder
      東北大学
    • Industrial Property Number
      特許,特願2008-159822
    • Filing Date
      2008-06-19
  • [Patent(Industrial Property Rights)] 磁気記録方法2007

    • Inventor(s)
      岡本聡, 北上修, 菊池伸明, 島津武仁
    • Industrial Property Rights Holder
      東北大学
    • Industrial Property Number
      特許,特願2007-247358
    • Filing Date
      2007-09-25

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Published: 2010-06-10   Modified: 2016-04-21  

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