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Development of the energy assisted magnetic recording media for high areal density and control of the magnetization switching

Research Project

Project/Area Number 26289232
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypePartial Multi-year Fund
Section一般
Research Field Physical properties of metals/Metal-base materials
Research InstitutionNational Institute for Materials Science

Principal Investigator

Takahashi Yukiko  国立研究開発法人物質・材料研究機構, 磁性スピントロニクス材料研究拠点, 主席研究員 (50421392)

Co-Investigator(Kenkyū-buntansha) 宝野 和博  国立研究開発法人物質・材料研究機構, 磁性・スピントロニクス材料研究拠点, 拠点長 (60229151)
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
Budget Amount *help
¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
Fiscal Year 2016: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥5,720,000 (Direct Cost: ¥4,400,000、Indirect Cost: ¥1,320,000)
KeywordsFePt媒体 / エネルギーアシスト磁化反転 / FePt / 微細構造制御
Outline of Final Research Achievements

The purpose of this work was the development of the FePt media with areal density larger than 4 Tbit/in2 and the control of the magnetization switching by the energy assistance. We controlled the microstructure of FePt-C granular media based on the microstructure observation. By the compositionally graded deposition method, in which C composition was gradually changed in order to avoid the second layer formation, we obtained the FePt-C granular media with small average grain size of 6.2 nm, high aspect ratio of 1.9 and high switching field of about 4 T. By the exposure of the circularly polarized light to the FePt-C granular media with the high switching field, the switching field was substantially decreased by 0.2 T. By the analysis of the magnetization change, the switching was found to be accumulative due to the dichroism.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Annual Research Report
  • 2014 Annual Research Report

Research Products

(31 results)

All 2016 2015 2014 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 3 results,  Acknowledgement Compliant: 5 results,  Peer Reviewed: 4 results) Presentation (21 results) (of which Int'l Joint Research: 6 results,  Invited: 4 results) Book (1 results)

  • [Int'l Joint Research] University of California, San Diego/HGST. San Jose Research Center(米国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] CMRR, Univ. California, San Diego/HGST. San Jose Research Center(米国)

    • Related Report
      2015 Annual Research Report
  • [Journal Article] FePt系グラニュラー媒体に関する最近の進展2016

    • Author(s)
      高橋有紀子、宝野和博
    • Journal Title

      まぐね

      Volume: 11 Pages: 317-324

    • Related Report
      2016 Annual Research Report
    • Acknowledgement Compliant
  • [Journal Article] Accumulative Magnetic Switching of Ultrahigh-Density Recording Media by Circularly Polarized Light2016

    • Author(s)
      Y.K. Takahashi, R. Medapalli, S. Kasai, J. Wang, K. Ishioka, S.H. Wee, O. Hellwig, K. Hono, and E.E. Fullerton
    • Journal Title

      Phys. Rev. Applied

      Volume: 6 Pages: 054004-054004

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Influence of MgO underlayers on the structure and magnetic properties of FePt-C nanogranular films for heat-assisted magnetic recording media2016

    • Author(s)
      T. Shiroyama, B. S. D. Ch. S. Varaprasad, Y. K. Takahashi and K. Hono
    • Journal Title

      AIP Advances

      Volume: 6 Pages: 105105-105105

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Magnetization reversal of FePt based exchange coupled composite media2016

    • Author(s)
      J. Wang, H. Sepehri-Amin, Y.K. Takahashi, S. Okamoto, S. Kasai, J.Y. Kim, T. Schrefl, K. Hono,
    • Journal Title

      Acta Mater.

      Volume: 111 Pages: 47-55

    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Journal Article] Structure Optimization of FePtC Nanogranular Films for Heat-Assisted Magnetic Recording Media2016

    • Author(s)
      H. Pandey, J. Wang, T. Shiroyama, B. S. D. Ch. S. Varaprasad, H. Sepehri-Amin, Y. K. Takahashi, A. Perumal, K. Hono
    • Journal Title

      IEEE Trans. Magn

      Volume: 52 Pages: 3200108-3200108

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Columnar Structure in FePt-C Granular Media for Heat-Assisted Magnetic Recording2015

    • Author(s)
      B. S. D. Ch. S. Varaprasad, J. Wang, T. Shiroyama, Y. K. Takahashi, and K. Hono
    • Journal Title

      IEEE Trans. Magn.

      Volume: 51 Pages: 3200904-3200904

    • DOI

      10.1109/tmag.2015.2435027

    • Related Report
      2015 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Effect of MgO underlayer misorientation on the texture and magnetic property of FePt–C granular film2015

    • Author(s)
      J. Wang, S. Hata, Y.K. Takahashi, H. Sepehri-Amin, B.S.D.Ch.S. Varaprasad, T. Shiroyama, T. Schrefl, K. Hono,
    • Journal Title

      Acta Mater

      Volume: 91 Pages: 41-49

    • DOI

      10.1016/j.actamat.2015.03.007

    • Related Report
      2015 Annual Research Report 2014 Annual Research Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Presentation] Accumulative magnetic switching of FePt granular media by circularly polarized light2016

    • Author(s)
      Y.K. Takahashi, R. Madapalli, S. Kasai, J. Wang, K. Ishioka, S.H. Wee, O. Hellwig, K. Hono and E.E. Fullerton
    • Organizer
      The 61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      NewOrleans USA
    • Year and Date
      2016-10-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Effect of substrate surface roughness on the texture and magnetic property of FePt-C granular film2016

    • Author(s)
      J. Wang, Y. K. Takahashi, H. Sepehri-Amin and K. Hono
    • Organizer
      The 61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      NewOrleans USA
    • Year and Date
      2016-10-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of CrB insertion on the (001) texture of MgO seed layer and magnetic properties of FePt-C HAMR media2016

    • Author(s)
      J. Wang, H. Sepehri-Amin, Y.K. Takahashi, K. Yakushiji, H. Kubota and K. Hono
    • Organizer
      The 61st Annual Conference on Magnetism and Magnetic Materials
    • Place of Presentation
      NewOrleans USA
    • Year and Date
      2016-10-31
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Effect of CrB insertion on the (001) texture of MgO seed layer and magnetic properties of FePt-C HAMR media2016

    • Author(s)
      J. Wang, H. Sepehri-Amin, Y.K. Takahashi and K. Hono
    • Organizer
      日本磁気学会学術講演会
    • Place of Presentation
      石川県金沢市 金沢大学
    • Year and Date
      2016-09-21
    • Related Report
      2016 Annual Research Report
  • [Presentation] Accumulative magnetic switching of FePt granular media by circularly polarized light2016

    • Author(s)
      Y.K. Takahashi, R. Madapalli, S. Kasai, J. Wang, K. Ishioka, S.H. Wee, O. Hellwig, K. Hono and E.E. Fullerton
    • Organizer
      日本磁気学会学術講演会
    • Place of Presentation
      石川県金沢市 金沢大学
    • Year and Date
      2016-09-05
    • Related Report
      2016 Annual Research Report
  • [Presentation] Effect of CrB insertion on the (001) texture of MgO seed layer and magnetic properties of FePt-C HAMR media2016

    • Author(s)
      J. Wang, H. Sepehri-Amin, Y.K. Takahashi, K. Yakushiji, H. Kubota and K. Hono
    • Organizer
      JIM 2016 Fall Annual Meeting
    • Place of Presentation
      大阪府吹田市 大阪大学豊中キャンパス
    • Year and Date
      2016-09-05
    • Related Report
      2016 Annual Research Report
  • [Presentation] Growth mechanism of columnar grains in FePt-C granular films for HAMR media processed by compositionally graded sputtering2016

    • Author(s)
      H. Pandey, A. Perumal, J. Wang, H. Sepheri-Amin, Y. K. Takahashi, and K. Hono
    • Organizer
      13th Joint MMM-Intermag Conference
    • Place of Presentation
      San Diego, USA
    • Year and Date
      2016-01-12
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] FePt系グラニュラー媒体の最近の進展2016

    • Author(s)
      高橋 有紀子
    • Organizer
      IDEMAヘッド・ディスク部会
    • Place of Presentation
      東京港区 虎の門 IDEMA事務所会議室
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] Development of FePt Based HAMR Media2016

    • Author(s)
      J. Wang, H. Sepehri-Amin, Y.K. Takahashi, and K. Hono
    • Organizer
      SRC winter review
    • Place of Presentation
      東京千代田区 飯田橋レインボービル
    • Related Report
      2016 Annual Research Report
    • Invited
  • [Presentation] 磁気記録におけるスピントロニクス2015

    • Author(s)
      高橋有紀子
    • Organizer
      応用物理学会九州支部 セミナー
    • Place of Presentation
      琉球大学
    • Year and Date
      2015-12-05
    • Related Report
      2015 Annual Research Report
    • Invited
  • [Presentation] Switching field distribution of FePt-C/FePt exchange coupled perpendicular media2015

    • Author(s)
      J. Wang, Y.K. Takahashi, J.Y. Kim, K. Hono
    • Organizer
      日本磁気学会
    • Place of Presentation
      名古屋大学
    • Year and Date
      2015-09-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] Microstructure and magnetic properties of L10 ordered FePt-C nanogranular films2015

    • Author(s)
      H. Pandey, A. Perumal, L. Wang, Y.K. Takahashi, K. Hono
    • Organizer
      日本磁気学会
    • Place of Presentation
      名古屋大学
    • Year and Date
      2015-09-10
    • Related Report
      2015 Annual Research Report
  • [Presentation] Concentration gradient layer deposition for the columnar growth of FePt-C granular film for Heat Assisted Magnetic Recording media2015

    • Author(s)
      B. Varaprasad, T. Shiroyama, J. Wang, Y.K. Takahashi, K. Hono
    • Organizer
      IEEE International Magnetics Conference
    • Place of Presentation
      China National Convention Center
    • Year and Date
      2015-05-11
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Switching field distribution of FePt-C/FePt exchange coupled granular/continuous perpendicular media2015

    • Author(s)
      J. Wang, Y.K. Takahashi, K. Hono, J.Y. Kim
    • Organizer
      IEEE International Magnetics Conference
    • Place of Presentation
      China National Convention Center
    • Year and Date
      2015-05-11
    • Related Report
      2015 Annual Research Report
    • Int'l Joint Research
  • [Presentation] FePt-Cグラニュラー薄膜におけるAg添加による保磁力増大メカニズム2015

    • Author(s)
      B. Varaprasad、高橋有紀子、J. Wang、城山泰祐、伊奈稔哲、中村哲也、上野若菜、新田清文、宇留賀朋哉、宝野和博
    • Organizer
      日本金属学会 2015年春季講演大会
    • Place of Presentation
      東京大学駒場キャンパス
    • Year and Date
      2015-03-18 – 2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] FePt-Cの微細構造に対する多結晶MgO下地の影響2015

    • Author(s)
      城山泰祐、Varaprasad, B. S. D. Ch. S.、高橋有紀子、宝野和博
    • Organizer
      日本金属学会 2015年春季講演大会
    • Place of Presentation
      東京大学駒場キャンパス
    • Year and Date
      2015-03-18 – 2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effect of MgO underlayer misorientation on the texture and magnetic property of FePt-C granular film2015

    • Author(s)
      J. Wang, S. Hata, B. S. D. Ch. S. Varaprasad, Y. K. Takahashi, T. Shiroyama and K. Hono
    • Organizer
      日本金属学会 2015年春季講演大会
    • Place of Presentation
      東京大学駒場キャンパス
    • Year and Date
      2015-03-18 – 2015-03-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] The influence of MgO seed layer on the microstructure and magnetic properties of FePt-C HAMR media2014

    • Author(s)
      T. Shiroyama, B. S. D. Ch. S.Varaprasad, Y.K. Takahashi and K. Hono
    • Organizer
      MMM 2014
    • Place of Presentation
      Honolulu, Hawaii
    • Year and Date
      2014-11-03 – 2014-11-07
    • Related Report
      2014 Annual Research Report
  • [Presentation] 多結晶MgO下地層によるFePt-Cの微細構造制御2014

    • Author(s)
      城山泰祐、Varaprasad, B. S. D. Ch. S.、高橋有紀子、宝野和博
    • Organizer
      第38回日本磁気学会学術講演会
    • Place of Presentation
      慶應義塾大学
    • Year and Date
      2014-09-02 – 2014-09-05
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effect of MgO seed layer misorientation on the texture and magnetic property of FePt-C granular film2014

    • Author(s)
      J. Wang, S. Hata, B. S. D. Ch. S. Varaprasad, Y. K. Takahashi, T. Shiroyama and K. Hono
    • Organizer
      第38回日本磁気学会学術講演会
    • Place of Presentation
      慶應義塾大学
    • Year and Date
      2014-09-02 – 2014-09-05
    • Related Report
      2014 Annual Research Report
  • [Presentation] Microstructure and Magnetic Properties of FePt-Cr2O3 Granular Films2014

    • Author(s)
      T. Shiroyama, Varaprasad, B. S. D. Ch. S, Y.K. Takahashi and K. Hono
    • Organizer
      Intermag Europe 2014
    • Place of Presentation
      Dresden, Germany
    • Year and Date
      2014-05-08
    • Related Report
      2014 Annual Research Report
  • [Book] Ultra-high density magnetic recording storage materials and media designs2016

    • Author(s)
      Kazuhiro Hono and Yukiko K. Takahashi,
    • Publisher
      Pan Stanford Publishing
    • Related Report
      2016 Annual Research Report

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Published: 2014-04-04   Modified: 2022-02-16  

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