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Composite magnetic films for ultrahigh density opt-magnetic hybrid recording (Approach from magneto optical recording film)

Research Project

Project/Area Number 16360182
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionNihon University

Principal Investigator

ITOH Akiyoshi  Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (60059962)

Co-Investigator(Kenkyū-buntansha) NAKAGAWA Katsuji  Nihon University, College of Science and Technology, Professor, 理工学部, 教授 (20221442)
OTSUKI Joe  Nihon University, College of Science and Technology, Assistant Professor, 理工学部, 助教授 (80233188)
TSUKAMOTO Arata  Nihon University, College of Science and Technology, Assistant Professor, 理工学部, 講師 (30318365)
Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥15,300,000 (Direct Cost: ¥15,300,000)
Fiscal Year 2005: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2004: ¥12,500,000 (Direct Cost: ¥12,500,000)
KeywordsStabilization of tiny magnetic domain / SiO_2 substrate having self organized nano-scale pores / FePt particulate / Composite films / Non-linear magneto optical effect / Opt-magnetic hybrid recording / Rapid-thermal annealing method / Femto second pulse laser / 自己配列極微小孔SiOx薄膜
Research Abstract

We have succeeded to obtain perpendicular magnetized films consists of small grains of FePt by using a rapid thermal annealing : RTA method on to thermally oxidized SiO_2 thin films on Si substrates. As deposited films of FePt by sputtering method are continuous films, however after RTA they become small grains of (001) oriented L1_0 phase crystalline structure showing a perpendicular magnetization. The average grain diameter is strongly depended on the film thickness of as sputtered film before RTA.
TbFeCo film is fabricated on isolated FePt grains to increase the domain wall coercivity (Hw) of TbFcCo film by exchange coupling effect between TbFeCo and FePt The transition metal(TM) moment has a dominant charge in TbFeCo film langing from room temperature (Troom) to Curie temperature. The FePt has average grain sizes such as 29.6, 16.6 and 7.0 nm in diameter, which are perpendicularly magnetized with a high coercivity (Hc), as high as 30-45 kOe at Troom. The TbFeCo/FePt composite film shows higher Hw, Hc and MsHw than those of the singe ayer of TbFeCo film. We also estimate the amount of interfacial wal energy between TbFeCo and FePt.
We succeeded to fabricate SiO_2 film having nano-hollowws inside and show that the spatter etching is effective to crop out the nano-dent array at the surface. The highly ordered structure of the nano-pore thin film is formed by ordering of self-assembled triblock copolymer micelles.
Two complementary methods, namely the magneto-optical Kerr effect (MOKE) and magnetically induced optical second harmonic generation (MSHG) were used to detect the magnetization behavior in the bulk of the film and at its interfaces, respectively. A clear difference between the two methods was observed that could only be related to the different magnetic behavior in the bulk and at the interfaces of the film.

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (23 results)

All 2006 2005 2004

All Journal Article (23 results)

  • [Journal Article] フェムト秒レーザーを用いたGdFeCo薄膜磁化動特性観察・制御2006

    • Author(s)
      塚本新, 西村純平, 伊藤彰義, D.Stanciu, A.Kimel, F.Hansteen, A.Kirilyuk, T.Rasing
    • Journal Title

      電子情報通信学会信学技報 30巻11号

    • NAID

      10017963013

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Annual Research Report 2005 Final Research Report Summary
  • [Journal Article] Cu doping effect on FePt grains prepared by rapid thermal nnealing on SiO_2 substrate and wall structure in TbFeCo/FePt CGC-like film2006

    • Author(s)
      A.Itoh, Y.Itoh, K.Nanba, Y.Adachi, M.Motohashi, A.Tsukamoto
    • Journal Title

      Journal of Applied Physics 99巻

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ultrafast spin dynamics across compensation points in ferrimagnetic GdFeCo : The role of angular momentum compensation2006

    • Author(s)
      D.Stanciu, A.Kimel, F.Hansteen, A.Tsukamoto, A.Itoh, A.Kirilyuk, T.Rasing
    • Journal Title

      Physical Review B 73巻11号

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Cu doping effect on FePt grains prepared by rapid thermal annealing on SiO_2 substrate and wall structure in TbFeCo/FePt CGC-like film2006

    • Author(s)
      A.Itoh, Y.Itoh, K.Nanba, Y.Adachi, M.Motohashi, A.Tsukamoto
    • Journal Title

      Journal of Applied Physics Vol 99

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Ultrafast spin dynamics across compensation points in ferri magnetic GdFeCo : The role of angular momentum compensation2006

    • Author(s)
      D.Stanciu, A.Kimel, F.Hansteen, A.Tsukamoto, A.Itoh, A.Kirilyuk, T.Rasing
    • Journal Title

      Physical Review B Vol 73(11)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 高速昇温熱処理におけるFePt微粒子膜の作製2005

    • Author(s)
      伊藤彰義, 伊藤祐二, 塚本新, 中川活二
    • Journal Title

      電子情報通信学会信学技報 29巻39号

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Small Grain FePt Films Prepared by Rapid Thermal Annealing2005

    • Author(s)
      A.Itoh, Y.Itoh, A.Tsukamoto, K.Nakagawa
    • Journal Title

      Technical Report Of IEICE Vol 29(39)

    • NAID

      110003224874

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Observation and Control of Ultrafast Dynamics of GdFeCo Thin Films by Femto Second Pulse Laser2005

    • Author(s)
      A.Tsukamoto, J.Nishimura, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, Th.Rasing
    • Journal Title

      Technical Report Of IEICE Vol 30(11)

    • NAID

      10017963013

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 高速昇温熱処理によるFePt微粒子膜の作製2005

    • Author(s)
      伊藤彰義, 伊藤祐二, 塚本新, 中川活二
    • Journal Title

      電子情報通信学会信学技報 29巻39号

    • NAID

      110003224874

    • Related Report
      2005 Annual Research Report
  • [Journal Article] Excitation of coherent spin waves at ultrafast thermomagnetic writing2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, Th.Rasing
    • Journal Title

      IEEE Trans. Magn. 40巻4号

      Pages: 2543-2545

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dynamic Observation of Domain Shrinking Speed Over Walker's Limit2004

    • Author(s)
      F.Izawa, S.Ozawa, A.Tsukamoto, K.Nakagawa, A.Itoh
    • Journal Title

      Trans. Magn. Soc. Jpn. 4巻4号

      Pages: 314-317

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Theoretical Analysis of Critical Domain Size for Quadri-Value Recording Media2004

    • Author(s)
      T.Fujii, K.Nakagawa, A.Itoh
    • Journal Title

      Transactions of the Magnetic Society of Japan 4巻4号

      Pages: 182-185

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magnetic Characteristics of TbFeCo Fabricated on Isolated FePt Thin Film2004

    • Author(s)
      Y.Itoh, A.Tsukamoto, K.Nakagawa, A.Itoh
    • Journal Title

      Trans. Magn. Soc. Jpn. 4巻4号

      Pages: 213-216

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitation of Coherent Spin Waves in GdFeCo Film2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, T.Rasing
    • Journal Title

      Transactions of the Magnetic Society of Japan 4巻4号

      Pages: 322-325

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitation of coherent spin waves at ultrafast thermomagnetic writing2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, Th.Rasing
    • Journal Title

      IEEE Trans. Magn. Vol 40(4)

      Pages: 2543-2545

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Dynamic Observation of Domain Shirinking Speed Over Walker's Limit2004

    • Author(s)
      F.Izawa, S.Ozawa, A.Tsukamoto, K.Nakagawa, A.Itoh
    • Journal Title

      Trans. Magn. Soc. Jpn. Vol 4(4)

      Pages: 314-317

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Theoretical Analysis of Critical Domain Size for Quadri-Value Recording Media2004

    • Author(s)
      T.Fujii, K.Nakagawa, A.Itoh
    • Journal Title

      Trans. Magn. Soc. Jpn. Vol 4(4)

      Pages: 182-185

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Magnetic Characteristics of TbFeCo Fabricated on Isolated FePt Thin Film2004

    • Author(s)
      Y.Itoh, A.Tsukamoto, K.Nakagawa, A.Itoh
    • Journal Title

      Trans. Magn. Soc. Jpn. Vol 4(4)

      Pages: 213-216

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitation of Coherent Spin Waves in GdFeCo Film2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, T.Rasing
    • Journal Title

      Trans. Magn. Soc. Jpn. Vol 4(4)

      Pages: 322-325

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Excitation of Coherent Spin Waves in GdFeCo Film2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, T.Rasing
    • Journal Title

      Transactions of the Magntic Society of Japan 4・4

      Pages: 322-325

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Excitation of coherent spin waves at ultrafast thermomagnetic writing2004

    • Author(s)
      A.Tsukamoto, K.Nakagawa, A.Itoh, A.Kimel, A.Tsvetkov, H.Awano, N.Ohta, A.Kirilyuk, T.Rasing
    • Journal Title

      IEEE Transactions on Magnetics 40・4

      Pages: 2543-2545

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Theoretical Analysis of Critical Domain Size for Quadri-Value Recording Media2004

    • Author(s)
      T.Fujii, K.Nakagawa, A.Itoh
    • Journal Title

      Transactions of the Magnetic Society of Japan 4・4

      Pages: 182-185

    • Related Report
      2004 Annual Research Report
  • [Journal Article] Dynamic Observation of Domain Shirinking Speed Over Walker's Limit2004

    • Author(s)
      F.Izawa, S.Ozawa, A.Tsukamoto, K.Nakagawa, A.Itoh
    • Journal Title

      Transactions of the Magnetic Society of Japan 4・4

      Pages: 314-317

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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