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Microstructure control of nitride magnetoresistor in nano granular type

Research Project

Project/Area Number 17350096
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Inorganic industrial materials
Research InstitutionHokkaido University

Principal Investigator

KIKKAWA Shinichi  Hokkaido Univ., Grad. School of Eng., Prof, 大学院工学研究科, 教授 (10127219)

Co-Investigator(Kenkyū-buntansha) TAKEDA Takashi  Hokkaido Univ., Grad. School of Eng., Assistant Prof., 大学院工学研究科, 助手 (60344488)
Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥15,600,000 (Direct Cost: ¥15,600,000)
Fiscal Year 2006: ¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 2005: ¥10,300,000 (Direct Cost: ¥10,300,000)
Keywordsspin-electronics / ceramics / nano material / inorganic industrial chemistry / magnetic recording / iron nitride / cobalt nitride / granular
Research Abstract

Magnetic sensors are important for information technology especially in pick up system of hard disk drive. Magnetoresistor with large MR ratio is required for its high sensitivity. Nitrides of post transition metals such as Fe, Co, Ni are thermally metastable to precipitate the ferromagnetic metal particles. Their annealed products would be magnetoresistors in granular type. In the present study, precipitation behavior and magnetoresistance were studied on their sputter deposited thin films in their post annealing.
Iron nitrides, γ'''-FeN_x, (0.5≦x≦0.7) with defect rock-salt type and γ''-FeN_y (0.8≦x≦0.9) with zinc blende type were obtained in reaction sputter deposition at 1Pa and 5Pa of nitrogen pressure, respectively. α-Fe gradually precipitated in their annealing above 450℃. Negative magnetoresistance was observed on the films formed as mixtures with Fe_3N.
Zinc blende CoN film was obtained in a sputter deposition at 5Pa. Its thermal decomposition started at 300℃ through Co_2N and directly to α-Co metal above 350℃. Positive MR was found out on the Co film due to its magnetic anisotropy.
Nitride thin film prepared using Fe_70Co_30 target was a single phase with zinc blende structure. Ferromagnetic Fe_70Co_30 particles started to precipitate in an annealing at 350℃. Negative MR effect appeared with the precipitation of ferromagnetic particles. Positive MR effect was also observed on the annealed films at higher temperature. Crystallinity of the Fe_70Co_30 alloy improved with the annealing temperature.

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (9 results)

All 2007 2006 2005

All Journal Article (6 results) Book (1 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Preparation of magneto-resistive Sr_2FeMoO_6 through molybdic acid gelation2007

    • Author(s)
      T.Takeda
    • Journal Title

      J. Alloys and Compounds (in press)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Nanostructured functional nitride ceramics, "Handbook of Nanoceramics and Their Based Nanodevices2007

    • Author(s)
      S.Kikkawa
    • Journal Title

      American Scientific Publishers (in press)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Preparation of magneto-resistive Sr_2FeMoO_6 through molybdic acid gelation2007

    • Author(s)
      T.Takeda, M.Ito, S.Kikkawa
    • Journal Title

      J. Alloys and Compounds (in press)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Magnetoresistance of post-annealed iron nitride related thin films2006

    • Author(s)
      S.Kikkawa
    • Journal Title

      Advances in Science and Technology 52

      Pages: 70-74

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Magnetoresistance of post-annealed iron nitride related thin films2006

    • Author(s)
      S.Kikkawa, K.Sakon, Y.Kawaai, T.Takeda
    • Journal Title

      Advances in Science and Technology 52

      Pages: 70-74

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Preparation of magneto-resistive Sr_2FeMoO_6 through molybdic acid gelation2006

    • Author(s)
      T.Takeda, M.Ito, S.Kikkawa
    • Journal Title

      J.Alloy and compound (in press)

    • Related Report
      2005 Annual Research Report
  • [Book] Nanostructured fuctional nitride ceramics, "Handbook of Nanoceramics and Their Based Nanodevices2007

    • Author(s)
      S.Kikkawa
    • Publisher
      American Scientific Publishers(in press)
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Patent(Industrial Property Rights)] 磁気抵抗体、その製造方法、及びその利用2005

    • Inventor(s)
      吉川信一, 武田隆史
    • Industrial Property Rights Holder
      北海道大学
    • Industrial Property Number
      2005-038462
    • Filing Date
      2005-02-15
    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Patent(Industrial Property Rights)] 時期抵抗体、その製造方法、及びその利用2005

    • Inventor(s)
      吉川 信一, 武田 隆史
    • Industrial Property Rights Holder
      北海道大学
    • Industrial Property Number
      2005-038462
    • Filing Date
      2005-02-15
    • Related Report
      2005 Annual Research Report

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Published: 2005-04-01   Modified: 2016-04-21  

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