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Study on spin-valve type multi-value memory using spin glass/ferromagnetic exchange coupled thin film

Research Project

Project/Area Number 10650017
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Applied materials science/Crystal engineering
Research InstitutionKeio University

Principal Investigator

SATO Tetsuya  Faculty of Science & Technology, Keio University, Associate Profesor, 理工学部, 助教授 (20162448)

Project Period (FY) 1998 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1998: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsSpin glass / Spin valve / exchange coupled thin film / Multi-value memory / Magneto-resistance / 磁性多層膜 / 交換結合 / 磁気異方性
Research Abstract

Magnetic anisotropy and the magnetic phase transition temperature in reentrant spin glass NiMn/Cu multilayer and NiMn/Cu/Ni trilayer films were investigated to fabricate a spin valve type memory. For the trilayer film, the field dependent magneto-resistance was measured to discuss the possible contribution from the giant magneto-resistance (GMR) effect.
NiMn/Cu multilayer and NiMn/Cu/Ni trilayer film were prepared using the Ar ion-beam sputtering method in an ultra high vacuum chamber. The magnetic anisotropy was estimated using a superconducting quantum interference device (SQUID) magnetometer.
The magnetic phase transition temperatures decrease with decreasing the film thickness in NiMn/Cu multilayer sample. When the sample was annealed, however, the ferromagnetic phase transition temperature increased. This indicates that the ferromagnetic magnetization of the annealed NiMn sample is maintained up to a higher temperature compared with the non-annealed sample. In addition, the magnetic anisotropy field was analyzed as a function of the thickness of the Cu layer in the trilayer sample. As a result, we found that a magnetic coupling between NiMn and Ni layers becomes pronounced when the thickness of Cu layer is thinner than a thickness between 30 and 59 AィイD4゜ィエD4. This is an important information to fabricate the GMR trilayer film in which the decoupling between the magnetic layers is required. The GMR effect could not be confined because the contribution from the anisotropic magneto resistance is significant in the trilayer sample, due to the small difference of the resistance among the three layers.

Report

(3 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • Research Products

    (21 results)

All Other

All Publications (21 results)

  • [Publications] Tetsuya Sato: "Chiral-like spin ordering in Ni(Pt, Pd) Mn"J. Magn. Magn. Mater. 177-181. 101-102 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Itoh and T. sato: "Peculiar decay of thermoremanent magnetization observed in Fe doped Ca0.62Mn0.38Te"J. Magn. Soc. Japan. 23. 507-509 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Sato and K. Morita: "The magnetic phase diagram of the itinerant-electron-type helical-spin-glass re-entrant magnet Cr0.81Mn0.19Ge"J. Phys. Condens. Matter. 11. 4231-4249 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Sato, M. Furusak, M. Takada: "Magnetization process of itinerant-electron-type helical-spin-glass reentrant magnet Cr0.81Mn0.19Ge observed on various spatial scales"J. Magn. Magn. Mater. 195. 345-361 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kawai and T. Sato: "Magnetic response of Cd0.63Mn0.37Te under illumination: Dynamic behavior of spin glass with step-like heating and cooling"J. Appl. Phys.. 85. 7310-7315 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Ogawa and T. Sato: "Magnetic anisotropy of NiNm/Ni and NiMn/Cu/Ni thin films"Acta Physica Pilonica A. 97(in press).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tetsuya Sato: "Chiral-like spin ordering in Ni(Pt, Pd)Mn"J. Magn. Magn. Mater. 177-181. 101-102 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T.Itoh and T. Sato: "Peculiar decay of magnetization observed in Fe doped Cd0.62Mn0.38Te"J. Magn. Soc. Japan. 23. 507-509 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Sato and K. Mori: "The magnetic phase diagram of the itinerant-electron-type helical-spin-glass re-entrant magnet Cr0.81Mn0.19Ge"J. Phys.: Condens. Matter. 11. 4231-4249 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Sato, M, Furusaka and M. Takeda: "Magnetization process of itinerant-electron-type helical-spin-glass reentrant magnet Cr0.81Mn0.19Ge observed on various spatial scales"J. Magn. Magn. Mater. 195. 345-361 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] H. Kawai and T. Sato: "Magnetic response of Cd0.63Mn0.37Te under illumination: Dynamic behavior of spin glass with step-like heating and cooling"J. Appl. Phys.. 85. 7310-7315 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] T. Ogawa and T. Sato: "Magnetic anisotropy of NiMn/Ni and NiMn/Cu/Ni thin films"Acta Physica Polonica A. 97(in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Tetsuya Sato: "Chiral-like spin ordering in Ni(Pt,Pd)Mn"J.Magn.Magn.Mater.. 177-181. 101-102 (1998)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Itoh and T.Sato: "Peculiar decay of thermoremanent magnetization observed in Fe doped Cd0.62Mn0.38Te"J.Magn.Soc.Japan. 23(1-2). 507-509 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Sato and K.Morita: "The magnetic phase diagram of the itinerant-electron-type helical-spin-glass re-entrant magnet Cr0.81Mn0.19Ge"J.Phys.:Condens.Matter. 11(21). 4231-4249 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Sato,M.Furusaka,M.Takeda: "Magnetization process of itinerant-electron-type helical-spin-glass reentrant magnet Cr0.81Mn0.19Ge observed on various spatial scales"J.Magn.Magn.Mater.. 195. 345-361 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] H.Kawai,T.Sato: "Magnetic response of Cd0.63Mn0.37Te under illumination:Dynamic behavior of spin glass with step-like heating and cooling"J.Appl.Phys.. 85(10). 7310-7315 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 伊藤 巧: "Peculiar decay of thermoremanent magnetization observed in Fe doped Ca_<0.62>Mn_<0.38>Te" the Journal of the Magnetics Socrety of Japan. 23. 507-509 (1999)

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤 徹哉: "Magnetization process of helical-spin-glass reentrant magnet Cr_<0.81>Mn_<0.19>Ge observed on various spatial scales" Journal of Magntism and Magnetic Materials. (掲載可).

    • Related Report
      1998 Annual Research Report
  • [Publications] 河合 英紀: "Magnetic respons of Cd_<0.63>Mn_<0.37>Te under illumination : Dynamic behavior of spin glass with step-like heating and cooling" Journal of Applied Physics. (掲載可).

    • Related Report
      1998 Annual Research Report
  • [Publications] 佐藤 徹哉: "Magnetic phase diagram of itinerant-electron-type helical-spin-glass reentrant magnet Cr_<0.81>Mn_<0.19>Ge" Journal of Physics : Condensed Matter. (掲載可).

    • Related Report
      1998 Annual Research Report

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Published: 1998-04-01   Modified: 2016-04-21  

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