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1996 Fiscal Year Final Research Report Summary

Microstructured Magnetcoelectronic Devices Based on Spin Dependent Electron Scattering with Magnetic Multilayrs

Research Project

Project/Area Number 06452231
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 電子デバイス・機器工学
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

MATSUYAMA Kimihide  Kyushu Univ., Graduate School of Information Science and Electrical Engineering, Associate Professor, 大学院・システム情報科学研究科, 助教授 (80165919)

Co-Investigator(Kenkyū-buntansha) ASADA Hironori  Kyushu Univ., Graduate School of Information Science and Electrical Engineering,, 大学院・システム情報科学研究科, 助手 (70201887)
Project Period (FY) 1994 – 1996
KeywordsMagnetic Thin Film / Grant Magnetoresistance Effect / Spin Valve / Magnetic Tunneling Effect / Spin Dependent Electron Scattering
Research Abstract

Microstructured magnetoelectronic (ME) devices, composed of uncoupled magnetic multilayrs, have been fabricated with lithographic techniques. Fundamental device performance, based on the spin dependent electron transport, have been studied.
1. Sensitive spin valve effect in microstructured multilayrs. --- Highly sensitive magnetoresistance (MR) change of 6% for the external field of 20 Oe was attained in a microstructured strip pattern of Ni-Fe/Cu/Co and based multilayr, deposited with an electron beam evaporation Magnetostatic shape effects were clarified from the MR measurements of strip patterns with various pattern widths down to 0.4 mum, which were structured with a direct electron beam lithography and Ar ion milling.
2. Fabrication of corrent perpendicular to plane (CPP) ME devices. --- Microfabrication processes for CPP-ME devices with three dimentional electrodes been developed. MR change of 8 mOMEGA was observed at room temperature for a ferromagnetic tunnel junction of Co/Cu/CuO/Co, which tunnel barrier CuO was formed with in-situ rf plasma oxidation. MR effects were also observed in CPP-ME devices with a-Si or a-Ge as nonmagnetic layrs, which suggest the spin dependent electron transport in amorphous semiconductors.
3. Development of magnetic random access memory (M-RAM). ---A M-RAM memory cell composed of evaporated Ni-Fe/Co/Cu/Co with lateral size of 2*5 mum^2 and an overlaid conductor pattern was designed and fabricated. High speed bistable bit state change (write operation) was performed with conductor current of 20 ns pulse width, and electrically detected by MR measurement (read operation).

  • Research Products

    (22 results)

All Other

All Publications (22 results)

  • [Publications] K.Matsuyama: "Successive Bloch Line Write Operation in a 1 μm Bubble Material" Journal of Applied Physics. 75. 6086-6088 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Asada: "Micromagnetic Computation for Wall and Bloch Line Coercivity in Thin Film with Perpendicular Anisotropy" Journal of Applied Physics. 75. 6089-6091 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] B.B.Pant: "One-Dimensional Model of Magnetic Domain Wall with Self-Induced Anisotropy" Japanese Journal of Applied Physics. 34. 4779-4785 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: "Fabrication of Microstructured Magnetic Tunneling Valve Junction" IEEE Transactions on Magnetics. 31. 3176-3178 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: "Magnetoresistance Behavior in Microfabicated Trilayer Strip Pattern" Journal of Magnetism and Magnetic Materials. 156. 301-302 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: "Perpendicular Spin Valve Behavior in a Microstructured Co/Cu-Cu Oxide trilayer" Journal of Applied Physics. 79. 5318-5320 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.J.Fogarty: "Fundamental Studies of Stripe-Domain Chopping in the Presence of Magnetic Fields" Journal of Applied Physics. 79. 6643-6645 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Asada: "Micromagnetic Study on Write Operation in Sub-micron Magnetic Random Access Memory" Journal of Applied Physics. 79. 6646-6648 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] H.Asada: "Micromagnetic Study on Dynamic Properties of Write Operation in Magnetic Random Access Memory Cell" IEEE Transactions on Magnetics. 32. 4001-4003 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: "High Senstive Magnetoresistance in Evaporated Spin Valves with Growth-Induces Uniaxial Anisotropy" IEEE Transactions on Magnetics. 32. 4612-4614 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: "Spin Dependent Transport Perpendicular to CoPt/S/Co(S=Si,Ge)Trilayers" Journal of Applied Physics. 81(印刷中). (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] K.Matsuyama: ""Successive Bloch Line Write Operation in a 1mum Bubble Material"" Journal of Applied Physics. Vol.75. 6086-6088 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Asada: ""Micromagnetic Computation for Wall and Bloch Line Coercivity in Thin Film with Perpendicular Anisotropy"" Journal of Applied Physics. Vol.75. 6089-6091 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] B.B.Pant: ""One-Dimentional Model of Magnetic Domain Wall with Self-Induced Anisotropy"" Japanese Journal of Applied Physics. Vol.34. 4779-4785 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Matsuyama: ""Fabrication of Microstructured Magnetic Tunneling Valve Junction"" IEEE Transactions on Magnetics. Vol.31. 3176-3178 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Matsuyama: ""Magnetoresistance Bahvior in Microfabricated Trilayr strip Pattern"" Journal of Magnetism and Magnetic Materials. Vol.156. 301-302 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Matsuyama: ""Perpendicular Spin Valve Behavior in a Microstructured Co/Cu-Cu oxide/Co Trilayr"" Journal of Applied Physics. Vol.79. 5318-5320 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.J.Fogarty: ""Fundamental Studies of Stripe-Domain Chopping in the Presence of Magnetic Fields"" Journal of Applied Physics. Vol.79. 6643-6645 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Asada: ""Micromagnetic Study on Write Operation in Submicron Magnetic Random Access Memory Cell"" Journal of Applied Physics. Vol.79. 6646-6648 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] H.Asada: ""Micromagnetic Study on Dynamic Properties of Write Operation in Magnetic Random Access Memory Cell"" IEEE Transactions on Magnetics. Vol.32. 4001-4003 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Matsuyama: ""High Sensitive Magnetoresistance in Evaporated Spin Valves with Growth-Induces Uniaxial Anisotropy"" IEEE Transactions on Magnetics. Vol.32. 4612-4614 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] K.Matsuyama: ""Spin Dependent Transport Perpendicular to CoPt/S/Co (S=Si, Ge) Trilayrs"" Journal of Applied Physics. Vol.81(printing).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-09  

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