Effect of Superconductivity on Magnetoresistance in Ferromagnetic Tunnel Junctions.

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  • Shimazu Yoshihiro
    Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Hodogaya–ku, Yokohama 240–8501, Japan
  • Ishikawa Fumihiro
    Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Hodogaya–ku, Yokohama 240–8501, Japan
  • Yamamoto Isao
    Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Hodogaya–ku, Yokohama 240–8501, Japan
  • Yamaguchi Masuhiro
    Department of Physics, Faculty of Engineering, Yokohama National University, 79–5 Tokiwadai, Hodogaya–ku, Yokohama 240–8501, Japan

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タイトル別名
  • Effect of Superconductivity on Magnetor

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We studied the magnetoresistance of Ni/Al-Al2O3/Co tunnel junctions at T> 1.4 K. Below the superconducting transition temperature of deposited Al films, a nonmonotonic magnetoresistance was observed. The fractional change in junction resistance was 14% at 1.4 K. The nonmonotonic behavior of the magnetoresistance can be explained in terms of the dependences of the superconducting energy gap and the sheet conductivity of the Al layer on the magnetic field. This explanation was supported by the results of an experiment on an Al-Al2O3/Ni tunnel junction which also showed a large magnetoresistance below Tc due to the superconductivity effect.

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