High perpendicular exchange bias with a unique temperature dependence in Pt/Co/α-Cr_2O_3(0001) thin films

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  • OIKAWA Hiroto
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • NOUTOMI Hayato
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • FUJITA Toshiaki
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • SHIRATSUCHI Yu
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University
  • NAKATANI Ryoichi
    Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University

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Other Title
  • Pt/Co/α-Cr_2O_3(0001)薄膜における高い垂直交換バイアスとその特異な温度依存性(映像情報機器および一般)
  • Pt/Co/α-Cr2O3(0001)薄膜における高い垂直交換バイアスとその特異な温度依存性
  • Pt Co アルファ Cr2O3 0001 ハクマク ニ オケル タカイ スイチョク コウカン バイアス ト ソノ トクイ ナ オンド イソンセイ

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Abstract

We investigated perpendicular exchange bias of Pt/Co/α-Cr_2O_3(0001) thin films which were fabricated by means of DC magnetron sputtering method. The Pt/Co bilayer which was deposited on α-Cr_2O_3(0001) layer has perpendicular magnetic anisotropy (PMA) and perpendicular exchange bias (PEB). Although PEB is not observed at RT, it appears suddenly at a given temperature, and it had a unique temperature dependence. Unidirectional magnetic anisotropy energy, J_K of about 0.29 erg/cm^2 is obtained. The mechanism of suddenly appearance of J_K is discussed on the basis of Meiklejohn and Bean's exchange anisotropy model.

Journal

  • ITE Technical Report

    ITE Technical Report 35.1 (0), 7-11, 2011

    The Institute of Image Information and Television Engineers

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