Positive to negative zero-field cooled exchange bias in La0.5Sr0.5Mn0.8Co0.2O3 ceramics

نویسندگان

  • Cui Shang
  • Shaopu Guo
  • Ruilong Wang
  • Zhigang Sun
  • Haibo Xiao
  • Lingfang Xu
  • Changping Yang
  • Zhengcai Xia
چکیده

Exchange bias effect obtained after zero-field cooling from unmagnetized state usually exhibits a shift of hysteresis loop negative to the direction of the initial magnetic field, known as negative zero-field cooled exchange bias. Here, positive zero-field cooled exchange bias is reported in La0.5Sr0.5Mn0.8Co0.2O3 ceramics. In addition, a transition from positive to negative exchange bias has been observed with increasing initial magnetization field and measurement temperature. Based on a simple spin bidomain model with variable interface, two type of interfacial spin configuration formed during the initial magnetization process are proposed to interpret the observed phenomenon.

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عنوان ژورنال:

دوره 6  شماره 

صفحات  -

تاریخ انتشار 2016