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Exchange bias in BiFeO3/Ni81Fe19 magnetic films and its thermal stability

Zhou Guang-Hong Pan Xuan Zhu Yu-Fu

Exchange bias in BiFeO3/Ni81Fe19 magnetic films and its thermal stability

Zhou Guang-Hong, Pan Xuan, Zhu Yu-Fu
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  • Abstract views:  681
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  • Received Date:  28 November 2012
  • Accepted Date:  08 January 2013
  • Published Online:  05 May 2013

Exchange bias in BiFeO3/Ni81Fe19 magnetic films and its thermal stability

  • 1. Jiangsu Provincial Key Laboratory for Interventional Medical Devices, Huaiyin Institute of Technology, Huaian 223003, China;
  • 2. School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
Fund Project:  Project supported by the National Natural Science Foundation of China (Grant No. 51175212), and Natural Science Foundation of Jiangsu Province, China (Grant No. 2012668).

Abstract: This paper deals with the exchange bias and its thermal stability in magnetic BiFeO3/Ni81Fe19 bilayer sputtered under an electromagnetic field. The results show that the BiFeO3/Ni18Fe19 bilayer presents an in-plane uniaxial magnetic anisotropy and a significant exchange bias effect, however the exchange bias field Hex in the BiFeO3/Ni18Fe19 bilayer does not show a visible training effect. The forward and recoil loop shifts towards positive fields, while holding the film in a negative saturation field. Hex decreases monotonously with the increase in the holding time (tsat), whereas Hc is almost the same. With increasing temperature Tm, Hex will not alter significantly, which means that Hex is not sensitive to the temperature, showing a good thermal stability. However, Hc may reduce rapidly with the increase in temperature. We believe that the good thermal stability may result from the coupling between ferroelectric and antiferromagnetic moments in BiFeO3.

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