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BiFeO3/Ni81Fe19磁性双层膜中的交换偏置及其热稳定性研究*
Exchange bias in BiFeO3/Ni81Fe19 magnetic films and its thermal stability?
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摘要: 研究了磁场诱导生长的BiFeO3/Ni18Fe19磁性双层膜中的交换偏置及其热稳定性.结果表明:BiFeO3/Ni18Fe19双层膜中的交换偏置场Hex未表现出明显的磁练习效应.在负饱和磁场等待过程中, BiFeO3/Ni18Fe19双层膜磁滞回线的前支和后支曲线都随着在负饱和磁场中等待时间tsat的增加向正场方向偏移.交换偏置场Hex的大小随着等待时间tsat的增加而减小,矫顽力Hc基本不变.交换偏置场Hex的大小随测量温度Tm的升高变化不明显,表现出良好的热稳定性;但矫顽力Hc随Tm的升高而显著减小.良好的热稳定性应该来源于铁电性和反铁磁性间的共同耦合作用.Abstract: This paper deals with the exchange bias and its thermal stability in magnetic BiFeO3/Ni81Fe19 bilayer sputtered under an electro-magnetic 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 signif-icantly, 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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