Temperature dependent exchange bias effect in polycrystalline BiFeO 3 /FM (FM = NiFe, Co) bilayers

Xiaobo Xue, Xueyong Yuan, Wenbin Rui, Qingyu Xu (), Biao You, Wei Zhang, Shiming Zhou and Jun Du ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2013, vol. 86, issue 4, 1-6

Abstract: Extensive studies on the temperature (T) dependent exchange bias effect were carried out in polycrystalline BiFeO 3 (BFO)/NiFe and BFO/Co bilayers. In contrast to single-crystalline BFO/ferromagnet (FM) bilayers, sharp increase of the exchange bias field (H E ) below 50 K were clearly observed in both of these two bilayers. However, when T is higher than 50 K, H E increases with T and decreases further when T is larger than 230 K (for BFO/NiFe) or 200 K (for BFO/Co), which is similar to those reported in single-crystalline BFO/FM bilayers. After the exploration of magnetic field cooling, the temperature dependent exchange bias can be explained considering two contributions from both the interfacial spin-glass-like frustrated spins and the polycrystalline grains in the BFO layer. Moreover, obvious exchange bias training effect can be observed at both 5 K and room temperature and the corresponding results can be well fitted based on a recently proposed theoretical model taking into account the energy dissipation of the AFM layer. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Keywords: Solid State and Materials (search for similar items in EconPapers)
Date: 2013
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DOI: 10.1140/epjb/e2013-31003-y

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