Mechanisms of exchange bias with multiferroic BiFeO3 epitaxial thin films
Mechanisms of exchange bias with multiferroic BiFeO3 epitaxial thin films
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DOI：
10.1103/physrevlett.100.017204
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发表时间：
2008-01-11
影响因子：
8.6
通讯作者：
Barthelemy, A.
中科院分区：
文献类型：
--
作者：
Bea, H.;Bibes, M.;Barthelemy, A.
结合中子散射和压电响应力显微镜，我们发现CoFeB/BiFeO_3异质结中的交换场与BiFeO_3薄膜的铁电和反铁磁畴尺寸成反比，正如Malozemoff的交换偏置模型扩展到多铁材料所预期的那样。相应地，偏振中子反射仪显示在与CoFeB的界面处BiFeO_3薄膜中存在未补偿的自旋。鉴于这些结果，我们讨论了利用BiFeO_3电场转换铁磁体磁化强度的可能策略。
We have combined neutron scattering and piezoresponse force microscopy to show that the exchange field in CoFeB/BiFeO3 heterostructures scales with the inverse of the ferroelectric and antiferromagnetic domain size of the BiFeO3 films, as expected from Malozemoff's model of exchange bias extended to multiferroics. Accordingly, polarized neutron reflectometry reveals the presence of uncompensated spins in the BiFeO3 film at the interface with CoFeB. In view of these results, we discuss possible strategies to switch the magnetization of a ferromagnet by an electric field using BiFeO3.