Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
Weak ferromagnetism and magnetoelectric coupling in bismuth ferrite
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DOI：
10.1103/physrevb.71.060401
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发表时间：
2005-02-01
影响因子：
3.7
通讯作者：
Spaldin, NA
中科院分区：
文献类型：
--
作者：
Ederer, C;Spaldin, NA
在局域自旋密度近似下，用密度泛函理论和LSDA+U方法分析了磁电多铁体BiFeO(3)中铁电序参数和磁序参数之间的耦合。我们发现在这种材料中存在Dzyaloshinskii-Moriya类型的弱铁磁性，并分析了由此产生的磁化强度与结构扭曲之间的耦合。我们探索了电场诱导磁化反转的可能性，并表明，尽管在BiFeO(3)中不太可能实现，但总体上并不是不可能的。最后，我们概述了利用电场实现磁化转换所必须满足的条件。
We analyze the coupling between the ferroelectric and magnetic order parameters in the magnetoelectric multiferroic BiFeO(3) using density functional theory within the local spin density approximation (LSDA) and the LSDA+U method. We show that weak ferromagnetism of the Dzyaloshinskii-Moriya type occurs in this material, and we analyze the coupling between the resulting magnetization and the structural distortions. We explore the possibility of electric-field-induced magnetization reversal and show that, although it is unlikely to be realized in BiFeO(3), it is not in general impossible. Finally, we outline the conditions that must be fulfilled to achieve switching of the magnetization using an electric field.