BiFeO_3与FeTiO_3的磁-电耦合的环矩研究
Toroidal moments as indicator for magneto-electric coupling: the case of BiFeO_3 versus FeTiO_3
摘要：
在本文中，我们提出了一个分析的磁环矩及其关系的各种结构模式在R3 c扭曲钙钛矿与磁性阳离子的钙钛矿A或B网站。我们评估的局部磁矩的限制，并表明，充分的磁对称性，可以考虑通过考虑小感应磁矩的氧网站。我们的研究结果给出了一个透明的图片之间的可能耦合的磁化，电极化的强度，和环矩，从而突出了不同的结构扭曲在多铁性BiFeO_3和最近讨论的同构材料FeTiO_3，已被预测表现出电场诱导的磁化翻转所发挥的作用。
英文摘要：
In this paper we present an analysis of the magnetic toroidal moment and its relation to the various structural modes in R3c-distorted perovskites with magnetic cations on either the perovskite A or B site. We evaluate the toroidal moment in the limit of localized magnetic moments and show that the full magnetic symmetry can be taken into account by considering small induced magnetic moments on the oxygen sites. Our results give a transparent picture of the possible coupling between magnetization, electric polarization, and toroidal moment, thereby highlighting the different roles played by the various structural distortions in multiferroic BiFeO_3 and in the recently discussed isostructural material FeTiO_3, which has been predicted to exhibit electric field-induced magnetization switching.
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