Prediction of the Magnetotoroidic Effect from Atomistic Simulations

被引：16

作者：

Ren, Wei ^{[1
]}

Bellaiche, L.

机构：

[1] Univ Arkansas, Dept Phys, Fayetteville, AR 72701 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 107卷 / 12期

基金：

美国国家科学基金会;

关键词：

BIFEO3;

D O I：

10.1103/PhysRevLett.107.127202

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

An effective Hamiltonian technique is used to investigate the effect of applying curled electric fields on physical properties of stress-free BiFeO3 dots being under open-circuit electrical boundary conditions. It is discovered that such fields can lead to a control of not only the magnitude but also the direction of the magnetization. Such control originates from the field-induced transformation or switching of electrical vortices and their couplings with oxygen octahedral tilts and magnetic dipoles. This control involves striking intermediate states and constitutes a novel phenomenon that can be termed a "magnetotoroidic" effect.

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