Exchange bias induced by domain walls in BiFeO3

被引：24

作者：

Livesey, K. L. ^{[1
,2
]}

机构：

[1] Univ Western Australia, Sch Phys M013, Crawley, WA 6009, Australia

[2] Univ Colorado, Ctr Magnetism & Magnet Nanostruct, Colorado Springs, CO 80918 USA

来源：

PHYSICAL REVIEW B | 2010年 / 82卷 / 06期

基金：

澳大利亚研究理事会;

关键词：

WEAK FERROMAGNETISM; THIN-FILMS;

D O I：

10.1103/PhysRevB.82.064408

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Recent experiments have measured exchange bias in ferromagnetic/BiFeO3 systems. Bias strength scales with the length of 109 degrees ferroelectric domain walls in the multiferroic BiFeO3 and only a small training effect is observed. In this paper these unusual behaviors are partly accounted for using a one dimensional phenomenological Landau model. It is shown that antiferromagnetic domain walls may be pinned by ferroelectric domain walls in BiFeO3 due to magnetoelectric coupling in the model and may have a net moment due to Dzyaloshinskii-Moriya interaction. Therefore there is a pinned net magnetic moment that can give rise to exchange bias. For Co/BiFeO3, bias is calculated as a function of temperature and domain-wall density and matches well with experiment.

引用

页数：5

共 23 条

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