Giant Ferroelectric Polarization of CaMn7O12 Induced by a Combined Effect of Dzyaloshinskii-Moriya Interaction and Exchange Striction

被引：109
|
作者：
Lu, X. Z. [1 ,2 ]
Whangbo, M. -H. [3 ]
Dong, Shuai [4 ]
Gong, X. G. [1 ,2 ]
Xiang, H. J. [1 ,2 ]
机构：
[1] Fudan Univ, Key Lab Computat Phys Sci, Minist Educ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China
[2] Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China
[3] N Carolina State Univ, Dept Chem, Raleigh, NC 27695 USA
[4] Southeast Univ, Dept Phys, Nanjing 211189, Jiangsu, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 18期
关键词：
ANISOTROPIC SUPEREXCHANGE INTERACTION; MULTIFERROICS;
D O I：
10.1103/PhysRevLett.108.187204
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
By extending our general spin-current model to noncentrosymmetric spin dimers and performing density functional calculations, we investigate the causes for the helical magnetic order and the origin of the giant ferroelectric polarization of CaMn7O12. The giant ferroelectric polarization is proposed to be caused by the symmetric exchange striction due to the canting of the Mn4+ spin arising from its strong Dzyaloshinskii-Moriya interaction. Our study suggests that CaMn7O12 may exhibit a novel magnetoelectric coupling mechanism in which the magnitude of the polarization is governed by the exchange striction, but the direction of the polarization by the chirality of the helical magnetic order.
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页数：5
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