Hybrid Improper Ferroelectricity: A Mechanism for Controllable Polarization-Magnetization Coupling

被引：629

作者：

Benedek, Nicole A. ^{[1
]}

Fennie, Craig J. ^{[1
]}

机构：

[1] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 10期

关键词：

WEAK FERROMAGNETISM; PHASE;

D O I：

10.1103/PhysRevLett.106.107204

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

First-principles calculations are presented for the layered perovskite Ca3Mn2O7. The results reveal a rich set of coupled structural, magnetic, and polar domains in which oxygen octahedron rotations induce ferroelectricity, magnetoelectricity, and weak ferromagnetism. The key point is that the rotation distortion is a combination of two nonpolar modes with different symmetries. We use the term "hybrid" improper ferroelectricity to describe this phenomenon and discuss how control over magnetism is achieved through these functional antiferrodistortive octahedron rotations.

引用

页数：4

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