Inverse Spin-Galvanic Effect in the Interface between a Topological Insulator and a Ferromagnet

被引：346

作者：

Garate, Ion ^{[1
,2
]}

Franz, M. ^{[1
]}

机构：

[1] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[2] Canadian Inst Adv Res, Toronto, ON M5G 1Z8, Canada

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 104卷 / 14期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Magnetization reversal - Electric fields - Magnets - Quantum theory - Electric insulators - Ferromagnetism - Superconducting materials;

D O I：

10.1103/PhysRevLett.104.146802

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

When a ferromagnet is deposited on the surface of a topological insulator the topologically protected surface state develops a gap and becomes a two-dimensional quantum Hall liquid. We demonstrate that the Hall current in such a liquid, induced by an external electric field, can have a dramatic effect on the magnetization dynamics of the ferromagnet by changing the effective anisotropy field. This change is dissipationless and may be substantial even in weakly spin-orbit coupled ferromagnets. We study the possibility of dissipationless current-induced magnetization reversal in monolayer-thin, insulating ferromagnets with a soft perpendicular anisotropy and discuss possible applications of this effect.

引用

页数：4

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