Ferromagnetic Damping/Anti-damping in a Periodic 2D Helical Surface; A Nonequilibrium Keldysh Green Function Approach

被引：1

作者：

Mahfouzi, Farzad ^{[1
]}

Kioussis, Nicholas ^{[1
]}

机构：

[1] Calif State Univ Northridge, Dept Phys, Northridge, CA 91330 USA

来源：

SPIN | 2016年 / 6卷 / 02期

基金：

美国国家科学基金会;

关键词：

Spintronics; spin-orbit torque; Gilbert damping; Kyldysh Green function; SPIN-TRANSFER TORQUES; TOPOLOGICAL INSULATORS;

D O I：

10.1142/S2010324716400099

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

In this paper, we investigate theoretically the spin-orbit torque ( SOT) as well as the Gilbert damping for a two band model of a 2D helical surface state with a ferromagnetic ( FM) exchange coupling. We decompose the density matrix into the Fermi sea and Fermi surface components and obtain their contributions to the electronic transport as well as the SOT. Furthermore, we obtain the expression for the Gilbert damping due to the surface state of a 3D topological insulator ( TI) and predict its dependence on the direction of the magnetization precession axis.

引用

页数：7

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