Theory of current-driven magnetization dynamics in inhomogeneous ferromagnets

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:320

Article

Tserkovnyak, Yaroslav¹  Brataas, Arne²  Bauer, Gerrit E. W.³ 

[1] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[2] Norwegian Univ Sci & Technol, Dept Phys, NO-7491 Trondheim, Norway

[3] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands

关键词: ferromagnetism;    spin waves;    magnetic domain walls;    spin-polarized transport;    spin transfer;    magnetic instabilities;   

DOI  :  10.1016/j.jmmm.2007.12.012

来源: Elsevier

【 摘 要 】

We give a brief account of recent developments in the theoretical understanding of the interaction between electric currents and inhomogeneous ferromagnetic order parameters. We start by discussing the physical origin of the spin torques responsible for this interaction and construct a phenomenological description. We then consider the electric current-induced ferromagnetic instability and domain-wall motion. Finally, we present a microscopic justification of the phenomenological description of current-driven magnetization dynamics, with particular emphasis on the dissipative terms, the so-called Gilbert damping alpha and the beta component of the adiabatic current-driven torque. (c) 2007 Elsevier B. V. All rights reserved.

【 授权许可】

Free