Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 320, Issue 7, Pages 1282-1292Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2007.12.012
Keywords
ferromagnetism; spin waves; magnetic domain walls; spin-polarized transport; spin transfer; magnetic instabilities
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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.
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