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Title: Gilbert damping of ferromagnetic metals incorporating inhomogeneous spin dynamics

Abstract

The effects of inhomogeneous spin dynamics on magnetic damping in ferromagnetic metals are studied. On the basis of linear response theory, we derive the microscopic expression for the Gilbert damping term in a two-dimensional electron gas interacting with the magnetization via exchange coupling in the presence of Rashba spin-orbit coupling (SOC). In the spin wave propagating with the wave vector, q, the behavior of q-dependent damping can be explained in terms of both inter- and intra-band spin excitations. The spatially dependent damping torques originating from Rashba SOC that cancel out in a uniform precession system distort the circular orbit of a magnetization-precession trajectory in the presence of inhomogeneous spin dynamics.

Authors:
; ;  [1]
  1. Department of Applied Physics, Tohoku University, Aoba 6-6-05, Aoba-ku, Sendai 980-8579 (Japan)
Publication Date:
OSTI Identifier:
22410137
Resource Type:
Journal Article
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 117; Journal Issue: 17; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; DAMPING; ELECTRON GAS; EXCITATION; FERROMAGNETIC MATERIALS; FERROMAGNETISM; L-S COUPLING; MAGNETIZATION; METALS; PRECESSION; SPIN WAVES; TORQUE; TWO-DIMENSIONAL SYSTEMS

Citation Formats

Umetsu, Nobuyuki, E-mail: umetsu@solid.apph.tohoku.ac.jp, Miura, Daisuke, and Sakuma, Akimasa. Gilbert damping of ferromagnetic metals incorporating inhomogeneous spin dynamics. United States: N. p., 2015. Web. doi:10.1063/1.4916499.
Umetsu, Nobuyuki, E-mail: umetsu@solid.apph.tohoku.ac.jp, Miura, Daisuke, & Sakuma, Akimasa. Gilbert damping of ferromagnetic metals incorporating inhomogeneous spin dynamics. United States. doi:10.1063/1.4916499.
Umetsu, Nobuyuki, E-mail: umetsu@solid.apph.tohoku.ac.jp, Miura, Daisuke, and Sakuma, Akimasa. Thu . "Gilbert damping of ferromagnetic metals incorporating inhomogeneous spin dynamics". United States. doi:10.1063/1.4916499.
@article{osti_22410137,
title = {Gilbert damping of ferromagnetic metals incorporating inhomogeneous spin dynamics},
author = {Umetsu, Nobuyuki, E-mail: umetsu@solid.apph.tohoku.ac.jp and Miura, Daisuke and Sakuma, Akimasa},
abstractNote = {The effects of inhomogeneous spin dynamics on magnetic damping in ferromagnetic metals are studied. On the basis of linear response theory, we derive the microscopic expression for the Gilbert damping term in a two-dimensional electron gas interacting with the magnetization via exchange coupling in the presence of Rashba spin-orbit coupling (SOC). In the spin wave propagating with the wave vector, q, the behavior of q-dependent damping can be explained in terms of both inter- and intra-band spin excitations. The spatially dependent damping torques originating from Rashba SOC that cancel out in a uniform precession system distort the circular orbit of a magnetization-precession trajectory in the presence of inhomogeneous spin dynamics.},
doi = {10.1063/1.4916499},
journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 17,
volume = 117,
place = {United States},
year = {2015},
month = {5}
}