TY - JOUR
T1 - Magnetization damping in a local-density approximation
AU - Skadsem, Hans Joakim
AU - Tserkovnyak, Yaroslav
AU - Brataas, Arne
AU - Bauer, Gerrit E.W.
N1 - Copyright:
Copyright 2007 Elsevier B.V., All rights reserved.
PY - 2007/3/14
Y1 - 2007/3/14
N2 - The linear response of itinerant transition-metal ferromagnets to transverse magnetic fields is studied in a self-consistent adiabatic local-density approximation. The susceptibility is calculated from a microscopic Hamiltonian, including spin-conserving impurities, impurity-induced spin-orbit interaction, and magnetic impurities using the Keldysh formalism. The Gilbert damping constant in the Landau-Lifshitz-Gilbert equation is identified, parametrized by an effective transverse spin dephasing rate, and is found to be inversely proportional to the exchange splitting. Our results justify the phenomenological treatment of transverse spin dephasing in the study of current-induced magnetization dynamics in weak, itinerant ferromagnets by Tserkovnyak [Phys. Rev. B 74, 144405 (2006)]. We show that neglect of gradient corrections in the quasiclassical transport equations leads to incorrect results when the exchange potential becomes of the order of the Fermi energy.
AB - The linear response of itinerant transition-metal ferromagnets to transverse magnetic fields is studied in a self-consistent adiabatic local-density approximation. The susceptibility is calculated from a microscopic Hamiltonian, including spin-conserving impurities, impurity-induced spin-orbit interaction, and magnetic impurities using the Keldysh formalism. The Gilbert damping constant in the Landau-Lifshitz-Gilbert equation is identified, parametrized by an effective transverse spin dephasing rate, and is found to be inversely proportional to the exchange splitting. Our results justify the phenomenological treatment of transverse spin dephasing in the study of current-induced magnetization dynamics in weak, itinerant ferromagnets by Tserkovnyak [Phys. Rev. B 74, 144405 (2006)]. We show that neglect of gradient corrections in the quasiclassical transport equations leads to incorrect results when the exchange potential becomes of the order of the Fermi energy.
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U2 - 10.1103/PhysRevB.75.094416
DO - 10.1103/PhysRevB.75.094416
M3 - Article
AN - SCOPUS:33947235060
VL - 75
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 9
M1 - 094416
ER -