Magnetization damping in a local-density approximation

Hans Joakim Skadsem, Yaroslav Tserkovnyak, Arne Brataas, and Gerrit E. W. Bauer
Phys. Rev. B 75, 094416 – Published 14 March 2007

Abstract

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 et al. [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.

  • Received 22 November 2006

DOI:https://doi.org/10.1103/PhysRevB.75.094416

©2007 American Physical Society

Authors & Affiliations

Hans Joakim Skadsem1,2, Yaroslav Tserkovnyak1,3, Arne Brataas1,2, and Gerrit E. W. Bauer1,4

  • 1Centre for Advanced Study at the Norwegian Academy of Science and Letters, Drammensveien 78, NO-0271 Oslo, Norway
  • 2Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway
  • 3Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA
  • 4Kavli Institute of NanoScience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands

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Issue

Vol. 75, Iss. 9 — 1 March 2007

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