Current-induced magnetization dynamics in disordered itinerant ferromagnets

Yaroslav Tserkovnyak, Hans Joakim Skadsem, Arne Brataas, Gerrit E.W. Bauer

Research output: Contribution to journalArticlepeer-review

132 Citations (Scopus)

Abstract

Current-driven magnetization dynamics in ferromagnetic metals is studied in a self-consistent adiabatic local-density approximation in the presence of spin-conserving and spin-dephasing impurity scattering. Based on a quantum kinetic equation, we derive Gilbert damping and spin-transfer torques entering the Landau-Lifshitz equation to linear order in frequency and wave vector. Gilbert damping and a current-driven dissipative torque scale identically and compete, with the result that a steady current-driven domain-wall motion is insensitive to spin dephasing in the limit of weak ferromagnetism. A uniform magnetization is found to be much more stable against spin torques in the itinerant than in the s-d model for ferromagnetism. A dynamic spin-transfer torque reminiscent of the spin pumping in multilayers is identified and shown to govern the current-induced domain-wall distortion.

Original languageEnglish
Article number144405
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume74
Issue number14
DOIs
Publication statusPublished - 2006

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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