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Current-induced magnetization dynamics in disordered itinerant ferromagnets

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

Current-driven magnetization dynamics in ferromagnetic metals are 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 \textit{s}-\textit{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.

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Yaroslav Tserkovnyak, Hans Joakim Skadsem, Arne Brataas, Gerrit E. W. Bauer. 2006-10-26. Current-induced magnetization dynamics in disordered itinerant ferromagnets. https://doi.org/10.1103/physrevb.74.144405

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