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Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets

Motivated by recent experimental studies of thin-film devices containing a single ferromagnetic layer, we develop a quantum kinetic theory of current-induced magnetic torques in Rashba-model ferromagnets. We find that current-induced spin-densities that are responsible for the switching behavior are due most essentially to spin-dependent quasiparticle lifetimes and derive analytic expressions for relevant limits of a simple model. Quantitative model parameter estimates suggest that spin-orbit coupling in the adjacent metal normal magnetic layer plays an essential role in the strength of the switching effect.

preprint2012arXivOpen access
D. A. PesinA. H. MacDonald
cond-mat.mes-hall
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D. A. PesinA. H. MacDonald

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