Quantum Kinetic Theory of Current-Induced Torques in Rashba Ferromagnets

Abstract

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.

5 pages

References in corpus (5)

• Spin Transfer Torques
• Theory of ferromagnetic (III,Mn)V semiconductors
• Current induced electron spin polarization in strained semiconductors
• Small-angle impurity scattering and the spin Hall conductivity in 2D systems
• Out-of-plane spin polarization from in-plane electric and magnetic fields

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• Microscopic Theory of Rashba Interaction in Magnetic Metal
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• Direct and inverse spin-orbit torques
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• Interfacial contributions to spin-orbit torque and magnetoresistance in ferromagnet/heavy-metal bilayers
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