Scattering Theory of Charge-Current Induced Magnetization Dynamics

Details Scattering Theory of Charge-Current Induced Magnetization Dynamics Scattering Theory of Charge-Current Induced Magnetization Dynamics

2009-05-26

arxiv.org/abs/0905.4170v2

EPL, 90 (2010) 47002

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version accepted by EPL

Scientific paper

10.1209/0295-5075/90/47002

In ferromagnets, charge currents can excite magnons via the spin-orbit coupling. We develop a novel and general scattering theory of charge current induced macrospin magnetization torques in normal metal$|$ferromagnet$|$normal metal layers. We apply the formalism to a dirty GaAs$|$(Ga,Mn)As$|$GaAs system. By computing the charge current induced magnetization torques and solving the Landau-Lifshitz-Gilbert equation, we find magnetization switching for current densities as low as $ 5\times 10^{6}$~A/cm$^2$. Our results are in agreement with a recent experimental observation of charge-current induced magnetization switching in (Ga,Mn)As.

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