Hang Li, Xuhui Wang, Fatih Dogan, Aurelien Manchon
We investigate theoretically the current induced spin-orbit torques in III-V diluted magnetic semiconductors, by combining a six-band Kohn-Luttinger Hamiltonian and a linear Dresselhaus spin-orbit coupling. The nonequilibrium spin density and torque are calculated using a Boltzmann equation taking into account transport scattering times obtained from a first-order Born approximation. For two different materials and a wide range of parameters, we scrutinize the angular dependence of the spin torque. We find (1) the spin torque develops a nonlinear dependence on the exchange coupling; (2) a strong correlation between the angular dependence of the torque and the anisotropy of the Fermi surface.
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http://arxiv.org/abs/1211.0867
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