Xuhui Wang, Christian Ortiz Pauyac, Aurelien Manchon
In a two-dimensional ferromagnetic metal film lacking inversion symmetry, the itinerant electrons mediate the interaction between the Rashba spin-orbit interaction and the ferromagnetic order parameter, leading to a Rashba spin torque exerted on the magnetization. Using Keldysh technique, in the presence of both magnetism and spin-orbit coupling, we derive a spin diffusion equation that provides a coherent description to the diffusive spin dynamics. The characteristics of the spin torque and its implication on magnetization dynamics are discussed for a wide range of relative strength between Rashba spin-orbit coupling and the ferromagnetic exchange.
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http://arxiv.org/abs/1206.6726
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