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In a ferromagnetic heterostructure, the interplay between a Rashba spin-orbitcoupling and an exchange field gives rise to a current-driven spin torque. In arealistic device setup, we investigate the Rashba spin torque in the diffusiveregime and report two major findings: (i) a nonvanishing torque exists at theedges of the device even when the magnetization and effective Rashba field arealigned; (ii) anisotropic spin relaxation rates driven by the Rashba spin-orbitcoupling assign the spin torque a general expression ${\bmT}=T^y_{\para}(\theta){\bm m}\times(\hat{\bm y}\times{\bmm})+T^y_{\bot}(\theta)\hat{\bm y}\times{\bm m}+T^z_{\para}(\theta){\bmm}\times(\hat{\bm z}\times{\bm m})+T^z_{\bot}(\theta)\hat{\bm z}\times{\bm m}$,where the coefficients $T_{\para,\bot}^{y,z}$ depend on the magnetizationdirection. Our results agree with recent experiments.

Angular dependence and symmetry of Rashba spin torque in ferromagnetic heterostructures