Current-induced torques in the presence of spin-orbit coupling

Details Current-induced torques in the presence of spin-orbit coupling Current-induced torques in the presence of spin-orbit coupling

2010-07-28

arxiv.org/abs/1007.5037v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 + epsilon pages, 4 figures

Scientific paper

In systems with strong spin-orbit coupling, the relationship between spin-transfer torque and the divergence of the spin current is generalized to a relation between spin transfer torques, total angular momentum current, and mechanical torques. In ferromagnetic semiconductors, where the spin-orbit coupling is large, these considerations modify the behavior of the spin transfer torques. One example is a persistent spin transfer torque in a spin valve: the spin transfer torque does not decay away from the interface, but approaches a constant value. A second example is a mechanical torque at single ferromagnetic-nonmagnetic interface.

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