title: Intrinsic coupling between current and domain wall motion in (Ga,Mn)As.
abstract: We consider current-induced domain wall motion and, the reciprocal process, moving domain wall-induced current. The associated Onsager coefficients are expressed in terms of scattering matrices. Uncommonly, in (Ga,Mn)As, the effective Gilbert damping coefficient alphaw and the effective out-of-plane spin-transfer torque parameter betaw are dominated by spin-orbit interaction in combination with scattering off the domain wall, and not scattering off extrinsic impurities. Numerical calculations give alphaw approximately 0.01 and betaw approximately 1 in dirty (Ga,Mn)As. The extraordinarily large betaw parameter allows experimental detection of current or voltage induced by domain wall motion in (Ga,Mn)As.
authors: Department of Physics, Norwegian University of Science and Technology, NO-7491, Trondheim, Norway.
authors: Kjetil Magne Dørheim
authors: KM
authors: Hals
authors: Anh Kiet
authors: AK
authors: Nguyen
authors: Arne
authors: A
authors: Brataas