Journal
PHYSICAL REVIEW LETTERS
Volume 102, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.102.256601
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Funding
- Research Council of Norway [158518/143, 158547/431]
- EC [IST-033749]
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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 alpha(w) and the effective out-of-plane spin-transfer torque parameter beta(w) are dominated by spin-orbit interaction in combination with scattering off the domain wall, and not scattering off extrinsic impurities. Numerical calculations give alpha(w)similar to 0.01 and beta(w)similar to 1 in dirty (Ga,Mn)As. The extraordinarily large beta(w) parameter allows experimental detection of current or voltage induced by domain wall motion in (Ga,Mn)As.
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