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Phys Rev Lett. 2005 Sep 2;95(10):107204. Epub 2005 Sep 2.

Current-spin coupling for ferromagnetic domain walls in fine wires.

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1
Institute for Materials Research, Tohoku University, Sendai, Japan.

Abstract

The coupling between a current and a domain wall is examined. In the presence of a finite current and in the absence of a potential which breaks the translational symmetry, there is a perfect transfer of angular momentum from the conduction electrons to the wall. As a result, the ground state is in uniform motion and this remains the case even when relaxation is included. This is described by, appropriately modified, Landau-Lifshitz-Gilbert equations. The results for a simple pinning model are compared with experiment.

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