title: Current-spin coupling for ferromagnetic domain walls in fine wires.
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.
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai, Japan.
authors.forename: S E
authors.initials: SE
authors.lastname: Barnes
authors.forename: S
authors.initials: S
authors.lastname: Maekawa