Physical Review Letters · 2005 · 266 citations · 13 references
Natural SciencesPhysicsCondensed Matter PhysicsElectromagnetismMagnetic MaterialsDomain WallsFerromagnetismMagnetic DomainsMagnetic Properties Of SolidsMagnetism In SolidsSpintronicsConductionDomain Wall MotionDomain Wall PinningFerromagnetic Domain WallsMagnetic Domain WallsSpin CouplingTranslational SymmetryTranslational Symmetry Breaking
The study examines how electric current couples to ferromagnetic domain walls. The dynamics are modeled using modified Landau–Lifshitz–Gilbert equations. The analysis shows that a finite current transfers angular momentum perfectly to the wall, driving it into uniform motion that persists with relaxation, and the theoretical predictions for a simple pinning model agree with experiment.
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.
13
Electric-field control of ferromagnetism
Hideo Ohno, Daichi Chiba, F. Matsukura et al. · Nature · 2000 · 2K citations