Abstract
Department of Physics, University of Houston, Houston, Texas(Dated: November 5, 2009)Magnetization reversal is a well-studied problem with obvious applicability in computer hard-drives. One can accomplish a magnetization reversal in at least one of two ways: applicationof a magnetic field, or through a spin current. The latter is more amenable to a fully quantummechanical analysis. We formulate and solve the problem whereby a spin current interacts with aferromagnetic Heisenberg spin chain, to eventually reverse the magnetization of the chain. Spin-flips are accomplished through both elastic and inelastic scattering. A consequence of the inelasticscattering channel, when it is no longer energetically possible, is the occurrence of a new entity:a non-equilibrium bound state (NEBS), which is an emergent property of the coupled local plusitinerant spin system. For certain definite parameter values the itinerant spin lingers near the localspins for some time, before eventually leaking out as an outwardly diffusing state. This phenomenonresults in novel spin-flip dynamics and filtering properties for this type of system.INTRODUCTION
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