Abstract
We report a theoretical study of the influence of the Coulomb interaction on theequilibrium spin current in a quantum-dot spin valve, in which the quantum dot describedby the Anderson impurity model is coupled to two ferromagnetic leads with noncollinearmagnetizations. In the Kondo regime, electrons transmit through the quantum dot viahigher-order virtual processes, in which the spin of either lead electrons or a localizedelectron on the quantum dot may reverse. It is found that the magnitude of the spincurrent decreases with increasing Coulomb interactions due to spin flip effects on thedot. However, the spatial direction of the spin current remains unchanged; it isdetermined only by the exchange coupling between two noncollinear magnetizations.
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