Magnetothermopower and magnon-assisted transport in ferromagnetic tunnel junctions
Edward McCann, Vladimir I. Fal'ko
Abstract
We present a model of the thermopower in a mesoscopic tunnel junction between two ferromagnetic metals based upon magnon-assisted tunneling processes. In our model, the thermopower is generated in the course of thermal equilibration between two baths of magnons, mediated by electrons. We predict a particularly large thermopower effect in the case of a junction between two half-metallic ferromagnets with antiparallel polarizations, SAP - (kB/e), in contrast to SP ≈ 0 for a parallel configuration.
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