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, S AP∼-(kB/e), in contrast to SP≈0 for a parallel configuration.
Research Beacons, Institutes and Platforms
- National Graphene Institute