Magnetothermopower and magnon-assisted transport in ferromagnetic tunnel junctions
arXiv:cond-mat/0202475 · doi:10.1063/1.1519730
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, $S_{AP} \sim - (k_B/e)$, in contrast to $S_{P} \approx 0$ for a parallel configuration.
3 pages, 1 eps figure