Magnetothermopower and magnon-assisted transport in ferromagnetic tunnel junctions

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

References in corpus (1)

• Subgap transport in ferromagnet-superconductor junctions due to magnon-assisted Andreev reflection

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• Tunnel magneto-Seebeck effect
• Magnon-assisted transport and thermopower in ferromagnet-normal metal tunnel junctions