Abstract
Magnon-assisted transport across a tunnel junction between a ferromagnet and a normal (nonmagnetic) metal is studied theoretically. A finite temperature difference across the junction produces a nonequilibrium magnetization that drives a charge current, mediated by electrons via electron-magnon interactions, from the ferromagnet into the normal metal. The corresponding thermopower coefficient is large, where represents the degree of spin polarization of the current response to a bias voltage, and depends on the relative sizes of the majority and the minority band Fermi surface in the ferromagnet and in the normal metal,
- Received 3 March 2003
DOI:https://doi.org/10.1103/PhysRevB.68.172404
©2003 American Physical Society