Magnon-assisted transport and thermopower in ferromagnet-normal-metal tunnel junctions

Edward McCann, Vladimir I. Fal'ko

    Research output: Contribution to journalArticlepeer-review

    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, S∼ - (kB/e) ×(kBT/ω M)3/2P(∏+,∏-,∏ N) where P(∏+,∏-,∏N), 0≤P≤1, 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, ∏N.

    Original languageEnglish
    Article number172404
    Pages (from-to)1724041-1724044
    Number of pages4
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume68
    Issue number17
    Publication statusPublished - Nov 2003

    Research Beacons, Institutes and Platforms

    • National Graphene Institute

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