Opposite spin asymmetry of elastic and inelastic scattering of nonequilibrium holes injected into a ferromagnet

B.G. Park, T. Banerjee, J.C. Lodder, R. Jansen

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    Abstract

    The spin asymmetry of elastic and inelastic scattering of nonequilibrium holes injected into Co thin films is examined using a p-type magnetic tunnel transistor. Spin-dependent transmission yields a positive or negative magnetocurrent depending on Co thickness and hole energy. Up to a critical thickness of about 3 nm, (quasi)elastic scattering dominates with a short attenuation length (<1 nm) and preferential attenuation of holes in the majority spin bands, consistent with spin-wave emission. At a larger Co thickness, inelastic scattering dominates with a larger attenuation length (~4 nm) and opposite spin asymmetry.
    Original languageUndefined
    Pages (from-to)137205
    Number of pages4
    JournalPhysical review letters
    Volume97
    Issue number1636734 (P
    DOIs
    Publication statusPublished - 28 Sep 2006

    Keywords

    • EWI-9211
    • IR-59074
    • METIS-237956

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