Enhanced dc spin pumping into a fluctuating ferromagnet near TC

Yuichi Ohnuma, Hiroto Adachi, Eiji Saitoh, Sadamichi Maekawa

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    66 Citations (Scopus)

    Abstract

    A linear-response formulation of the dc spin pumping, i.e., a spin injection from a precessing ferromagnet into an adjacent spin sink, is developed in view of describing many-body effects caused by spin fluctuations in the spin sink. It is shown that when an itinerant ferromagnet near TC is used as the spin sink, the spin pumping is largely increased owing to the fluctuation enhancement of the spin conductance across the precessing ferromagnet/spin sink interface. As an example, the enhanced spin pumping from yttrium iron garnet into nickel palladium alloy (TC≃20 K) is analyzed by means of a self-consistent renormalization scheme, and it is predicted that the enhancement can be as large as tenfold.

    Original languageEnglish
    Article number174417
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume89
    Issue number17
    DOIs
    Publication statusPublished - May 15 2014

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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