Current-driven defect-unbinding transition in an XY ferromagnet

Aditi Mitra, Andrew J. Millis

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A Keldysh-contour effective field theory is derived for magnetic vortices in the presence of current flow. The effect of adiabatic and nonadiabatic spin-transfer torques on vortex motion is highlighted. Similarities to and differences from the superconducting case are presented and are explained. Current flow across a magnetically ordered state is shown to lead to a defect-unbinding phase transition, which is intrinsically nonequilibrium in the sense of not being driven by a variation in effective temperature. The dependence of the density of vortices on the current density is determined.

    Original languageEnglish (US)
    Article number054458
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume84
    Issue number5
    DOIs
    StatePublished - Aug 16 2011

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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