Nonadiabatic Spin Torque Investigated Using Thermally Activated Magnetic Domain Wall Dynamics

M. Eltschka, Mathias Woetzel, J. Rhensius, S. Krzyk, U. Nowak, M. Kläui, Takeshi Kasama, Rafal E. Dunin-Borkowski

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    Abstract

    Using transmission electron microscopy, we investigate the thermally activated motion of domain walls (DWs) between two positions in Permalloy (Ni80Fe20) nanowires at room temperature. We show that this purely thermal motion is well described by an Arrhenius law, allowing for a description of the DW as a quasiparticle in a one-dimensional potential landscape. By injecting small currents, the potential is modified, allowing for the determination of the nonadiabatic spin torque: βt=0.010±0.004 for a transverse DW and βv=0.073±0.026 for a vortex DW. The larger value is attributed to the higher magnetization gradients present.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume105
    Issue number5
    Pages (from-to)056601
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2010

    Bibliographical note

    Copyright 2010 American Physical Society

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