Nonadiabatic spin torque investigated using thermally activated magnetic domain wall dynamics.
作者： M. Eltschka , M. Wötzel , J. Rhensius , S. Krzyk , U. Nowak
DOI: 10.1103/PHYSREVLETT.105.056601
关键词: Quasiparticle 、 Nanowire 、 Spin (physics) 、 Permalloy 、 Materials science 、 Arrhenius equation 、 Magnetic domain 、 Vortex 、 Condensed matter physics 、 Magnetization
摘要: 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 is well described by an Arrhenius law, allowing for a description DW as quasiparticle one-dimensional potential landscape. By injecting small currents, modified, determination nonadiabatic spin torque: beta(t) = 0.010 +/- 0.004 transverse and beta(v) 0.073 0.026 vortex DW. The larger value attributed to higher magnetization gradients present.
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