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Direct observation of domain-wall configurations transformed by spin currents

M. Klaui·P. -O. Jubert·R. Allenspach·A. Bischof·J. A. C. Bland·G. Faini·U. Rudiger·C. A. F. Vaz·L. Vila·C. Vouille
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Abstract

Direct observations of current-induced domain-wall propagation by spin-polarized scanning electron microscopy are reported. Current pulses move head-to-head as well as tail-to-tail walls in sub-micrometer Fe_{20}Ni_{80} wires in the direction of the electron flow, and a decay of the wall velocity with the number of injected current pulses is observed. High-resolution images of the domain walls reveal that the wall spin structure is transformed from a vortex to a transverse configuration with subsequent pulse injections. The change in spin structure is directly correlated with the decay of the velocity.

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M. Klaui, P. -O. Jubert, R. Allenspach, A. Bischof, J. A. C. Bland, G. Faini, U. Rudiger, C. A. F. Vaz, L. Vila, C. Vouille. 2005-07-11. Direct observation of domain-wall configurations transformed by spin currents. https://doi.org/10.1103/physrevlett.95.026601

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