Direct observation of domain-wall configurations transformed by spin currents

Details Direct observation of domain-wall configurations transformed by spin currents Direct observation of domain-wall configurations transformed by spin currents

2005-04-18

arxiv.org/abs/cond-mat/0504427v2

Phys. Rev. Lett. 95, 026601 (2005)

Physics

Condensed Matter

Other Condensed Matter

5 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.95.026601

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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