title: Direct observation of domain-wall configurations transformed by spin currents.
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 submicrometer Fe20Ni80 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.
authors.affiliation: Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, D-78457 Konstanz, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Kläui
authors.forename: P-O
authors.initials: PO
authors.lastname: Jubert
authors.forename: R
authors.initials: R
authors.lastname: Allenspach
authors.forename: A
authors.initials: A
authors.lastname: Bischof
authors.forename: J A C
authors.initials: JA
authors.lastname: Bland
authors.forename: G
authors.initials: G
authors.lastname: Faini
authors.forename: U
authors.initials: U
authors.lastname: Rüdiger
authors.forename: C A F
authors.initials: CA
authors.lastname: Vaz
authors.forename: L
authors.initials: L
authors.lastname: Vila
authors.forename: C
authors.initials: C
authors.lastname: Vouille