Direct observation of spin-torque driven magnetization reversal through nonuniform modes

We present time-resolved x-ray images with 30 nm spatial and 70 ps temporal resolution, which reveal details of the spatially resolved magnetization evolution in nanoscale samples of various dimensions during reversible spin-torque switching processes. Our data in conjunction with micromagnetic simu...

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Veröffentlicht in:Physical review letters 2008-06, Vol.100 (24), p.247201-247201, Article 247201
Hauptverfasser: Strachan, J P, Chembrolu, V, Acremann, Y, Yu, X W, Tulapurkar, A A, Tyliszczak, T, Katine, J A, Carey, M J, Scheinfein, M R, Siegmann, H C, Stöhr, J
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Sprache:eng
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Zusammenfassung:We present time-resolved x-ray images with 30 nm spatial and 70 ps temporal resolution, which reveal details of the spatially resolved magnetization evolution in nanoscale samples of various dimensions during reversible spin-torque switching processes. Our data in conjunction with micromagnetic simulations suggest a simple unified picture of magnetic switching based on the motion of a magnetic vortex. With decreasing size of the magnetic element the path of the vortex core moves from inside to outside of the nanoelement, and the switching process evolves from a curled nonuniform to an increasingly uniform mode.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.100.247201