Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Spindependent Transportphenomena II
MA 11.1: Vortrag
Montag, 25. Februar 2008, 15:15–15:30, H 0112
Current-induced domain wall motion and vortex core displacements — •Lutz Heyne1, Dirk Backes1,2, Stephen Krzyk1, Mathias Kläui1, Ulrich Rüdiger1, Laura Heyderman2, Arantxa Fraile-Rodriguez2, Frithjof Nolting2, Miguel Nino3, Tevfik Mentes3, Andrea Locatelli3, Konstantin Kirsch4, and Roland Mattheis4 — 1Universität Konstanz, 78457 Konstanz, Germany — 2Paul Scherrer Institut, 5232 Villigen, Switzerland — 3Sincrotrone Trieste, 34012 Trieste, Italy — 4Institute of Photonic Technology, 07702 Jena, Germany
The feasibility of the manipulation of magnetic domains by spin-polarized current injection is of great scientific interest and has large potential for applications. Theoretically the influence of the current is described by an adiabatic and a non-adiabatic term added to the Landau-Lifshitz-Gilbert equation of motion. Here especially the magnitude of the non-adiabatic term is currently much under debate.
We present new results on current induced domain wall motion. Direct X-ray photoemission electron microscopy imaging has been used to probe the magnetization configuration. In Permalloy wires we observe spin-torque induced domain wall transformations from vortex walls to transverse walls and vice versa. These transformations agree with predictions made by theory for the non-adiabatic term mentioned above. Furthermore we observe current induced vortex core displacements in magnetic disks. It is shown that the direction of the displacement depends on the vortex core polarity, i.e. the direction of the out-of-plane vortex core magnetization component.