Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

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 Backes^1,2, 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.