Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.83: Poster

Freitag, 27. März 2009, 11:00–14:00, P1A

Observation of reversible current-induced vortex core displacements in magnetic disks — •Lutz Heyne, Jan Rhensius, Dennis Ilgaz, Mathias Kläui, and Ulrich Rüdiger — Universität Konstanz, Germany

The understanding of the interplay between spin-polarized currents and the magnetization is of high scientific interest and many proposed applications relay on the ability of controlled manipulation of the magnetization by currents. Here especially the influence of the so called non-adiabatic contribution on the interaction is to the present point poorly understood. Vortex cores exhibit large magnetization gradients and it has been predicted that the non-adiabatic contribution will be large in these systems. Thus their study can reveal important information concerning the non-adiabatic term.

We present new results on the interaction between injected current and magnetic vortex cores. Moreover we calculate the vortec core response theoretically as well as numerically to compare with the experimental results.

With direct imaging using X-ray photo emission electron microscopy we directly measure the current-induced vortex core displacement as a function of the current density. The results allow us to estimate the influence of the non-adiabatic term to the magnetization dynamics.