Regensburg 2010 – scientific programme

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.66: Poster

Friday, March 26, 2010, 11:00–14:00, Poster B1

Spin-wave eigenmodes in small magnetic disks in the vortex state — •Björn Obry, Katrin Vogt, Helmut Schultheiss, Philipp Pirro, and Burkard Hillebrands — FB Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern

We study the eigenmode spectrum of small magnetic permalloy disks with their magnetization in the vortex state. Brillouin light scattering microscopy experiments yield different spin-wave eigenmode spectra, depending on the excitation geometry and the disk size. By means of an oscillating out-of-plane magnetic field only radial standing spin-wave modes can be excited directly. Furthermore it is observed that mode coupling induces an indirect excitation of some azimuthal eigenmodes, the latter being expected for an in-plane excitation only.

Sample preparation by the Nano+Bio Center of the Technische Universität Kaiserslautern and financial support by the Graduiertenkolleg 792 is gratefully acknowledged.