Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 33: Poster II

MA 33.64: Poster

Freitag, 26. März 2010, 11:00–14:00, Poster B1

Inductive Detection of Magnetic Vortex Gyration in Permalloy Squares — •Hauke Hendrik Langner, Lars Bocklage, Toru Matsuyama, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg, Germany

In micrometer-sized thin permalloy squares with a Landau-domain pattern a vortex core points out of the plane with two possible polarizations. High frequency fields or currents applied to the permalloy square excite the vortex to gyrate around the center. We propose a procedure to detect the gyration frequency and phase in such permalloy squares. A rectangular induction loop is deposited above the permalloy square so that the changes of the stray field of the gyrating vortex induce a periodic voltage. We expect an alternating voltage close to the resonance frequency of the vortex.

The method provides the possibility to detect magnetization dynamics of single microstructures.