Magnetic vortex core dynamics in cylindrical ferromagnetic dots |
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Authors: | Guslienko K Yu Han X F Keavney D J Divan R Bader S D |
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Institution: | Materials Science Division and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA. gusliyenko@anl.gov |
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Abstract: | We report direct imaging by means of x-ray photoemission electron microscopy of the dynamics of magnetic vortices confined in micron-sized circular permalloy dots that are 30 nm thick. The vortex core positions oscillate on a 10 ns time scale in a self-induced magnetostatic potential well after the in-plane magnetic field is turned off. The measured oscillation frequencies as a function of the aspect ratio of the dots are in agreement with theoretical calculations presented for the same geometry. |
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