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. © 2006 The American Physical Society.
CITATION STYLE
Guslienko, K. Y., Han, X. F., Keavney, D. J., Divan, R., & Bader, S. D. (2006). Magnetic vortex core dynamics in cylindrical ferromagnetic dots. Physical Review Letters, 96(6). https://doi.org/10.1103/PhysRevLett.96.067205
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