Magnetic vortex core dynamics in cylindrical ferromagnetic dots

  • Guslienko K
  • Han X
  • Keavney D
 et al. 
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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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  • K. Yu Guslienko

  • X. F. Han

  • D. J. Keavney

  • R. Divan

  • S. D. Bader

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