Abstract
We investigate the switching criteria of magnetic vortices in micron-sized Permalloy squares. The vortices are excited by high frequency magnetic fields. Continuous core reversal is demonstrated for a wide range of frequencies and amplitudes of excitation by ferromagnetic absorption spectroscopy and for selected frequencies and amplitudes with time-resolved scanning x-ray microscopy. The boundary of this switching regime is derived from the Thiele equation when a critical velocity of ${v}_{\mathrm{crit}}\ensuremath{\approx}250\phantom{\rule{0.222222em}{0ex}}{\mathrm{ms}}^{\ensuremath{-}1}$ is considered.
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