Phase diagram for vortex dynamics

Phase diagram of magnetic vortex dynamics.
T. Y. Chen, A. T. Galkiewicz, and P. A. Crowell
Phys. Rev. B 85, 180406 (2012)

Gyrotropic response as a function of excitation amplitude and frequency for (a) experiment and (b) numerical calculations. The experimental parameter space is above the horizontal dashed line in (b). The color scale is logarithmic. The contours are shown for increasing amplitude. The dashed curve in (b) shows the lower boundary of the region in which two gyrotropic
orbits exist.