Quasiperiodicity, bistability, and chaos in the Landau-Lifshitz equation

The dynamics of an individual magnetic moment is studied through the Landau -Lifshitz equation with a periodic driving in the direction perpendicular t o the applied field. For fields lower than the anisotropy field and small v alues of the perturbation amplitude we have observed the magnetic moment bi stability. At intermediate values we have found quasiperiodic bands alterna ting with periodic motion. At even larger values a chaotic regime is found. When the applied field is larger than the anisotropy one, the behavior is periodic with quasiperiodic regions. Those appear periodically in the ampli tude of the oscillating field. Also, even for low values of the driving for ce, the moment is not parallel to the applied field.