Spin-wave alternating periodic-chaotic dynamics

A description is given of pulsed ferromagnetic subsidiary resonance experim ents in a YIG sphere at room temperature. Beyond the Suhl instability thres hold. evidences were found for the elusive alternating periodic-chaotic seq uence. The spin-wave self-oscillations have recently been characterized thr ough one-dimensional return maps. Here it is shown that the observed scenar io is also in good qualitative agreement with results from numerical simula tions with a standard two-mode microscopic model. (C) 2001 Elsevier Science B.V. All rights reserved.