STOCHASTIC RESONANCE IN CHAOTIC SPIN-WAVE DYNAMICS

We report the first experimental observation of noise-free stochastic resonance by utilizing the intrinsic chaotic dynamics of the system. T o this end we have investigated the effect of an external periodic mod ulation on intermittent signals observed by high power ferromagnetic r esonance in yttrium iron garnet spheres. Both the signal-to-noise rati o and the residence time distributions show the characteristic feature s of stochastic resonance. The phenomena can be explained by means of a one-dimensional intermittent map. We present analytical results as w ell as computer simulations.