Stochastic resonance in spin-wave chaos: A simulation

A model for noise-free stochastic resonance in chaotic nonlinear ferromagne tic resonance in coincidence regime is investigated numerically. In the mod el, interactions between the uniform mode and two pairs of parametric spin waves are taken into account. For certain values of the model parameters Po meau-Maneville intermittency and on-off intermittency are observed. The cas e of slow periodic modulation of the rf field amplitude is considered and t he signal analyzed reflects the sequence of laminar phases and bursts. Maxi mum of the signal-to-noise ratio is observed as the constant part of the rf field amplitude is varied in the neighbourhood of the intermittency thresh old. The role of the thermal excitations of spin waves in the occurence of stochastic resonance is clarified. The results are in agreement with the re cent experimental observations of stochastic resonance in spin-wave chaos.