Simulations of noise-free stochastic resonance in spin-wave chaos

Numerical simulations of noise-free stochastic resonance and aperiodic stoc hastic resonance in chaotic ferromagnetic resonance are presented. The mode l, based on three-magnon interactions between the externally excited unifor m mode and pairs of spin waves, shows on-off intermittency. The rf magnetic field amplitude is slowly modulated by a small periodic or aperiodic signa l, and the output signal, which reflects the occurrence of laminar phases a nd bursts in the time series of spin-wave amplitudes, is analyzed. On varia tion of the de magnetic field the signal-to-noise ratio of the output signa l and the correlation function between modulation and output signal pass a maximum, which indicates the occurrence of periodic and aperiodic stochasti c resonance, respectively. The role of thermal magnon excitations in the oc currence of this maximum is clarified. The results are compared with experi mental findings obtained in other types of intermittency.