Simulations of Noise-Free Stochastic Resonance in Spin-Wave Chaos

A. Krawieckia, E. Reiboldd, H. Bennerd and A. Sukiennickia,b,c a Institute of Physics, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland b Department of Solid State Physics, University of Łódź, Pomorska 149/153, 90-283 Łódź, Poland c Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland d Institut für Festkörperphysik, Technische Universität Darmstadt, Hochschulstraße 6, 64289 Darmstadt, Germany

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Numerical simulations of noise-free stochastic resonance and aperiodic stochastic resonance in chaotic ferromagnetic resonance are presented. The model, based on three-magnon interactions between the externally excited uniform mode and pairs of spin waves, shows on-off intermittency. The rf magnetic field amplitude is slowly modulated by a small periodic or aperiodic signal, and the output signal, which reflects the occurrence of laminar phases and bursts in the time series of spin-wave amplitudes, is analyzed. On variation of the dc magnetic field the signal-to-noise ratio of the output signal and the correlation function between modulation and output signal pass a maximum, which indicates the occurrence of periodic and aperiodic stochastic resonance, respectively. The role of thermal magnon excitations in the occurrence of this maximum is clarified. The results are compared with experimental findings obtained in other types of intermittency.

DOI: 10.12693/APhysPolA.97.975 PACS numbers: 76.50.+g, 75.30.Ds, 05.45.+b, 05.40.+j