Stochastic Resonance in Chaotic SpinWave Dynamics.pdfVIP

Stochastic Resonance in Chaotic Spin–Wave Dynamics ∗ † ‡ Ekkehard Reibold , Wolfram Just , Jens Becker, and Hartmut Benner Institut f¨ur Festk¨orperphysik, Technische Hochschule Darmstadt, Hochschulstraße 6, D–64289 Darmstadt, Germany (January 31, 1997) It was suggested by Anishchenko et al. [7] based on We report the first experimental observation of noise–free the numerical analysis of a simple map, that quite sim stochastic resonance by utilizing the intrinsic chaotic dynam- ilar phenomena can be caused by the internal chaotic ics of the system. To this end we have investigated the effect dynamics instead of an external noise. In that case the of an external periodic modulation on intermittent signals ob- served by high power ferromagnetic resonance in yttrium iron intermittent hopping between different chaotic repellers 7 garnet spheres. Both the signal–to–noise ratio and the resi- in conjunction with an additional periodic forcing can be 9 9 dence time distributions show the characteristic features of used to amplify the periodic signal component in close 1 stochastic resonance. The phenomena can be explained by analogy to conventional stochastic resonance. This math r means of a one–dimensional intermittent map. We present ematical model system motivated us to look for noise– a analytical results as well as computer simulations. free stochastic resonance in re