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DY: Dynamik und Statistische Physik

DY 24: Nonlinear stochastic systems

DY 24.4: Vortrag

Dienstag, 25. März 2003, 15:30–15:45, G\"OR/226

Stochastic Resonance and Ferroelectric Domain Switching — •Martin Diestelhorst and Konstantin Drozhdin — Martin-Luther-Universtät Halle-Wittenberg, Fachbereich Physik, Friedemann-Bach-Platz 6, 06108 Halle

Triglycine sulfate (TGS) is the first ferroelectric material that has been reported to exhibit the effect of stochastic resonance. We observed the effect experimentally, varying the noise strength added to a periodic signal, that was too weak to cause switching between the two possible states of polarization in ferroelectric TGS. Despite the fact that most of the theoretical predictions could be confirmed in our experiments, there occured some peculiarities that have not been observed in other systems with stochastic resonance. The most obvious effect is the dependence of the spectral amplification and the signal- to-noise-ratio on the direction of noise variation. It can be explained taking into account the mechanism of domain switching in ferroelectric materials. For this reason the averaged No-dqhysteresis loopNo-dq of the ferroelectric at stochastic resonance is investigated.