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Abstract
Stochastic resonance is a phenomenon that occurs in nonlinear systems, whereby a weak periodic input is amplified by an additional noise. We observed stochastic resonance in ferroelectric Triglycine sulfate (TGS). Below the Curie point there exist two domain states which are separated by an energetic barrier. The material is driven by small periodic signals that do not cause switching. There are different ways to prove the occurence of stochastic resonance in a bistable system: (i) The response of the system at the input frequency shows a maximum at a special noise level. (ii) An improvement of the signal-to-noise ratio may be registered. Additionally we observed that in ferroelectric TGS there exists a dependence of the response amplitude on the direction of variation of the noise. Increasing the noise from a very low level yields a lower maximum response than decreasing the noise. This may be caused by pinning of domain walls.