Spatio-Temporal Stochastic Resonance of Domain Walls in Inhomogeneous Magnets

. We study the motion of a small-angle domain wall (DW) in a rhombic ferromagnet with localized attracting inhomogeneities in the vicinity of the reorientational phase transiton induced by temperature. Usually a DW can be trapped by the inhomogeneities. If the system is additionally driven by a noisy magnetic field the DW is able to perform stochastic motion and hence achieves probability to jump between several attracting inhomogeneities. With a small periodic field applied to the system we will observe stochastic resonance in the motion of the DW. At an optimal noise level the hopping dynamics of the DW become most coherent and the response of the system to the periodic force is maximal. 1. Introduction In the last decade the phenomenon of stochastic resonance (SR) has attracted much attention. This phenomenon underlies a "positive", constructive role which noise might play in nonlinear systems: with an increase of noise applied to a nonlinear system a response of the system to a s..