Fluctuation effects on the magnetization dynamics below the Curie temperature of ferro- and ferrimagnets

Measurements of the linear dynamic susceptibility between 1 Hz and 20 GHz are reported for strongly uniaxial and weakly anisotropic cubic model magnets. Approaching T/sub c/ from below, the contributions of the homogeneous magnetization and the wall motion have been separated. The most significant effects of critical magnetization fluctuations occur in the wall mobility of uniaxial materials near the disordering temperature of the Bloch-walls, T*>