Abstract
From measurements of the time dependence of the magnetization, the thermal activation volume in various materials for recording media was deduced and its relationship with the magnetization reversal mode studied. With this aim, the materials were analysed in different conditions which can affect the basic processes of magnetization. The activation volume results depending on the magnetization switching mode. In particles with good morphological and structural order the activation volume approaches the physical volume of the particles. On the contrary, when different conditions pertain, e.g. imperfect morphology, addition of doping ions, effects of interparticle interactions and temperature, make more probable the occurrence of an incoherent, or heterogeneous, switching, the activation volume is relatively smaller. It indicates a direct relation of the activation volume with the region of material acting as center of nucleation of the reversal.
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