Abstract
Activation volume and inter-particle in interaction were evaluated using superfine Ba-ferrite-particle-coated media, which were either oriented or non-oriented. It was clarified the peak value of the ΔM plot, which was used for evaluation of inter-particle interaction, changes according to the degree of media orientation. The activation volumes of superfine particulate media were found to be twice as large as their physical volumes. This suggested that more than two particles are stacked and act together in magnetization reversal. The effective value of KuVac/kT was also estimated. For media composed of superfine Ba ferrite particles with diameters of about 22 nm, the KuVac/kT values were close to the critical value in thermal stability.
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