Abstract
An explicit relation is established between the reversible relaxation of the ac magnetic permeability and the viscosity field of a ferromagnetic material, which is a measure of the progressive damping experienced by oscillating domain walls after an initial domain-wall re-arrangement. The present relation, obtained under very general conditions, allows one to correctly treat the case of amorphous ferromagnets, where the existence of strong viscosity fields is usually ascribed to processes of directional ordering distributed in activation energy. The time behaviour of the viscosity field of two Fe-based amorphous alloys (Fe 81B 13.5Si 3.5C 2 and Fe 40Ni 40B 20) is obtained through a kinetic analysis of room-temperature data of the magnetic permeability relaxation at constant applied field. The activation-energy spectrum of both alloys is obtained by making use of Primak's treatment of processes distributed in activation energy.
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