An atomic model previously proposed by Kronmuller to explain the reversible magnetic after-effect in ferromagnetic amorphous alloys has been extended following the ideas of the coupling scheme for treating relaxation processes in complex systems. In the extended model the elementary atomic mechanism for the relaxation is assumed to be the activated rearrangements of atom pairs proposed by Kronmuller. Correlations among the relaxing units are introduced through the coupling ideas. Due to the inherent randomness of the amorphous metallic alloys, a distribution of the relaxation times corresponding to the elementary processes is also considered