Abstract
The strong relaxation of the ac magnetic permeability, observed in amorphous ferromagnets at very short times after demagnetization, is studied under different experimental conditions. The behavior of the fast permeability relaxation with temperature, applied stress, and driving field frequency clearly shows that this effect has a predominant dissipative character, very different from the diffusive permeability aftereffect, ascribed instead to activated processes of directional ordering. Optical measurements of domain wall motion at the sample surface suggest that the dissipative relaxation of the permeability is to be ascribed to a progressive reduction in the number of the domain walls participating in the magnetization process.
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