Evidence for a magnetic permeability relaxation of dissipative type in amorphous ferromagnetic alloys

Allia, P.; Beatrice, C.; Mazzetti, P.; Vinai, F.
July 1987
Applied Physics Letters;7/13/1987, Vol. 51 Issue 2, p142
Academic Journal
A strong relaxation of the magnetic permeability is observed in amorphous ferromagnetic alloys when times shorter than 10-3 s after impulsive sample demagnetization are explored. This effect is not related to an activated ordering process. It is shown that the motion of domain walls is dominated, at the measuring frequency, by dissipative effects. As a consequence, the fast relaxation of the magnetic permeability is related to a change with time of the power dissipated by the system, rather than to a change of the restoring force acting on the walls, responsible instead for the conventional permeability aftereffect. A mechanism for the power dissipation change is proposed.


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