Theory of magnetic after-effects in ferromagnetic amorphous alloys

The magnetic after-effect spectrum of amorphous alloys is attributed to rearrangements of defect structures which are described by two-level systems. Using first-order reaction kinetics, the so-called stabilization potential of domain walls is determined for both ‘reversible’ and ‘irreversible’ after-effects. It is shown that by an appropriate averaging over the energy gap parameters and the activation energies, the relaxation phenomena in amorphous alloys can be described explicitly.