Eddy-current-limited growth of ferromagnetic domains on the surface of square-loop alloy tapes

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Abstract
The expansion of small, initially hemicylindrical domains on the surface of square-loop alloy tapes has been simulated numerically under conditions of (i) constant drive field HA; and (ii) constant flux-reversal rate d phi /dt. The calculations treat each element of domain wall as being individually in dynamic equilibrium under the pressure of the applied and local eddy-current magnetic fields and the domain wall surface tension. Variation of the specific wall energy per unit area gamma with wall orientation is ignored, and the 'coercive field' Hc is also ignored. By expressing the equations of motion in reduced units, it has been possible to condense all constant HA growth sequences onto a single sequence and similarly all constant d phi /dt sequences onto another.