Magnetic-domain structure and losses in Goss-textured silicon iron

A strong positive association between power loss in grain-oriented silicon iron and the percentage of the surface exhibiting fine maze-domain structures has been reported by Daniels. This association appears to conflict with domain-wall theories of anomalous loss, which predict higher losses for larger domain sizes. The present paper, which treats the maze- and slab-domain regions as two magnetic phases of different permeability, shows that Daniels´s results can be attributed to the overloading of the higher permeability slab-domain regions, caused by flux bypassing the less permeable maze domains. Thus the losses, though caused by the presence of the maze-domain regions, are actually mainly incurred outside them, and so the conflict with domain-wall theory does not arise.