Abstract
The power loss of grain oriented electrical steel can be usefully reduced by refinement of the ferromagnetic domain structure in cases where overlarge grains support widely spaced domains. Artificial grain boundaries can be produced by laying down lines of ablated spots on the steel surface to generate a stress and atomic disruption pattern which pins domain walls and leads to a smaller wall spacing. A high voltage electrical discharge from capacitors or otherwise can be used to give high enough energy rates and spatial densities to achieve suitably ablated spots on the metal surface. The method is readily adaptable to a production situation.
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