The stray-field structure of a HI-B sheet in the vicinity of laser scratches

Abstract

The stray-field behaviour of laser scratches which are burned into the surface of HI-B sheets in order to reduce the domain-spacing and thus the anomalous eddy-current loss has been measured. The influence of the external applied field on the stray-field structure is shown and one possible mechanism for the observed loss reduction is favoured. Besides the influence of the charges at the laser scratches on the magnetization reversal of the single sheet the possibility of an interaction between several stacked sheets due to the stray field at laser scratches is discussed.