Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9834089 | Journal of Magnetism and Magnetic Materials | 2005 | 5 Pages |
Abstract
Surface defects were produced onto commercial grain oriented iron silicon steel coated with forsterite by laser scribing and by chemical etching. Laser intensity was varied from 1 to 10 kW/cm2 and also the defect raster was varied. Dynamic hysteresis loops of unscribed and scribed electrical steel sheets have been measured in the range of 0.05-500 Hz using Epstein frames and a computer-controlled hysteresis recorder. From dynamic hysteresis loops the dynamic and static power losses were separated. In addition to the well-known reduction of dynamical losses also a reduction of the static hysteresis losses up to 5% due to the surface treatment was found when low laser intensities were used. It is assumed that this is due to a higher mobility of new 180° domain walls created by the surface treatment. The higher number of mobile Bloch walls in the electrical steel sheets lead to the reduction of static losses, too.
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Physical Sciences and Engineering
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Condensed Matter Physics
Authors
B. Weidenfeller, W. Riehemann,