Effect of laser scribing on the magnetic properties and domain structure of high‐permeability 3% Si‐Fe
| Autor: | R. A. Miller, Gary C. Rauch, Robert F. Krause, W. H. Kasner |
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| Rok vydání: | 1984 |
| Předmět: | |
| Zdroj: | Journal of Applied Physics. 55:2121-2123 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.333583 |
| Popis: | Localized laser heating was used to alter the magnetic characteristics and domain size of high‐permeability grain‐oriented silicon steel. A continuous‐wave CO2 laser was used to scribe narrow transverse stripes on fully processed, Forsterite‐coated strip. The laser power was maintained at 32 W, and the power density applied to the strip was controlled by varying the scan speed. The spacing of the scribe lines was varied between 3 and 13 mm. A decrease in core loss was observed at a scan speed of 169 mm/s and a scribe spacing of 6 mm. Losses decreased 9% at 1.7 T and 18% at 1.0 T. A maze domain structure, indicative of a compressive stress, was observed in the laser‐affected regions. The average 180° domain size was reduced by scribing; as the scan speed was reduced and the scribe spacing decreased, the domain size decreased. Although the Forsterite coating was not visibly damaged by the laser heating, polishing and etching of the steel substrate revealed localized slip lines in the laser‐affected zones. The hysteresis loss component was increased by laser scribing, and thus we attribute the observed loss reduction to a decrease in the eddy current loss component caused by the decrease in domain wall spacing. |
| Databáze: | OpenAIRE |
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