Improving the energy efficiency characteristics of magnetic metallic glasses through excimer laser treatment Available to Purchase

Metallic glasses have important applications as core materials for transformers and inductors because of their low core losses. In this work, excimer laser annealing was employed to further reduce these core losses and optimize other magnetic properties. A 248-nm, 23 nsec pulsed KrF excimer laser was used to anneal the melt-spun ribbons of Metglas 2605. The process involved pulsed laser irradiation of the material and thereby subjecting it to rapid heating and cooling without reaching its crystallization temperature. The laser beam is also scanned with the aid of a computer controlled X-Y table to cover a larger area of the sample. The process parameters included energy fluence, pulse repetition rate, and scan rate. Results showed that laser annealing reduced the hysteresis loss, differential permeability, remenance but increased coercivity and saturation magnetic induction. The magnetic properties were correlated to the energy fluence and the annealed area coverage.