Amorphous ribbon domain refinement by scribing

Domain control has been applied to amorphous metal ribbon by mechanical and laser scribing. Mechanically scribed lines were made using a number 88 tungsten carbide scriber with minimum applied pressure. The scribing interval was varied from 0.6 to 10 mm. Laser scribing was performed by using a well-focused
Q
-switch YAG laser. The laser power level and scribing interval were varied to obtain optimal magnetics properties. Core loss reductions of 20-25 percent were measured for mechanically and laser scribed Metglas 2605S-2 ribbon. A mechanism of domain refinement is suggested.