Surface ablation of the GO FeSi Electrical Single Sheet: Impact on the Static/ Dynamic Magneto-Mechanical Behavior and Optimization

International audience ; Ultra-Short Pulsed Laser Ablation process performed on the surface of a Grain-Oriented Electrical Steel (GOES) has shown a significant decrease in the iron losses up to 20%. This is due to a modification of the domain structure that is re-organized using a total energy minimization. Therefore, this leads to a change in the permeability and in the magneto-mechanical behavior also known as the magnetostriction. These modifications are respectively due to the modification of the magnetostatic and the magnetoelastic energy contributions. In this study, the effect of the ablation on the magnetic and the magneto-mechanical properties is revealed and compared to classical irradiation and scribing processes in the static and the dynamic working conditions. Synchronous real time magnetic and mechanical measurements are performed using a dedicated test bench: the Single Sheet Tester with a mechanical adaptation using a fixed-free sample with a piezoelectric accelerometer. GOES samples are measured and compared before and after treatment for different optimal laser parameters. Results have shown that different performances can be simultaneously obtained:- Magnetostriction reduction up to 50%- Permeability increase at low induction up to 20%Physical origins of the change in both static and dynamic magneto-mechanical properties due a laser process will be discussed and proposed to orientate the optimization of laser process parameters towards the best compromise between iron loss reduction, permeability increase and magnetic induced vibrations.