Correlation between laser energetic parameters and magnetic properties of GO laminations under surface treatments with long, short or ultra-short pulsed lasers

•Effect of surface laser treatment on the magnetic properties of GO laminations.•Investigating different types of laser treatments: irradiation, scribing and ablation.•Power loss reduction and apparent permeability improvement under a laser scribing with short pulse.•Induced thermal stress, heat-affected zone and groove depth as a function of laser energetic parameters.•A dynamic magnetic hysteresis model (lambda model) related to the dynamic loss and the apparent permeability.