THE INFLUENCE OF LASER RADIATION ON MAGNETIC PROPERTIES OF METALS

The problem of reducing power losses in electrical plates of Fe-Si, the strict current world is very complex, requiring a thorough knowledge of material structure and linked to it, the configuration of magnetic fields that is structured. This work aims at highlighting the influence laser radiation has on hysteresis losses in Fe-Si sheet plates, and the explanation of differences between the irradiated and non-irradiated sheets. Comparative measurements were carried out between two identical sheets, 300x30x0,5mm, for frequency and induction of magnetic field between 10Hz and 1000Hz, respectively between 100mT and 2100mT. It was noted in both sheets an increase of frequency of active power and apparent power consumption and coercive field intensity and for a fixed frequency was an increase of hysteresis curve area of irradiated sheets. Qualitative and quantitative interpretation of these results was done taking into account the microscopic structure of ferromagnetic materials (sheets of Fe-Si), in the sense that laser radiation increases the degree of fragmentation of Weiss domains, so the number of Bloch walls separating these areas and, also, the number of atoms (magnetic dipoles) inside these walls.