Magnetic properties of interference pulsed laser heated Fe-based amorphous ribbons

Abstract

The influence of pulsed laser interference heating on structure and magnetic properties of Fe-based (FeSiB) amorphous ribbons is reported. This form of heating results in periodically placed laser heated micro-areas. In these, changes in microstructure and magnetic properties occur and the results are compared with those for samples after conventional annealing at 600 ◦C. Electron microscopy showed that the laser beam energy causes partial crystallization of the amorphous material, which affects magnetic properties. Magnetic hysteresis loop measured by SQUID magnetometer showed that saturation magnetization σ lowered after both treatment (i.e., conventional annealing and laser heating) in comparison to amorphous ribbons (where the range of σ was from 155 to 185 emu/g), except for FeCuSiB alloy after laser heating. Magnetic structure of all the samples was also observed by magnetic force microscopy. While no signal was detected in the as-received amorphous ribbons, conventional annealing and laser heating resulted in strong magnetic signals.