Influence of laser irradiation on magnetic properties of Co–Fe–Si–B amorphous ribbons

Some results on the study of laser irradiation influence on magnetic macroscopic properties of Co–Fe–Si–B amorphous ribbons are presented in this paper. A pulsed laser, with the wavelength of 1.06×10−6 m, pulse width τ=10×10−6–20×10−6 s and repetition rate of 5 imp/s was used for experiments. Co–Fe–Si–B amorphous ribbons exposed to low laser radiation energies exhibit an increase of the relative magnetic permeability up to 20% of the as-cast sample value due to the stress relaxation phenomena. The increase of the laser radiation energy induces a decrease of the relative magnetic permeability due to the appearance of crystallization phenomena in amorphous material. Pulsed laser irradiation of amorphous ribbons has proven to be a powerful tool for tailoring specific local magnetic properties by selectively inducing localized changes in the material microstructure.