Abstract
Pulsed excimer laser (248 nm, 8 ns) irradiation of Fe77Cr2B16Si5 metallic glass produces an out-of-plane reorientation of magnetic moment directions as well as changes in the resonant area of the Mössbauer spectra which depend on the irradiation time. Scanning electron microscopy (SEM) determinations linked these changes to the occurrence of molten zones subsequently resolidified. For comparison, Mössbauer spectra of the Fe/Cr18/Ni8/Ti magnetic steel showed additional features in the probability distribution of the hyperfine magnetic field, while the distribution of the Fe/Cr18/Ni8/Mo3 nonmagnetic steel remained unchanged after laser processing. For both steels, the distribution area in the Mössbauer spectra was found to decrease steadily as a function of irradiation time and the magnetic hyperfine fields showed maxima after 10 s/spot. SEM/EDX examination of the laser irradiated areas demonstrated that Ti atoms are displaced from these zones and suggest atomic rearrangements related to the features observed in the distributions of probability.
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