Microstructure and properties of laser interference crystallized amorphous FeSiB ribbon

Abstract

The influence of Q-switched pulsed Nd:YAG laser interference heating, using 120 mJ of pulse energy and a variable number of consecutive pulses, on the microstructure and magnetic properties of amorphous Fe80Si11B9 alloy was examined. Microstructural analysis, using light, scanning and transmission electron microscopy, was complemented by results of Mössbauer spectroscopy and measurement of magnetic properties (vibrating sample magnetometer). Periodically distributed crystallized micro-areas, ∼10 μm in diameter, in an amorphous matrix were produced by the treatments. Magnetization measurements showed that the as-cast ribbon and laser light irradiated samples are magnetically soft materials. The results lead to the conclusion that the dots corresponding to the laser modified regions exhibit a perpendicular magnetic anisotropy.

Magnetic Properties of Interference Pulsed Laser Heated Fe-Based Amorphous Ribbons

“…The best magnetic properties are for alloys that are not strictly amorphous, but with nanometric grain size, since increased of their sizes further increases coercivity. Therefore, it is necessary to produce nanocrystalline alloys [5] and accordingly many unconventional techniques are investigated to obtain nanocrystalline structure out of amorphous alloys [6][7][8][9][10][11].…”

“…It is a fast-developing field of investigations with applications in many technological areas [12][13][14]. Our previous investigation (only for FeSiB ribbons) showed that this technique creates periodically placed laser heated dots, in which structure and magnetic properties changes occur [10,11].…”