# Influence of Pulsed Interference Laser Heating on Crystallisation of Amorphous Fe77Cu1Si13B9 Ribbons

## TL;DR

This study explores how pulsed laser heating affects the crystallisation and magnetic properties of a specific amorphous alloy ribbon.

## Contribution

The paper introduces the novel use of pulsed laser interference heating to create periodic crystallised micro-areas in Fe77Cu1Si13B9 ribbons.

## Key findings

- Pulsed laser heating produced two-dimensional crystallised micro-areas spaced 17 µm apart on the ribbon surface.
- Partial crystallisation led to clusters or single nanocrystallites (α-Fe(Si)) within the amorphous matrix.
- Copper addition inhibited grain growth and altered magnetic field line distribution in crystallised regions.

## Abstract

Amorphous Fe77Cu1Si13B9 ribbons were treated with pulsed laser interference heating (PLIH). The research results will significantly contribute to a better understanding of the impact of PLIH on crystallisation and magnetic properties in precisely defined micro-areas of Fe77Cu1Si13B9 (FeCuSiB) ribbons, which has not yet been described in the literature. It was confirmed here that the use of the laser heating process allowed for the achievement of two-dimensional crystallised micro-areas, periodically distributed (at a distance of 17 µm) on the surface of the amorphous ribbons. The correlation between structural changes (SEM, TEM, HRTEM) and the distribution of magnetic field lines of heated amorphous Fe77Cu1Si13B9 ribbons is presented. Particular attention is paid to structural changes in micro-areas where, by controlling the laser interference heating process, the partial crystallisation of amorphous alloys and the formation of clusters or single nanocrystallites (α-Fe(Si)) embedded in an amorphous matrix occur. The addition of copper to the FeSiB alloy promoted the inhibition of grain growth. Electron holography of micro-areas confirmed shifts in the magnetic field lines in the areas of nanocrystallites, the presence of which in the structure caused the magnetisation of the surrounding amorphous matrix.