Influence of continuous laser annealing on magnetic properties of amorphous ribbons: Connections with structural modifications and crystallization occurrence, as revealed by Mössbauer spectroscopy

Abstract

In this paper the influence of continuous laser annealing on the magnetic properties and amorphous structure of Fe 40 Ni 40 P 14 B 6 ribbons is studied; an interpretation is given relating the measured magnetic behaviour with the structural aspects revealed by Mössbauer spectroscopy. The saturation induction, the magnetostriction, the initial permeability, the constant of magnetic anisotropy and the residual stress behaviour versus the annealing temperature are reported. The experimental results show that the continuous laser irradiation can be used to improve magnetic properties under appropriate conditions. In particular the average temperature of heating must not exceed 450 K. On the other hand, we show that the effects of continuous laser annealing are pre-eminently due to both the quenching stress relaxation and the formation of crystalline phases.