Structural relaxation and crystallisation processes in FeCu1XSi13B9 (X = Mo, Cr, Zr) amorphous alloys

The main aim of the paper was to study the influence of 1h annealing (temperature range 300 < T-a < 850 K) on magnetisation processes, the intensity of magnetic after-effect Delta mu/mu (T-a) and magnetic permeability mu(T-a) determined at room temperature. The observed dependence of Delta mu/mu (T-a) is in agreement with models proposed by Allia- Vinai and Kronmuller and can be related to processes of coagulation and disappearance of microvoids (the intensity of magnetic after-effect is proportional to the amount of microvoids). It has been shown that for the amorphous alloys of type FeCu1XSi13B9 (X = Mo, Cr, Zr) magnetic properties can be optimised by applying the well-defined thermal treatment causing a formation of nanocrystalline phase. (C) 2000 Elsevier Science B.V. All rights reserved.