Flash stress annealings in nanocrystalline alloys for new inductive components

Abstract This paper deals with the analysis of both crystallization (by XRD) and losses in stress-flash-annealed Finemet-type nanocrystalline alloys. The results shows the efficiency of a new heating technique to obtain magnetic cores (μ∼200–300 over ΔB=1.2 T, P 0.1T/25 kHz 3 , no airgap, good thermal behaviour). They were well adapted for applications such as flyback transformers, special current probes, inductances for resonant DC/AC converters. The originality comes from the ability to adjust the desired permeability by inducing strong transversal anisotropy (few thousands J/m 3 , two orders higher than in field annealing) by mechanical tensile stress and to produce directly wound cores.