Thermal stability up to 400°C of the magnetic properties of Finemet-based nanocrystallized glass-coated microwires

Abstract This paper focuses on the temperature dependence of the magnetic properties of Fe 73.2 Si 15.8 B 6.9 Cu 1.2 Nb 2.9 nanocrystallized glass-coated microwires. An excellent stability of the frequency dependence of the permeability up to 350 °C is observed. A huge effect of the temperature is observed on the static anisotropy obtained by VSM measurements up to 400 °C. The study of the influence of the geometry at 20 °C also evidences differences between dynamic and static magnetic properties. The results concerning the shift of the resonance frequency (F r ) are not consistent with a magneto-elastic approach of the anisotropy in contrast with the evolution of the anisotropy obtained from static measurements.