The evolution of magnetic properties of Fe73.5Cu1Nb3Si13.5B9 microwires during the devitrification process

Abstract The evolution of some magnetic properties (initial susceptibility, saturation magnetization, hysteresis loop) of Fe 73.5 Cu 1 Nb 3 Si 13.5 B 9 microwires during the devitrification stages ( T a =450°C, 500°C, 550°C, 600°C and 650°C) is studied. The temperature dependence of the initial susceptibility shows a rapid increase above 300°C for the treatment below 500°C, when the sample is in amorphous state. After crystallization, a strong hardening is observed. The temperature dependencies of the saturation magnetization show the appearance of new nanocrystalline phases after different devitrification stages. The X-ray diffraction is used to verify the crystallization process.