High-temperature soft magnetic behavior of magnetic field annealed Finemet-type nanocrystalline alloys

Abstract

The soft magnetic behaviors at elevated temperatures for magnetic field annealed nanocrystalline Fe73.5Cu1Nb3Si13.5B9, (Fe0.5Co0.5)73.5Cu1Nb3Si13.5B9 and Ni10(Fe0.5Co0.5)63.5Cu1Nb3Si13.5B9 alloys were investigated by the temperature evolution of initial permeability (μi-T curve). The results show that magnetic field annealing gives rise to a persistent increasing μi from room temperature to a relatively higher temperature for Co- and NiCo-containing Finemet. Especially for the magnetic field annealed NiCo-containing Finemet, the μi is evidently improved in the temperature range between 200-600°C with respect to the sample without magnetic field annealing.