Investigation of Heat Treatment Effect of Amorphous Magnetic Materials in AC Magnetic Field

Abstract

　In order to realize a new heat treatment method for Fe-based amorphous magnetic materials (FeSiB) by means of induction heating, effect of the heat treatment in AC magnetic field on magnetic properties is firstly investigated. In this time, the heat treatment is performed by using an electric furnace. The samples used in this measurement are 60 mm x 350 mm sheets. The temperature is controlled to be a reference temperature well below the crystallization temperature of FeSiB. The AC magnetic field is added to the samples with a solenoid coil and the excitation frequency during heat treatment is changed from 60 Hz to 2 kHz. After heat treatment, the magnetic properties of the samples are measured with the single sheet tester (SST). The results showed that the magnetic properties heat-treated in an AC magnetic field show similar tendency to one of the conventional methods in a DC magnetic field.