Effect of annealing treatment on electromagnetic parameters and wave-absorbing properties of Fe-based soft magnetic particles

Abstract Fe-based soft magnetic particles have excellent soft magnetic properties but have limitations in practical applications. In order to obtain better wave-absorbing properties, Fe-based soft magnetic particles have been modified to meet the demand for their properties. The wave-absorbing properties of Fe-based soft magnetic amorphous powders are improved by annealing them, because annealing not only increases the dielectric constant and permeability of the material but also improves the soft magnetic properties of the material and increases the impedance matching of electromagnetic waves. Compared with the as-prepared state, although the annealing treatment cannot increase the peak value of the wave absorption peak, it can make the wave absorption frequency domain wider and the area of the wave absorption peak larger. The samples annealed at 500°C have excellent wave-absorbing properties in the 8-10 GHz and 14-18 GHz bands.