Influence of Ferrite and Resin Content on Inner Demagnetizing Fields of Fe-Based Composite Materials with Ferrite-Resin Insulation

Abstract

In this paper, we investigated the influence of ferrite and resin content on inner demagnetizing fields and initial magnetization curves of Fe-based soft magnetic composites with ferrite-resin insulation. The inner demagnetization factor was determined from anhysteretic curves. Samples containing ferrite exhibited lower inner demagnetization factor than those with pure resin insulation. The highest content of ferrite resulted in the increase of porosity, slightly increasing the demagnetization factor. The measured initial curves were recalculated to soft magnetic composites “without pores and resin”, meaning that they contains 100% of magnetic material with infinitely low non-magnetic (resin and pores) content. This revealed the high involvement of ferrite particles in magnetization reversal, and their good interaction with Fe particles. Moreover, this confirmed that ferrite particles in the prepared SMCs act as appropriate magnetically active insulator.