Temperature dependence of irreversible flux loss field in sintered ferrite magnets

Abstract

This letter discusses the temperature dependence of the magnetic field at which irreversible magnetic flux loss of ferrite sintered magnets is initiated. In this material class such a field might reduce linearly: comparable behavior to that observed for Nd-Fe-B-based sintered counterparts increases linearly or even peaks for temperatures above 350 K. These differences are attributed to variations in the saturation polarization and magnetocrystalline anisotropy constant(s) of the hard-magnetic phase arising from changes in the chemical composition. A comparison between HK and HD5, where the latter is defined in an IEC standard, is also presented and discussed.