Flux loss in nanocomposite magnets

The irreversible flux loss due to exposure to an elevated temperature was e valuated systematically for nanocomposite magnets with various coercivity v alues. It was found that the short-term and long-term flux losses in some n anocomposite magnets are smaller than in a conventional isotropic Nd-Fe-B m agnet despite their small coercivity values. The origins of the observed sm all values for flux loss were studied by using the proposed model. It was c larified that the observed small values for the short-term flux loss in the nanocomposite magnets fan be attributed to the squareness of a demagnetiza tion curve of the nanocomposite magnets not deteriorating at an elevated te mperature. The small values for the irreversible susceptibility of the nano composite magnets reasonably explained their small values for long-term flu x loss.