Low-Temperature Annealing Patterns and Demagnetization Curves in Sintered Nd-Fe-B Magnets

摘要

In order to trace the annealing temperature dependence of the coercivity in sintered Nd-Fe-B magnets systemtically, we examined a single successive annealing (SSA) method, in which the coercivity value of a single sample is successively recorded after each annealing cycle at T_a=.w—4°C Iinth a idn dc0ir7teiomne1 tnot s0t0 hoef ΔcoTerac i=v i1ty0 values, we paid special attention to the shapes of demagnetization curves, in terms of the differential susceptibility versus magnetic field plot, which provides information on the nucleation field distribution (NFD). Samples with smal