Good sintered permanent magnet of the thermal stability

摘要

A permanent magnet having good thermal stability, consisting essentially of the composition represented by the general formula: R(Fel-x-y-zCoxByGaz)A wherein R is Nd alone or one or more rare earth elements mainly composed of Nd, Pr or Ce, 0/=x/=0.7, 0.02/=y/=0.3, 0.00l/=z/=0.l5 and 4.0/=A/=7.5. This permanent magnet may contain one or more additional elements selected from Nb, W, V, Ta and Mo. This permanent magnet has high coercive force and Curie temperature and thus highly improved thermal stability.