The magnetic stability of RE-FeB (RE = Nd or Pr) sintered magnets above room temperature was investigated by monitoring the squareness factor (SF). At 293 lesTles 423 K, commercial anisotropic NdFeB-based sintered magnets with a Curie temperature (Tc) of around 585 K showed no appreciable change in their squareness factors. This indicates that the SF is controlled mainly by the samples' microstructural features. Magnets withTc> 593 K showed a tendency for improved squareness factor at higher temperatures due to the methodology employed to characterize the SF. On the other hand, PrFeCoBCuNb sintered magnets withTc> 593 K presented a reduction in the SF with temperature rising from 298 to 373 K.
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Périgo et al. (2009) studied this question.
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