Critical behavior in spin-reorientation phase transitions: (ErxR1x)2Fe14B (R=Nd, Dy) magnets

Abstract
The critical behavior of spin-reorientation phase transitions in the hard magnetic intermetallics (Erx R1x )2 Fe14B (R=Dy and Nd) has been studied with ac low-field susceptibility, χH, and cone-angle measurements. A simple model for scaling the low-field susceptibility has been developed and applied to the present series of compounds. The critical exponents for χH have been determined for some well-behaved compounds.