Abstract
The critical behavior of spin-reorientation phase transitions in the hard magnetic intermetallics (${\mathrm{Er}}_{\mathrm{x}}$${\mathrm{R}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${)}_{2}$${\mathrm{Fe}}_{14}$B (R=Dy and Nd) has been studied with ac low-field susceptibility, ${\ensuremath{\chi}}_{H}$, 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 ${\ensuremath{\chi}}_{H}$ have been determined for some well-behaved compounds.
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