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TEMPERATURE DEPENDENCE OF THE ANISOTROPY CONSTANTS K 1 AND K 2 OF R 2 Fe 14 B(R=Ce, Pr, Gd)

The temperature dependence of the anisotropy constants K 1 , K 2 and the anisotropy field H A . of R 2 Fe 14 B (R = Ce, Pr, Gd) have been measured in temperature range of 1.5 K to 300 K. And the contribution of Pr 3+ ions to the magnetocrystalline anisotropy of Pr 2 Fe 14 B compound was calculated by the single ion theory. The result is semiquantitatively consistent with the experiment.