The spin-reorientation transition, magnetic anisotropy, and first-order magnetization process (FOMP) of R2Fe14BNx compounds with R = Pr or Nd have been investigated by ac-susceptibility measurements from 4.2 to 300 K, the singular-point-detection technique in a pulsed-field facility in fields up to 30 T between 4.2 and 500 K and magnetization measurements in the Amsterdam High-Field Installation in fields up to 35 T and 4.2 K. It is observed that, compared to the corresponding R2Fe14B compounds, the anisotropy field, B(a), and the critical field of the FOMP, B(cr), of R2Fe14BNx are dramatically reduced, whereas the spin-reorientation temperature T(SR), of Nd2Fe14BNx is only slightly decreased. These experimental data are analyzed in terms of the crystalline-electric-field interaction combined with the R-Fe exchange interaction.
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