Abstract
Competing single-ion 4f magnetic anisotropies have been studied within a noncollinear three-sublattice mean-field crystal-electric-field model in order to explain the observed complex magnetic behavior in the pseudobinary series ${\mathrm{Pr}}_{\mathit{x}}$${\mathrm{Nd}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Co}}_{5}$. The interplay of different magnetic anisotropies gives rise to a contribution in the spontaneous free energy which turns out to have a minimum for the direction of the magnetization along a non-major-symmetry direction. A comparison with the experimental data of the spin-reorientation temperature and also with the thermal evolution of the spontaneous-spin-reorientation angle has allowed the determination of a reliable set of crystalline-electric-field parameters for the ${\mathrm{Pr}}^{3+}$ and ${\mathrm{Nd}}^{3+}$ ions. A calculation of the theoretical magnetization isotherms has been undertaken using these crystalline-electric-field parameters, in order to determine the theoretical magnetic anisotropy field, which has been compared for different temperatures and concentrations with experimental results obtained from singular-point-detection measurements.
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