Abstract
The magnetizations of pseudo-binary Y1−xRxCo5 (R=Pr, Sm) single crystal compounds were measured at 4.2 K along the principal crystallographic axes. The magnetic moment per formula unit increases linearly with increasing x. The estimated values of the magnetic moments of Co atom in the compounds are independent of x and R elements. The magnetocrystalline anisotropy constants K20 and K40 were determined from the analysis of the hard magnetization curve. The values of K20 and K40 for Pr compound system increase quadratically with increasing x, and those of Sm compound system increase almost linearly with increasing x. We estimated the contribution of the single ion anisotropy and the two ion anisotropy for PrCo5 and SmCo5 compounds. For PrCo5 compound, the two ion anisotropy constant was the same order of magnitude as the single ion one and of opposite sign to it, and for SmCo5 compound, the former is negligibly smaller than the latter. The calculated value of the single ion anisotropy constant using point charge model is compared with the experiments.
