Abstract
Among the rare earth-Co 2 Laves phases, HoCo 2 and NdCo 2 show a spin reorientation at about 15 and 43 K, respectively. At low temperature in both compounds the easy direction of magnetization is [110]. On heating up the samples the easy direction changes to [100] at the temperatures given above. Such a spin reorientation is explained by the combined effect of crystalline field and exchange interaction. The aim of this paper is to present theoretical calculations and experimental results concerning the influence of replacing the magnetic rare earth ions in HoCo 2 and NdCo 2 by non-magnetic Y on the spin reorientation temperature. It was found that the spin reorientation temperature decreases in (Nd, Y)Co 2 and increases in (Ho, Y)Co 2 with increasing Y concentration. Experimental data obtained from resistivity measurements are compared with theoretical results.
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