Magnetic properties of ternary rare earth compounds of the type RCo10Ti2

Abstract The magnetic properties of rare-earth compounds of the type RCo 10 Ti 2 (R  Gd, Tb, Dy, Ho, Er and Y) were investigated by means of high-field measurements and AC-susceptibility measurements. From the experimental values of the saturation magnetisation at 4.2 K, we have derived the magnitude of the Co moments in these compounds, which were found to be almost invariant across the series ( μ Co = 0.95 μ B ). By contrast, high-field measurements made on compounds of the series YCo 12− x Ti x showed that the Co moment decreases very strongly with Ti concentration. A similar strong decrease is displayed by the corresponding Curie temperatures. We have determined the easy magnetisation direction in the various RCo 10 Ti 2 compounds and found that the Co-sublattice anisotropy favours an easy moment direction along the c -axis. The rare-earth-sublattice anisotropy is governed by a positive value of A 2 0 and seems to have increased relative to the Co-sublattice anisotropy compared to the situation in RCo 11 Ti.