Abstract
A systematic study of the effect of pressure up to 1 GPa on the spin reorientation transition (SRT) phenomena has been performed on several series of pseudoternary compounds (ErxR1-x)2Fe14B for R identical to Nd, Gd, Dy and Y using a low-field AC susceptibility technique. The variation in the SRT temperature TSR under pressure has been used as an indication of the effect of the pressure on the crystal electric field (CEF) at the rare-earth ion site. The authors have observed that the pressure effect on the Er2Fe14B compound ( Delta TSR/ Delta p=-20 K GPa-1) was not affected by the substitution of Er by Gd and Y ions. A completely different high-pressure behaviour has been observed for the (ErxDy1-x)2Fe14B and (ErxNd1-x)2Fe14B compounds, in which the variation in TSR under pressure decreases for increasing content of Dy and Nd. This different behaviour has been attributed to the strong influence of pressure on the CEF interactions. Using these results the authors have determined the variation in the CEF parameters under applied pressure.
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