Magnetic properties of DyCo10−xNixSi2 compounds

The temperature dependence of the magnetization of DyCo10−xNixSi2 compounds with x=0, 2, 4, and 6 was measured in fields up to 5.0 T and in the temperature range from 4.2 to 300 K in a SQUID magnetometer. Compensation temperatures were observed for the compounds with x=4 and 6. The values of the R‐T exchange interaction obtained by fitting the M‐T curves on the basis of two‐sublattice molecular‐field theory are compared with the values obtained from high‐field magnetization measurements on powder particles free to be oriented by the applied field. In all four compounds magnetic transitions are found in the ac‐susceptibility measurements which were carried out between 4.2 K and room temperature. The types of magnetic anisotropy were investigated by magnetization measurements on samples that were magnetically aligned at room temperature.