Abstract:
A complex investigation of the structural, magnetic, and magnetothermal properties of the Tb$_{0.3}$Dy$_{0.7}$Co$_2$ compound synthesized with the use of high-purity rare-earth metals has been performed. The phase composition has been controlled using the X-ray structural analysis, and the topology of the alloy surface has been investigated using atomic-force microscopy. It has been established that the Tb$_{0.3}$Dy$_{0.7}$Co$_2$ compound is single-phase, while the samples selected for measurements possess a clearly pronounced texture. The magnetization has been measured using a vibrating-sample magnetometer in the fields up to 100 kOe in a temperature range from 4.2 to 200 K. The Curie temperature of the compound is 170 K. The data on the temperature dependence of heat capacity of Tb$_{0.3}$Dy$_{0.7}$Co$_2$ have been obtained. The magnetocaloric effect $\Delta T$ has been measured by a direct method in the fields up to 18 kOe applied both along and perpendicularly to the texture axis. The anisotropic behavior of the magnitude $\Delta T$ for this compound, which possesses the cubic structure, has been found. The maximum value of the magnetocaloric effect $\Delta T$ = 2.3 K ($\Delta H$ = 18 kOe) has been observed upon applying the magnetic field along the texture axis.
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