MAGNETIC STUDIES OF ND2-XYXFE14B AND ND2-XYXFE13CUB COMPOUNDS

Structural and magnetic properties of Nd2-xYxFe14-yCuyB compounds with x = 0, 0.5, 1.5, 2 and y = 0 and 1 have been studied by X-ray diffrac tion, ac initial susceptibility and magnetic measurements. The magneti zation has been measured at 4.2 K in fields of 140 kOe. The compounds crystallize in a tetragonal P4(2)/mnm-type structure. Substitution of Y for Nd results in decreases in saturation magnetization, anisotropy field, Curie temperature and spin reorientation temperature. The chang es in spin reorientation temperatures with increasing Y concentrations are discussed in the combined crystal field-exchange field model. Bas ed on these measurements, the temperature composition diagrams of spin arrangements appearing in Nd2-xYxFe14B and Nd2-xYxFe13CuB systems hav e been established.