Abstract: Magnetocrystalline anisotropies of (Nd_1-xEr_x)₃Fe_27.31Ti_1.69 compounds were investigated by means of X-ray diffraction and VSM and magnetic measurements. All the compounds with χ in a range of 0~0.5 crystallize in Nd₃(Fe,Ti)₂₉-type structure. As temperature decreases from room temperature to 5 K, a spin reorientation from the easy plane to the easy cone occurs for (Nd_1-xEr_x)₃Fe_27.31Ti_1.69 compounds.

Key words: (Nd_1-xEr_x)₃Fe_27.31Ti_1.69 compounds, vibrating sample magnetometer, X\|ray diffraction, magnetocrystalline anisotropy