Abstract: LaCo_13-xAl_x ribbons were made by means of melt spinning technique at an optimum Cu wheel velocity of 30 m/s. Structural and magnetic properties of LaCo_13-xAl_x compounds were investigated by using X-ray diffraction and magnetic measurements. It was found that all the compounds are almost of a single phase with the cubic NaZn₁₃ structure. The lattice parameters increase monotonically with increasing Al content for all the compounds investigated. The saturation magnetization M_s decreases with increasing Al content. LaCo_13-xAl_x compounds are good soft magnetic materials with almost no remanence and coercivity. 

Key words: LaCo₁₃, melt-spun ribbon, magnetic property, rigid model