Co2+ and Al3+ substituted La-Zn ferrites synthesized by sol-gel auto-combustion method with glycine as a fuel, calcination temperature of samples confirmed from TGA analysis. The observed elemental analysis (EDAX) is in good agreement with the theoretical composition. The lattice constant decreases while the crystalline size increases with the increase in concentrations of dopant. Zn2+ ions prefer to occupy the tetrahedron site and other ions mainly enter octahedron site. The I.R. spectra have shown two principle absorption bands near 600 and 400 cm−1. SEM and TEM images reveal well defined nanoparticles with slight agglomeration. Magneton number decreased with dopant substitution.