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The sol-gel approach was used to synthesise lanthanum and aluminium doped yttrium ferrite nanoparticles. The absorption peak is observed at ~265 nm corresponds to band gap of 2.9–3.1 eV. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM) and High-Resolution Transmission Electron Microscopy (HR – TEM) were used to analyse the structural and microstructural properties of the product. The particle size calculated to be 60–110 nm from the HR-TEM analysis. The vibrating sample magnetometer (VSM) showed high magnetisation with reversible loop and increased surface-induced magnetisation, the presence of all elements were confirmed using energy Dispersive X-Ray Spectroscopy (EDS). From BET analysis, the surface area, pore volume and pore diameter are 2.688 m2 g−1, 5.178 cm3 g−1 and 7.704 nm respectively, the isotherm represents type (V), with an H3 hysteresis loop. The obtained product, La1−XAlXYYFe2−YO4, showed good photo-catalytic activity when employed for the photo-catalytic degradation of methyl red dye within 210 min. Highlights: The lattice constant increases in the concentration of x, indicating the cubic spinel structure. In La1−XAlXYYFe2−YO4 Bohr magneton, anisotropy and coercivity increases with increase in the concentration of x. Ms, Mr increases with concentration of Aluminium and Yttrium substitution, confirming the B-site occupancy of Lanthanum ion. Catalyst for the successful photocatalytic degradation of methyl red dye within 210 min. [ABSTRACT FROM AUTHOR]