Abstract-RF co-sputtered batches of nanocomposite Bi₃Fe₅O₁₂ – Bi₂Dy₁Fe₄Ga₁O₁₂ films optimized (using composition adjustments implemented by varying the RF powers at each target) with respect to the annealing crystallization temperature resulted in obtaining a new MO nanocomposite material that exhibits simultaneously a high MO quality and magnetization direction perpendicular to the film plane, which are the properties necessary for many applications based on magneto-photonic crystals (MPC).