Preparation and magnetic properties of BaFe12O19/Ni0.8Zn0.2Fe2O4 nanocomposite ferrite

► BaFe12O19/Ni0.8Zn0.2Fe2O4 was prepared by sol-gel route. ► The exchange coupling of BaFe12O19/Ni0.8Zn0.2Fe2O4 was influenced by the temperature. ► The remanence of BaFe12O19/Ni0.8Zn0.2 Fe2O4 is 36 emu/g. ► BaFe12O19/Ni0.8Zn0.2Fe2O4 has the higher magnetic property than BaFe12O19 and Ni0.8Zn0.2Fe2O4.