Hexagonal barium ferrite (BaFe12O19) nano-particles have been successfully synthesised using selfassembly
method. Diethyleneamine (DEA) surfactant was used to fabricate the micelle structure of Ba-DEA complex
under various DEA concentrations. BaFe12O19 powders were synthesized with addition Fe ions to Ba-DEA
complex and then heat treated at temperature range of 800~1000℃. The molar ratio of Ba/DEA and heat-treatment
temperature significantly affected the magnetic properties and morphology of BaFe12O19 powders. BaFe12O19
powders synthesized with Ba/DEA molar ratio of 1 and heat-treated at 1000℃ for 1 hour showed the coercive
forces (iHc) of 4.84 kOe with average crystal size of about 200 ㎚.