Hexagonal barium ferrite (BaFe12O19) nano-particles have been successfully fabricated by spraypylorysis
process. BaFe12O19 precursor solutions were synthesized by self-assembly 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 of Fe ions to Ba-DEA complex and then fabricated
BaFe12O19 powders by spray-pyrolysis process at the temperature range of 800~1000oC. The molar ratio of Ba/
DEA and heat-treatment temperatures significantly affected the magnetic properties and morphology of BaFe12O19
powders. BaFe12O19 powders synthesized with Ba/DEA molar ratio of 1 and heat-treated at 900oC showed the
coercive forces (iHc) of 4.2 kOe with average crystal size of about 100 nm.