Single-phase SrFe₁₂O₁₉ (SHF) and CoFe₂O₄ (COF) crystalline powders obtained from the mechanical alloying process were mixed with aqueous media with mass proportions of 80:20 and then irradiated ultrasonically. Composite samples were made from dry powder mixing and then compacted through a compacting process in a cylindrical mould to produce green compact samples. The green composite samples were sintered at different temperatures of 1100°C, 1150°C, and 1200°C for two hours. Observation of the microstructure of the samples confirmed that all the samples had a composite structure consisting of SHF and COF particles. The mean size of the particles in the composite samples was much larger than the mean crystallite sizes of SHF and COF. The two types of particles in the composite were randomly distributed with no preferred orientation. The results of the evaluation of the magnetic properties of the composite samples showed that the magnetic properties were between those of SHF and COF. It was found that the optimal value was obtained when the sample was sintered at 1200°C, producing a remanence of Mr = 38.11 emu/g, saturation magnetization of Ms = 67.42 emu/g, and maximum energy product of (BH)max = 1.85 MGOe.
