High-frequency magnetic properties of low-temperature sintered CoTi substituted barium ferrites

CoTi substituted barium ferrites BaFe12−2xCoxTixO19 were prepared by a modified chemical coprecipitation method and low-temperature sintering with Bi2O3 doping. Effects of CoTi substitution amount and the barium ferrite particles fabrication temperature on high-frequency magnetic properties were investigated. The initial permeability of sintered barium ferrites could be promoted effectively with Bi2O3 doping. Higher temperature for barium ferrite particles fabrication resulted in higher permeability for sintered ferrites. Barium ferrites with initial permeability μ′>10, magnetic resonant frequency >1 GHz were obtained when they were sintered at 900 °C with 2 wt.% Bi2O3 doping in the CoTi substitution range of 1.20–1.30. The effect of Bi2O3 doping on the magnetizing process of sintered ferrites was also discussed.