Hexagonal SrFe12O19 ferrite with high saturation magnetization

Hexagonal M-type ferrites with a nominal composition SrFe12O19 (SrM) were prepared via a ceramic route using acicular goethite (α-FeOOH) nanopowders obtained at different hydrothermal temperature as one of the starting materials, and their structural and magnetic properties were investigated. The best hydrothermal temperature of α-FeOOH used was found to be 1ower than 180 °C, and the best sintering temperature of SrM should be 1200 °C. The highest saturation magnetization of SrM reaches 76.7 emu/g, a very high value rarely found in the SrM ferrites without any substitution or dopant.