Hexagonal SrFe12O19 ferrite with high saturation magnetization

摘要

Hexagonal M-type ferrites with a nominal composition SrFe12O19 (SrM) were prepared via a ceramic route using acicular goethite (alpha-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 alpha-FeOOH used was found to be lower than 180 degrees C, and the best sintering temperature of SrM should be 1200 degrees 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.