Abstract
SrFe12O19 and CoFe2O4 powders obtained via a chemical coprecipitation method were used to prepare SrFe12O19/CoFe2O4 composites after sintering at 1200 °C, and the structure, the magnetic properties and the effects of aligning magnetic field during molding are studied. Only SrFe12O19 and CoFe2O4 without any other impurity phase were found in all the composites, and the exchange coupling interaction was proved to exist by using the Henkel plots and the magnetic recoil loops. The exchange coupling interaction resulted in the improvement of saturation magnetization, but the reduction of coercivity in composite specimens. It was also found that for SrFe12O19/CoFe2O4 composites, the aligning magnetic field helped to improve the saturation magnetization and the coercivity, but did not affect the phase composition, the morphology and the exchange coupling interaction obviously.
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