Magnetic properties and loss separation in FeSi/MnZnFe2O4 soft magnetic composites

• Successful preparation of soft magnetic composite FeSi/MnZnFe2O4.
• Study of the complex magnetic permeability.
• Comparison of different compositions of prepared SMC's.
• Determination of parts of magnetic losses.

We investigated composites that have been prepared from FeSi powders covered with MnZnFe2O4 (MnZn ferrite), which was prepared by sol–gel synthesis accompanied with the auto-combustion process. The aim of this paper is to analyze the complex permeability and core losses of prepared samples with different amount of MnZn ferrite. The microstructure and the powder morphology were examined by scanning electron microscopy. Magnetic measurements on bulk samples were carried out using a vibrating sample magnetometer, an impedance analyzer and hysteresisgraphs. The results indicate that the composites with 2.6 wt% MnZn ferrite show better soft magnetic properties than the composites with about 6 wt% MnZn ferrite.