Synthesis of FeSiAl/SrFe₁₂O₁₉ soft magnetic composite materials with low magnetic loss

Abstract FeSiAl/SrFe 12 O 19 soft magnetic composite material was prepared by mechanically crushing FeSiAl powder and M‐type permanent magnet hexagonal ferrite powder according to a certain quality. Their structures, morphologies, and magnetic properties were studied using x‐ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), SQUID, and B−H analyzers. Compared to organic and other inorganic composite materials, SrFe 12 O 19 has a higher thermal decomposition temperature. The x‐ray diffraction pattern indicates that SrFe 12 O 19 phase was detected in the sample. Scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) images show that powdered SrFe 12 O 19 is dispersed on the surfaces and gaps of particles of different sizes. The magnetic analysis results indicate that although SrFe 12 O 19 increases the hysteresis loss of the material, its good insulation reduces eddy current loss. When the content of SrFe 12 O 19 is 2 wt.‐%, the magnetic loss is the lowest. The lower magnetic loss and higher thermal decomposition temperature of this composite material make it have a wider range of application prospects.