<p>As a key material for power conversion equipment, soft magnetic composites require high magnetic permeability and low eddy current losses to adapt to the development of high-frequency and miniaturization of electronic devices. In this work, in order to effectively combine the advantages of organic and inorganic coating agents, FeSiBCr amorphous soft magnetic composites insulated with silicone/Fe₃O₄ composite coating were fabricated, and the effect of the content of silicone/Fe₃O₄ on the magnetic properties of the composites was investigated. A simplified finite element model was developed using Maxwell software to investigate the mechanism of insulating coating effects on eddy current losses in the composites. The results show that the density of the soft magnetic composite coated with 5% silicone resin/Fe₃O₄ increased by 14.9%. Appropriate addition of silicone/Fe₃O₄ coating agent thus improved the frequency performance of the FeSiBCr soft magnetic composite, demonstrating good high-frequency stability. When the content of silicone/Fe₃O₄ was 3%, the real part of the permeability of the material was the largest, the eddy current loss factor and hysteresis loss factor were the lowest, and the magnetic loss value was the lowest. Core loss of the 3 wt.% silicone/Fe₃O₄-coated sample was 41.53 W/kg (at 0.05&#xa0;T and 140&#xa0;kHz), which was decreased by 19.23% compared to that with 1 wt.% silicone/Fe₃O₄ coating.</p> Graphical Abstract