Improved permeability and core loss of iron-based soft magnetic composites prepared by interface diffusion of nitrogen atoms

The magnetic properties of SMCs are typically challenging to further enhance, after compaction into a specific shape. However, in this study, a gas-nitriding process is employed to diffuse nitrogen atoms into iron-based magnetic toroidal after being prepared, resulting in an improvement in effective permeability and reduction in core losses. The results indicate that the saturation magnetization decreases with increasing nitriding time, reaching its minimum value at a nitriding time of 24 h, where Ms measure at 199.8 emu/g. The sample nitrided for 12 h exhibits superior effective permeability, high-frequency stability, DC-bias property, and total core loss, indicating its suitability for high-frequency applications. The gas-phase nitride process can further enhance the performance of the prepared soft magnetic composites, which is of significant value in scientific applications.