Interface engineering constructs oxide composite bulk γ′-Fe4N magnetic alloys with high resistivity: Superior magnetization and manufacturability

Soft magnetic material with high saturation magnetization ( M s ) and high resistance ( ρ ) is vital to improve the power density and conversion efficient of modern electrical magnetic equipment. Yet, increasing M s is always at the expense of high resistivity, such as soft magnetic alloys substitute for the ferrite. In this work, the superior comprehensive electromagnetic properties, namely the close association of high saturation magnetization and high resistivity, are combined in a new way in a newly Fe-N based magnetic materials. A high resistance oxide interface engineering was constructed between the conducting ferromagnetic phases in the process of spark plasma sintering (SPS) to achieve superior electromagnetic properties. The ZnO composite γ' -Fe 4 N bulk has a maximum resistivity of 220 μΩ cm and a M s of up to 156.02 emu/g, while the TiO 2 composite γ' -Fe 4 N bulk has a maximum resistivity of 379 μΩ cm and a M s of 149.7 emu/g. The research findings offer valuable insights for the advancement of the next generation of soft magnetic materials, which hold significant potential for use in high-frequency, high-efficiency, and energy-saving power equipment applications.