Magnetic properties of Iron nitride (γ’-Fe₄N) laminated cores for high frequency energy applications

Iron nitride (γ’-Fe₄N), has shown itself to be a promising soft magnetic material, ideal for many energy conversion applications, including as a cores in both inductors and transformers. Because this material can be synthesized using readily available elements, it shows potential as a cheaper alternative to other soft magnetic materials, eliminating the need for critical materials. This work presents a novel fabrication method of laminated γ’- Fe₄N cores, fabricated via high pressure spark plasma sintering (SPS). Layers of γ’-Fe₄N are insulated between layers of magnetite (Fe₃O₄), all of which is simultaneously solidified under the SPS to produce a complete core. This work aims to increase magnetic permeability, lower coercivity and reduce core loss through refining of the fabrication process and reduction of powder particle size. Continuous improvement in the overall microstructural quality moves this material closer to implementation in high frequency energy applications.