High performance in soft magnetic composites of Fe-Fe4N particles

High frequency magnetic properties of nitrided carbonyl iron powder soft magnetic composites (SMCs) were investigated. Fe-Fe 4 N particles with different Fe 4 N contents have been prepared by nitriding carbonyl iron powder at different treatment temperature and time. With increasing Fe 4 N content in Fe-Fe 4 N particles, the operating frequency of Fe-Fe 4 N particles SMCs increased from 17.8 MHz to 132.6 MHz, while the core loss decreased from 1481.3 kW/m 3 to 1070.8 kW/m 3 at 3 MHz and 10 mT. The loss analysis indicates that with increasing Fe 4 N content in Fe-Fe 4 N particles, the eddy current loss decreased from 920.8 kW/m 3 to 201.4 kW/ m 3 , the decline was approximately 78.1 %. It can be seen that the enhancement of the internal resistivity of the particles by nitriding carbonyl iron powder suppresses the loss of Fe-Fe 4 N particles SMCs, which is an effective way to improve their operating frequency.