Optimizing the high-frequency magnetic properties of Fe-based nanocrystalline soft magnetic composites by incorporating carbonyl iron powder

The article delves into the optimization of high-frequency magnetic properties in Fe-based nanocrystalline soft magnetic composites by incorporating carbonyl iron powder (CIP). It explores the microstructural analysis of CIP and gas-atomized FePSiBCNbCu alloy powder, revealing how CIP's smaller particle size enhances packing efficiency and reduces porosity. The study systematically examines the impact of varying CIP concentrations on the density, porosity, and magnetic performance of the composites. Key findings include the identification of an optimal CIP concentration (15 wt.%) that balances improved density, reduced porosity, and enhanced magnetic properties. The article also discusses the mechanisms behind the observed improvements, such as the filling of interstitial voids and the reduction of domain wall pinning sites. Additionally, it compares the performance of the developed composites with other representative SMCs, highlighting the superior balance of soft-magnetic properties achieved. The conclusion underscores the effectiveness of powder microstructure engineering through controlled CIP addition as a strategy for enhancing the overall performance of nanocrystalline SMCs.