What is it about?

This study demonstrates that replacing $10\text{--}14\text{ wt}\%$ of expensive insulated iron powder with lower-cost, uncoated ferrophosphorus (Fe-P) particles boosts the DC magnetic permeability of soft magnetic composites (SMCs) by $15\text{--}18\%$. The surrounding insulated particles effectively maintain low eddy current losses at frequencies up to $500\text{ Hz}$, offering a cost-effective material solution for low-to-medium frequency electromagnetic applications.

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Why is it important?

SMCs are critical for compact electromagnetic devices, but their non-magnetic insulation inherently reduces overall magnetic permeability compared to electrical steels. At the same time, specialized insulated powders carry a high market price. - Reduces Raw Material Costs: Uses uncoated Fe-P powder, which costs less than 50% of insulated Somaloy® powder, significantly lowering production expenses. - Help Overcomes Permeability Limits: Increases maximum DC permeability by 15–18% by mitigating internal demagnetising fields and enhancing domain wall mobility. - Preserves Dynamic Performance: Retains low core losses up to 500 Hz, making it directly applicable for real-world inductors, actuators, and electrical machine cores. - Uses Scalable Processing: Relies on standard industrial powder metallurgy routes—conventional pressing and $500^\circ\text{C}$ steam oxidation passivation.

Perspectives

In materials science, finding the right balance between magnetic performance and manufacturing costs is often a major hurdle for widespread industrial adoption. By demonstrating that we can introduce lower-cost, uncoated Fe-P particles into an insulated matrix without compromising high-frequency loss suppression, this study provides a realistic, scalable blueprint for producing cost-effective soft magnetic components.

Radovan Bures
Institute of Materials research of Slovak Academy of Sciences

Read the Original

This page is a summary of: Enhancing DC permeability of soft magnetic composites by addition of uncoated cost-efficient FeP particles, Journal of Magnetism and Magnetic Materials, October 2026, Elsevier,
DOI: 10.1016/j.jmmm.2026.174523.
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