Theoretical model calculates effective permeability in metallic soft magnetic composites, indicating strong agreement with laboratory results.
Soft magnetic composites made from metallic magnetic particles with an easy magnetization plane (referred to as easy-plane metallic SMC) are considered ideal materials for the next generation of power electronic devices. This is attributed to their capability to maintain high permeability at elevated frequencies. Despite these advantages, a definitive mathematical model connecting the high-frequency magnetic properties (e.g., effective permeability) of easy-plane metallic SMC to the intrinsic properties of easy-plane particles does not yet exist. In this work, a theoretical calculation model for the effective permeability of easy-plane metallic SMCs was formulated. This model was derived from a skin effect-corrected Landau-LifshitzGilbert (LLG) equation and integrated with effective medium theory incorporating inter-particle interaction. To validate the model, samples of easy-plane Y 2 Co 17 particle/PU SMC with varying particle sizes and volume fractions were prepared. The experimental results showed a strong agreement with the calculated values. This research offers critical theoretical backing for the design and optimization of soft magnetic materials intended for high-frequency applications.
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Tan et al. (2025) studied this question.
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