Regulation of magnetic and electrical performances in core-shell-structured FeSiCr@BaTiO3 soft magnetic composites

Soft magnetic composites (SMCs) are extensively used for designing and manufacturing high-performance electronic devices, such as inductors, filters, mutual inductors and chokes, owing to their high effective permeability (mu(e)) and stable magnetic properties. However, the production of SMCs that meet the demands of high resistivity, high effective permeability (mu(e)), and low core losses (P-cv), which are required for high-frequency miniaturized electronic systems, is challenging. In this study, we improve the electromagnetic performance of SMCs by coating FeSiCr metal particles with BaTiO3 dielectric ceramic powder at various concentrations (0.00-3.75 wt%). The micro-morphological, static magnetic, resistivity (rho), and core loss (P-cv) properties of FeSiCr@BaTiO3 SMCs are comprehensively investigated. Energy dispersive spectroscopy ele-mental distribution mapping is used to confirm the formation of core-shell structures with excellent coating quality. With an increase in the BaTiO3 dielectric powder content, the core losses, P-cv (at 800 kHz, 10 mT and 25 degrees C), initially decrease and subsequently increase, and comprise hysteresis losses (P-h) and eddy current losses (P-e). Moreover, owing to the introduction of the non-magnetic-phase BaTiO3 powder, hysteresis losses increase monotonically, whereas eddy current losses exhibit the opposite trend. The FeSiCr@BaTiO3 SMC5 with 2.25 wt% BaTiO3 dielectric ceramic powder exhibit outstanding comprehensive electromagnetic properties with an effective permeability of mu(e) = 48, saturated magnetization of M-s = 115 emu/g, core losses of P-cv = 42 mW/cm(3) (at 800 kHz, 10 mT and 25 degrees C), and resistivity of rho = 2.74 x 10(5) Omega.m. These state-of-the-art FeSiCr@BaTiO3 SMCs present considerable potential for application in high-performance power devices and components. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the improvement of electromagnetic performance of soft magnetic composites (SMCs) by coating FeSiCr metal particles with BaTiO3 dielectric ceramic powder. It was found that with an increase in the BaTiO3 dielectric powder content, the core losses initially decrease and subsequently increase. FeSiCr@BaTiO3 SMC5 with 2.25 wt% BaTiO3 exhibit outstanding comprehensive electromagnetic properties, showing potential for application in high-performance power devices and components.