Development of spinel ferrite-based composites for efficient EMI shielding

In this article, erbium (Er) substituted lithium ferrite/carbon black composites are synthesized, and the effect of Er substitution on the morphological, structural, complex permeability, permittivity, and EMI shielding effec-tiveness of the composites are investigated. An enhancement in the lattice constant, saturation magnetization, and coercivity is observed with the initial concentration of the Er. Insertion of Er in place of Fe promoted 3d-4f coupling, leading to variation in magnetic, dielectric, and conduction mechanisms. A prominent enhancement in the shielding effectiveness is obtained. Shielding effectiveness due to absorption played a significant role rather than reflection. Maximum saturation magnetization and total shielding effectiveness (SET) of 66 emu/g and 33.7 dB (@ 17.3 GHz) are obtained for LE6FO/CB. The permittivity and permeability also improved. The obtained results (saturation magnetization, permittivity, permeability, magnetic and dielectric loss) indicate that LE6FO/ CB is a promising candidate for EMI shielding applications.

Automated summary

Erbium substituted lithium ferrite/carbon black composites were synthesized and their morphological, structural, complex permeability, permittivity, and EMI shielding effectiveness were investigated. The substitution of Er resulted in an enhancement in lattice constant, saturation magnetization, and coercivity. 3d-4f coupling was promoted due to the insertion of Er, leading to variation in magnetic, dielectric, and conduction mechanisms. The shielding effectiveness was significantly improved, with absorption playing a more important role than reflection. The obtained results indicate that LE6FO/CB is a promising candidate for EMI shielding applications.