Effect of shell permutation on electromagnetic properties of ZnFeO4/(PANI, SiO2) core/double-shell nanostructured disks

Abstract

ZnFe2O4/PANI/SiO2 (ZPS) and ZnFe2O4/SiO2/PANI (ZSP) core/double-shell nanostructured disks comprising PANI conducting dielectric shell and SiO2 insulating dielectric shell on a disk-shaped ZnFe2O4 magnetic core are prepared to study the effect of shell permutation on their electromagnetic properties. The complex relative permittivity (£` r = £` r ¡¬ - j £` r ?) and permeability (£g r = £g r ¡¬ - j £g r ?) of ZPS and ZSP are measured, and the reflection loss (RL) is determined, together with the ZnFe2O4 core, in the 1-18'GHz range. £` r ¡¬ and £` r ? in ZPS and ZSP are smalle