Complex permittivity, complex permeability and microwave absorption properties of ferrite-paraffin polymer composites

Abstract

We have investigated the electromagnetic (EM) characteristics of CoxMn1-xFe2O4 spinel ferrite (where x = 0.0, 0.5 and 1.0) nanoparticles (NPs)/paraffin nanocomposite material at 8-20 GHz. CoxMn1-xFe2O4 NPs have been synthesized by cetyltrimethylammonium assisted hydrothermal route using NaOH. A variation in complex dielectric permittivity and magnetic permeability at room temperature with frequency in the range 8-20 GHz has been studied. Particles showed phase purity and crystallinity in powder X-ray diffraction (XRD) analysis. At the same time, CoxMn1-xFe2O4 NPs demonstrated a spinel cubic structure from XRD results. A reflection loss of -46.60 dB was found at 10.5 GHz for an absorber thickness of 2 mm. CoxMn1-xFe2O4 may be attractive candidates for EM wave absorption materials. (c) 2011 Elsevier B.V. All rights reserved.