Modeling of metal-dielectric nanocomposite coatings with ferromagnetic inclusions for electromagnetic protection of electronic devices

Metal-dielectric nanocomposite system with ferromagnetic inclusions was prepared and studied: epoxy resin-xFe (x = 0-30 vol.% is a content of the Fe nanoparticles). Its dielectric and magnetic spectra were measured in a broad frequency range from 10⁶ Hz to 10¹⁰ Hz. Both dielectric and magnetic dispersion was observed. Based on the experimental spectra of the complex permittivity and permeability, reflection and transmission coefficients of of the composite layers in a free space were calculated depending on the content of ferromagnetic inclusions and layer thickness. Microwave absorption of the studied metal-dielectric composites varies in a broad rage and can be controlled by changing the concentration of ferromagnetic inclusions. The composites can be used as microwave absorbing or shielding materials.