Synthesis of magnetically controlled Fe3O4 composites and their enhanced microwave absorption properties

Abstract

In this work, a new concept of dynamic granular arrays was proposed based on magnetically controlled particles. Method of external rotating magnetic field (ERMF), based on a dipole interaction of magnetic spherical Fe3O4 particles in highly ordered volume arrays is proposed and a design for its practical implementation is developed. The paper also presents a method for the formation of flat microspherical particles arrays using a dipole magnetic field of a given geometric shape. Reflection spectra of electromagnetic radiation from a volume dense packed array of Fe3O4 particles with thicknesses of 3 and 6 mm, and a flat particles array with a set of 15 and 30 layers, as well as frequency characteristics of attenuation of electromagnetic radiation of the claimed materials in the frequency range from 8 to 12.5 GHz obtained. Presented method and the installation have the prospect of being used in the processes of making composite materials for electromagnetic radiation protection using a wide range of materials of micro and nanoparticles.