Method of Absorbing Material Formation Based on Magnetically Controlled Particles of Fe3O4

A method of formation of three-dimensional arrays of magnetically controlled particles from iron oxide Fe3O4 using a rotating permanent magnetic field is developed to create a material that absorbs electromagnetic radiation in the microwave range. The use of laboratory setup with a rotating magnetic field of permanent magnets makes it possible to obtain a composite with a close packing of particles, in which the principle of self-organization of monolayers of magnetic particles is realized. The reflection spectra, absorption spectra, and attenuation spectra of the electromagnetic radiation of composites with a three-dimensional array of close-packed magnetic particles of Fe3O4 with a thickness of 3 mm and 6 mm consisting of 15 and 30 flat monolayers of particles, respectively, are obtained. The technique for three-dimensional arrays of magnetic particles of Fe3O4 and the laboratory setup for its implementation are promising to produce composite materials using a wide range of microparticles and nanoparticles.