Electomagnetic absorption of composites based on epoxy resin and metallic iron nanoparticles Roman V. Krekhno, Alexander P. Safronov, Anna I. Beketova and Igor V. Beketov EPJ Web Conf., 185 (2018) 04025 Published online: 04 July 2018 DOI: 10.1051/epjconf/201818504025