Magneto-optical properties of the photon echo: status of research and prospects of applicationI.I. Popov, A.U. Bahadurov, N.S. Vashurin, E.A. Vinogradov, V.O. Kompanets, S.V. Chekalin and S.E. PutilinEPJ Web Conf., 161 (2017) 01010DOI: https://doi.org/10.1051/epjconf/201716101010