  Specific features of the magnetic properties and magnetic dynamics of
isolated phase separation domains in GdMn2O5 and Gd0.8Ce0.2Mn2O5 have been
investigated. These domains represent 1D superlattices consisting of dielectric
and conducting layers with the ferromagnetic orientation of their spins. A set
of ferromagnetic resonances of separate superlattice layers has been studied.
The properties of the 1D superlattices in GdMn2O5 and Gd0.8Ce0.2Mn2O5 are
compared with the properties of the previously investigated RMn2O5 (R = Eu, Tb,
Er, and Bi) series. The similarity of the properties for all the RMn2O5
compounds with different R ion types is established. Based on the concepts of
the magnetic dynamics of ferromagnetic multilayers and properties of
semiconductor superlattices, a 1D model of the superlattices in RMn2O5 is
built.
