Phase transitions and phase transformations in the phase separation nanoregions in ErMn$_{2}$O$_{5}$ multiferroics

The effect of the rare-earth ion Er$^{3+}$, which has a large orbital contribution to the magnetic moment, were studied to phase transitions and phase transformations of 2D nanoregions of phase separation in the ErMn$_{2}$O$_{5}$ multiferroic. These nanoregions are the semiconductor heterostructures (superlattices) and are formed due to self-organization processes in the ErMn$_{2}$O$_{5}$ matrix. Significant effect of Er$^{3+}$ ions, the moments of which are rigidly oriented along the c axis of the crystal, on the magnetic dynamics, heat capacity and multiferroic properties of layers superlattises was found at a wide temperature range 5 K–300 K in ErMn$_{2}$O$_{5}$ multiferroics.