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The electric polarization and its magnetic origins in multiferroic RMn2O5,where R is rare-earth ion, are still issues under debate. In this work, thetemperature-dependent electric polarization of DyMn2O5, the most attractivemember of this RMn2O5 family, is investigated using the pyroelectric currentmethod upon varying endpoint temperature of the electric cooling, plus thepositive-up-negative-down (PUND) technique. It is revealed that DyMn2O5 at lowtemperature does exhibit the unusual ferrielectricity rather thanferroelectricity, characterized by two interactive and anti-parallelferroelectric sublattices which show different temperature-dependences. The twoferroelectric sublattices are believed to be generated from the symmetricexchange-striction mechanisms associated with the Mn-Mn spin interactions andDy-Mn spin interactions, respectively. The path-dependent electric polarizationreflects the first-order magnetic transitions in the low temperature regime.The magnetoelectric effect is mainly attributed to the Dy spin order which issensitive to magnetic field. The present experiments may be helpful forclarifying the puzzling issues on the multiferroicity in DyMn2O5 and probablyother RMn2O5 multiferroics.

Experimental observation of ferrielectricity in multiferroic DyMn2O5: revisiting the electric polarization