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The multiferroic RMn2O5 family, where R is rare-earth ion or Y, exhibits richphysics of multiferroicity which has not yet well understood, noting thatmultiferroicity is receiving attentions for promising application potentials.DyMn2O5 is a representative member of this family. The ferroelectricpolarization in DyMn2O5 is claimed to have two anti-parallel components: one(PDM) from the symmetric exchange striction between the Dy3+-Mn4+ interactionsand the other (PMM) from the symmetric exchange striction between the Mn3+-Mn4+interactions. We investigate the evolutions of the two components upon apartial substitution of Mn3+ by nonmagnetic Al3+ in order to tailor the Mn-Mninteractions and then to modulate component PMM in DyMn2-x/2Alx/2O5. It isrevealed that the ferroelectric polarization can be successfully reversed bythe Al-substitution via substantially suppressing the Mn3+-Mn4+ interactionsand thus the PMM. The Dy3+-Mn4+ interactions and the polarization component PDMcan sustain against the substitution until a level as high as x=0.2. Inaddition, the independent Dy spin ordering is shifted remarkably down to anextremely low temperature due to the Al3+ substitution. The present work notonly confirms the existence of the two anti-parallel polarization componentsbut also unveils the possibility of tailoring them independently.

Reversing ferroelectric polarization in multiferroic DyMn2O5 by nonmagnetic Al substitution of Mn