The multiferroic RMn 2 O 5 family, where R is rare-earth ion or Y, exhibits rich physics of multiferroicity which has not yet well understood, noting that multiferroicity is receiving attentions for promising application potentials. DyMn 2 O 5 is a representative member of this family. The ferroelectric polarization in DyMn 2 O 5 is claimed to have two anti-parallel components: one (P DM ) from the symmetric exchange striction between the Dy 3+ -Mn 4+ interactions and the other (P MM ) from the symmetric exchange striction between the Mn 3+ -Mn 4+ interactions. We investigate the evolutions of the two components upon a partial substitution of Mn 3+ by nonmagnetic Al 3+ in order to tailor the Mn-Mn interactions and then to modulate component P MM in DyMn 2-x/2 Al x/2 O 5 . It is revealed that the ferroelectric polarization can be successfully reversed by the Al-substitution via substantially suppressing the Mn 3+ -Mn 4+ interactions and thus the P MM . The Dy 3+ -Mn 4+ interactions and the polarization component P DM can sustain against the substitution until a level as high as x=0.2. In addition, the independent Dy spin ordering is shifted remarkably down to an extremely low temperature due to the Al 3+ substitution. The present work not only confirms the existence of the two anti-parallel polarization components but also unveils the possibility of tailoring them independently.
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