Enhanced ferroelectric polarization by induced Dy spin-order in multiferroic DyMnO3
Abstract
Neutron powder diffraction and single crystal x-ray resonant magnetic scattering measurements suggest that Dy plays an active role in enhancing the ferroelectric polarization in multiferroic DyMnO3 above TNDy = 6.5 K. We observe the evolution of an incommensurate ordering of Dy moments with the same periodicity as the Mn spiral ordering. It closely tracks the evolution of the ferroelectric polarization which reaches a maximum value of 0.2 muC/m2. Below TNDy, where Dy spins order commensurately, the polarization decreases to values similar for those of TbMnO3.
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