Ferroelectric ordering and magnetoelectric effect of pristine and Ho-doped orthorhombic DyMnO{sub 3} by dielectric studies
- Laboratoire CRISMAT, ENSICAEN/CNRS UMR 6508, 6 Bd Maréchal Juin, 14050 Caen (France)
In this paper, the magnetoelectric coupling and ferroelectric ordering of the orthorhombic Dy{sub 1-x}Ho{sub x}MnO{sub 3} (x = 0 and 0.1) are studied from the magnetodielectric response of the polycrystalline samples. The dielectric study on the DyMnO{sub 3} reveals ferroelectric transition at 18 K along with an addition transition at 12 K. We suggest that the transition at 12 K could have originated from the polarization flop rather than being the rare earth magnetic ordering. The magnetodielectric study reveals a magnetoelectric coupling strength of 10%, which is stronger by two orders of magnitude in comparison to the hexagonal manganites. Surprisingly, the Ho{sup 3+} substitution in DyMnO{sub 3} suppresses the magnetoelectric coupling strength via the suppression of the spiral magnetic ordering. In addition, it also reduces the antiferromagnetic ordering and ferroelectric ordering temperatures. Overall, the studies show that the rare earth plays an important role in the magnetoelectric coupling strength through the modulation of spiral magnetic structure.
- OSTI ID:
- 22494763
- Journal Information:
- Journal of Applied Physics, Vol. 118, Issue 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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