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Title: Ferroelectric ordering and magnetoelectric effect of pristine and Ho-doped orthorhombic DyMnO{sub 3} by dielectric studies

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.
Authors:
;  [1] ; ; ; ;  [2]
  1. Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)
  2. Laboratoire CRISMAT, ENSICAEN/CNRS UMR 6508, 6 Bd Maréchal Juin, 14050 Caen (France)
Publication Date:
OSTI Identifier:
22494763
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; DOPED MATERIALS; ELECTRICAL PROPERTIES; FERROELECTRIC MATERIALS; HOLMIUM IONS; MAGNETIC PROPERTIES; MAGNETIZATION; MODULATION; ORTHORHOMBIC LATTICES; POLARIZATION; POLYCRYSTALS; RARE EARTHS