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Title: A study of magnetic ordering in multiferroic hexagonal Ho{sub 1-x}Dy{sub x}MnO{sub 3}

This paper investigates the magnetic properties of Ho{sub 1-x}Dy{sub x}MnO{sub 3} by considering the inter-planar Mn{sup 3+}-O-O-Mn{sup 3+} interaction. The theoretical analysis shows that the asymmetric in-plane exchange interaction couples the in-plane and inter-planar Mn{sup 3+} spin structures via asymmetry parameter δ. This leads to the existence of both the in-plane and inter-planar ordering, which in turn restricted the allowed magnetic space groups to Γ{sub 1} and Γ{sub 4}. The experimental studies confirmed the concomitant nature of the in-plane and the inter-planar ordering at T{sub N}, T{sub SR}, and T{sub 2}. It also showed that the magnetic phase diagram is dominated by the allowed magnetic structures Γ{sub 1} and Γ{sub 4}. Furthermore, an effort is made to resolve the inconsistency regarding the T{sub SR} (32 or 40 K). The studies revealed that the antiferromagnetic inter-planar interaction is switched to the ferromagnetic interaction (40 K) upon cooling, which in turn drives the spin reorientation at 32 K. The Mn{sup 3+} spin structure is seen to be coupled to rare earth sub-lattice through the modulation of the inter-planar interaction.
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Department of Physics, Indian Institute of Technology Madras, Chennai 600036 (India)
  2. Cryogenic Engineering Centre, Indian Institute of Technology Kharagpur, Kharagpur 721302 (India)
  3. Laboratoire CRISMAT, ENSICAEN, CNRS UMR 6508, 6 Bd Maréchal Juin, 14050 Caen (France)
Publication Date:
OSTI Identifier:
22413131
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 117; 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:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ANTIFERROMAGNETISM; CONCENTRATION RATIO; DYSPROSIUM COMPOUNDS; EXCHANGE INTERACTIONS; HOLMIUM COMPOUNDS; MAGNETIC PROPERTIES; MAGNETIZATION; MANGANATES; MANGANESE IONS; MODULATION; PHASE DIAGRAMS; SPIN; TEMPERATURE DEPENDENCE