A study of magnetic ordering in multiferroic hexagonal Ho1-xDyxMnO3

作者：Magesh J; Murugavel P^*; Krishnamurthy J; Adyam V; Prellier W

来源：Journal of Applied Physics, 2015, 117(7): 074104.

DOI：10.1063/1.4913219

This paper investigates the magnetic properties of Ho1-xDyxMnO3 by considering the inter-planar Mn3+-O-O-Mn3+ interaction. The theoretical analysis shows that the asymmetric in-plane exchange interaction couples the in-plane and inter-planar Mn3+ spin structures via asymmetry parameter delta. This leads to the existence of both the in-plane and inter-planar ordering, which in turn restricted the allowed magnetic space groups to Gamma(1) and Gamma(4). The experimental studies confirmed the concomitant nature of the in-plane and the inter-planar ordering at T-N, T-SR, and T-2. It also showed that the magnetic phase diagram is dominated by the allowed magnetic structures Gamma(1) and Gamma(4). Furthermore, an effort is made to resolve the inconsistency regarding the T-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 Mn3+ spin structure is seen to be coupled to rare earth sub-lattice through the modulation of the inter-planar interaction.

• 出版日期2015-2-21