A radical approach to promote multiferroic coupling in double perovskites


Double perovskites provide a unique opportunity to induce and control multiferroic behaviours in oxide systems. The appealing possibility to design materials with a strong coupling between the magnetization and the polarization fields may be achieved in this family since these magnetic insulators can present structural self-ordering in the appropriate growth conditions. We have studied the functional properties of La(2)CoMnO(6) and Bi(2)CoMnO(6) epitaxial thin films grown by pulsed laser deposition. Cation-ordered La(2)CoMnO(6) films display a magnetic Curie temperature of 250 K while cation-disordered Bi(2)CoMnO(6) films present ferromagnetism up to similar to 800 K. Such high transition temperature for magnetic ordering can be further tuned by varying the strain in the films indicating an important contribution from the structural characteristics of the materials. Our approach might be generalized for other oxide systems. At this end, our results are compared with other multiferroic systems. The roles of various cations, their arrangements and structural effects are further discussed. (C) 2009 Elsevier B.V. All rights reserved.




Materials Science; Physics


Singh, MP; Truong, KD; Fournier, P; Rauwel, P; Rauwel, E; Carignan, LP; Menard, D


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