Double perovskites provide a unique opportunity to induce and controlmultiferroic behaviors in oxide systems. The appealing possibility to designmaterials with a strong coupling between the magnetization and the polarizationfields may be achieved in this family since these magnetic insulators canpresent structural self-ordering in the appropriate growth conditions. We havestudied the functional properties of La2CoMnO6 and Bi2CoMnO6 epitaxial thinfilms grown by pulsed laser deposition. Cation-ordered La2CoMnO6 films displaya magnetic Curie temperature of 250 K while cation-disordered Bi2CoMnO6 filmspresent ferromagnetism up to ~ 800 K. Such high transition temperature formagnetic ordering can be further tuned by varying the strain in the filmsindicating an important contribution from the structural characteristics of thematerials. Our approach might be generalized for other oxide systems. At thisend, our results are compared with other multiferroic systems. The roles ofvarious cations, their arrangements and structural effects are furtherdiscussed.
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