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MA: Fachverband Magnetismus

MA 15: Multiferroics II: Strain and Composites (jointly with DF, DS, KR, TT)

MA 15.4: Vortrag

Montag, 14. März 2011, 17:45–18:00, HSZ 04

Fabrication and multiferroic properties of BiFeO₃/BiCrO₃ perovskite heterostructures — •Vijayanandhini Kannan, Florian Johann, Alessio Morelli, Miryam Arredondo, Eckhard Pippel, and Ionela Vrejoiu — Max Planck Institute of Microstructure Physics, Weinberg 2, D-06120 Halle.

Bi-based multiferroic materials have attracted strong research interests due to the presence of sterochemical active 6s² lone pair electrons in Bi³⁺ ions and high ordering temperatures, e.g., BiMeO₃ (Me = Fe, Cr, Mn, etc). In the present work, epitaxial films of BiCrO₃ and BiFeO₃ of different thickness (5 nm to 250 nm) were grown on SrTiO₃ (100) using pulsed laser deposition technique. Reciprocal space mapping XRD measurements showed that both BiFeO₃ (40 nm) and BiCrO₃ films (130 nm) are fully strained, having out-of-plane lattice constants of 4.075 Å, and 3.88 Å, respectively. The transmission electron microscopy (TEM) analysis of BiCrO₃(130nm)/SrRuO₃(16nm)/SrTiO₃ films revealed the presence of 45^o and 90^o domains along with the coexistence of three structurally different phases, (i) monoclinic (Space Group: C2/c) and (ii) orthorhombic (Space Group: Pnma) and (iii) an unknown monoclinic-like structure. BiCrO₃ film (160 nm) grown on NdGaO₃ (110) showed a coherent interface without any misfit dislocations or structural variants. A systematic approach on understanding the thickness evolution of these defects or strain induced structural variants of BiCrO₃/SrRuO₃/SrTiO₃ films is done. Furthermore, the fabrication and multiferroic properties of BiCrO₃/BiFeO₃ bilayers and multilayer heterostructures are investigated.