Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.43: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Orbital Ordering at the Interfaces in Transition Metal Oxide Heterostructures — •Alexandra Steffen, Artur Glavic, Daniel Schumacher, Jörg Voigt, Alexander Weber, Emmanuel Kentzinger, Ulrich Rücker, and Thomas Brückel — IFF-4, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

In heterostructures of oxide perovskites with the structure ABO₃ orbital ordering can be induced by Jahn-Teller distortions or strain-induced change of the lattice constants, influencing for example the Curie temperature of the compound [1]. The aim of this work is the investigation of orbital ordering in ultrathin layered structures with layer thicknesses below 2 nm.

We prepare multilayers consisting of La_1−xSr_xMnO₃ or La_1−xCa_xMnO₃ (0.2<x<0.5) and SrTiO₃ or BaTiO₃ by high pressure sputtering using an oxygen plasma. Combining ferromagnetic and dielectric resp. ferroelectric layers we expect strong magnetoelectric effects. The structural quality of the layered structures has been confirmed using the x-ray reflectometer and 4-circle diffractometer. With AFM and SQUID magnetometry we have investigated inhomogeneities and magnetization behaviour. In near future, we expect to gain further insights in the ordering phenomena and the interaction between the layers with resonant x-ray diffraction experiments giving access to orbital ordering phenomena and lattice distortions on an atomic length scale.

[1] A. Sadoc et al., Phys. Rev. Lett. 104 046804 (2010)