Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 58: Multiferroics II (organized by MA)
TT 58.7: Vortrag
Mittwoch, 2. April 2014, 11:15–11:30, HSZ 04
Growth and structure characterization of double perovskite Sr2FeMoO6 thin films — •Hakan Deniz1, Dietrich Hesse1, Marin Alexe1, Robert Lowndes2, and Lucian Pintilie2 — 1Max-Planck Institute of Microstructure Physics, Weinberg 2, D-06120, Halle (Saale), Germany — 2National Institute of Materials Physics, Atomistilor 105bis, Magurele 077125, Romania
The double perovskite Sr2FeMoO6 (SFMO) has drawn considerable attention recently owing to some of its unique features such as high Curie temperature (~410K) and half-metallic ferrimagnetic nature with a high saturation moment of 4μB. The low-field room temperature magnetoresistance observed in SFMO makes it an attractive candidate for oxide spintronics applications. However, the broad distribution of results reported so far on SFMO films suggests that an optimal structure is attainable only within a narrow window of growth conditions; and magnetic/transport properties are highly akin to Fe and Mo atomic site disorder. Pulsed laser deposition was employed to grow SFMO thin films on vicinal SrTiO3 substrates from a custom-made stoichiometric target using argon as ambient gas. X-ray diffraction data revealed that the SFMO films were grown epitaxially with respect to the substrate, including, however, a small percentage of secondary phases. The morphology of the films shows flat plains with embedded grain- or needle-like structures, which are most likely the result of spurious phases. The nature of these defects and their interfaces with the SFMO matrix are under investigation by transmission electron microscopy. This work is supported by the EU-FP7 project IFOX.