Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.42: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Investigation of 3d-5d double perovskites as potential room temperature multiferroics — •Ashish Kulkarni1,2, Vikas Shabadi1, Philipp Komissinskiy1, Rajeev Gupta2,3, and Lambert Alff1 — 1Institute of Materials Science, Technische Universität Darmstadt, Alarich-Weiss-Strasse 2, 64287 Darmstadt, Germany — 2Materials Science Programme, Indian Institute of Technology Kanpur, 208016 Kanpur, India — 3Department of Physics, Indian Institute of Technology Kanpur, 208016 Kanpur, India
In the search for multiferroic materials with ferromagnetic and ferroelectric order in a single phase, the A2BB′O6 double perovskites hold the potential for room-temperature functionality. The fabrication challenge with these multi-cation complex oxides lies in the precise control of oxidation states of the elements and achieving a high degree of B-site chemical order. Based on recent theoretical investigations to identify potential ferromagnetic insulators among 3d-5d double perovskites, the compound Bi2MnReO6 was predicted to have magnetic ordering temperatures well above 300 K. We report on the fabrication of epitaxial thin films of the analogous novel compound La2MnReO6 on single crystal SrTiO3 (001) substrates, using pulsed laser deposition. Given the specific configuration of the outer electronic shells and the 150∘ Mn-O-Re bond angle, the magnetic moments on Mn and Re are expected to be coupled via superexchange in a ferrimagnetic state. Detailed structural investigations were performed by X-ray diffraction and the magnetic properties were studied by SQUID magnetometry.