Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 14: Poster

DS 14.59: Poster

Dienstag, 2. April 2019, 17:00–20:00, Poster E

Controlling the B-site Ordering by a Layer-by-Layer MAD growth — •Philipp Ksoll¹, Christoph Meyer¹, Vladimier Roddatis², and Vasily Moshneaga¹ — ¹Erstes Physikalisches Institut, Georg-August-Universität Göttingen — ²Institut für Materialphysik, Georg-August-Universität Göttingen

Physical properties of double perovsikte (DP) with general formula A2BB'O6 (A=rare earth or alkaline earth metals; B/B' = Co/Mn, Ni/Mn, Fe/Mo) depend strongly on the degree of B-site ordering. To optimize and control the structure, magnetism and electrical properties we further developed the metalorganic aerosol deposition (MAD) technique to grow DP films in a layer-by-layer (LL) mode under a precise control of chemical composition by in situ optical ellipsometry and oxygen atmosphere during the deposition process. Epitaxial superlattices (ABO3)n/(AB'O3)n (A = La, Sr; B = Ni, Mn, Co, Fe, Mo) with n decreasing down to 1 unit cell to obtain A2BB'O6 have been grown on SrTiO3 and Al2O3 substrates. The films were characterized by global (X-ray diffraction, SQUID, Raman spectroscopy) and local (AFM, TEM) techniques to maintain a full control of the individual layer thickness and to elucidate its influence on the physical properties. Further on, a half-metallic ferromagnetic Sr2FeMoO6 films with transition temperatures well above room temperature, Tc~450 K, have been prepared. Financial support by the DFG via project Mo2255-4 is acknowledged.