Regensburg 2019 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetism Poster A

MA 15.75: Poster

Tuesday, April 2, 2019, 10:00–13:00, Poster E

Ferromagnetism in LaMnO₃/SrMnO₃ superlattices: role of structural layout — •Robert Gruhl¹, Vitaly Bruchmann-Bamberg¹, Jan Philipp Bange¹, Vladimir Roddatis², and Vasily Moshnyaga¹ — ¹I. Physikalisches Institut, Georg-August-Universität Göttingen, Germany — ²Institut für Materialphysik, Georg-August-Universität Göttingen, Germany

Interfaces in the heterostructures of transition metal oxides show unique properties which cannot be observed in the constituent bulk materials. The prominent example is a 2D electron gas in LaAlO₃/SrTiO₃. These emergent interfacial phenomena are believed to arise due to the complex charge, spin and orbital reconstructions at the interfaces. Superlattices (SLs) of LaMnO₃ (LMO) and SrMnO₃ (SMO) were prepared on SrTiO₃(100) substrates using the metalorganic aerosol deposition. The growth, controlled in-situ by optical ellipsometry, results in superlattices with flat and chemically sharp interfaces as well as in an atomically smooth surface morphology. The prepared SLs, composed from two antiferromagnets, show complex magnetic behavior with high- and low-temperature ferromagnetic phases. Samples with a constant bilayer and total thickness but with varying thicknesses of LMO and SMO were studied to determine the mutual influence of the LMO/SMO thicknesses on the interfacial magnetic properties as well as on the magnetism of the whole superlattice. Financial support of the Deutsche Forschungsgemeinschaft via SFB 1073 TP A02 is acknowledged.