Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 21: Poster I

MA 21.11: Poster

Tuesday, March 13, 2018, 09:30–13:00, Poster A

Interfacial ferromagnetism in LaMnO₃/SrMnO₃ superlattices — •Jan Philipp Bange¹, Marius Keunecke¹, Vladimir Roddatis², and Vasily Moshnyaga¹ — ¹Erstes Physikalisches Institut, Georg-August-Universität-Göttingen, Germany — ²Institut für Materialphysik, Georg-August-Universität-Göttingen, Germany

Transition-metal-oxide perovskite heterostructures show unusual electrical and magnetic properties originated from the so called “emergent phases” at the interfaces [1]. Their behaviour is shown to be governed by interfacial charge transfer, driven by polar mismatch and orbital reconstruction, which can be as well influenced by epitaxy stress. The metalorganic aerosol deposition (MAD) technique was employed to grow digital [(SrMnO₃)_n/(LaMnO₃)_m]₁₀ superlattices (SL) on SrTiO₃(100) substrates with layer thicknesses n,m=3,4,5,6 u.c. Structural characterization reveals chemically sharp and symmetric interfaces as well as atomically smooth surface morphology. A complex magnetic behaviour with coexisting high- and low-temperature ferromagnetic phases with T_C,1=270-350 K and T_C,2=150-280 K, respectively, was observed and assigned to the interfacial (T_C,1) and LMO-like (T_C,2) contributions. Magnetic properties were found to be controlled by the SL design, i.e. by the SMO/LMO thickness ratio (n/n+m), thus, pointing out the importance of crystal structure and MnO₆ octahedral distortions onto the manifestation of the emergent high-T_C interfacial magnetism. [1] Hwang, H.Y., Iwasa, Y., Kawasaki, M., Keimer, B., Nagaosa, N. and Tokura, Y. “Emergent phenomena at oxide interfaces” Nat. Mater. 11, 103 (2012).