Berlin 2018 – scientific programme

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DS: Fachverband Dünne Schichten

DS 17: Poster Session I

DS 17.44: Poster

Tuesday, March 13, 2018, 18:15–20:15, Poster B

Antiferromagnetic interfaces in ferromagnetic perovskite heterostructures — •Vitaly Bruchmann-Bamberg and Vasily Moshnyaga — I. Physik. Institut, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen

The magnetism in strongly correlated oxide perovskites, e.g. manganites La_0.7Sr_0.3MnO₃ (LSMO), is well-known to be governed by indirect super- or double-exchange mechanism via oxygen p-states. A ferromagnetic (FM) or an antiferromagnetic (AFM) ground state evolves, depending on the configuration and occupancy of d-orbitals. An unusual AFM coupling at the interface between two FM perovskites, i.e. a metallic LSMO (T_C,LSMO=350 K) and an insulating double perovskite La₂CoMnO₆ (LMCO) (T_C,LMCO=230 K), was observed. The LSMO/LMCO heterostructures were grown on (100)- and (111)-oriented SrTiO₃ substrates by metalorganic aerosol deposition technique. The interfacial AFM coupling appears for T<T_C,LMCO=230 K and is maximal in (001)-oriented heterostructures. The role of termination layers at LSMO/LMCO interfaces on the exchange mechanisms is discussed within Goodenough-Kanamori-Anderson rules of magnetic couplings.