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TT: Fachverband Tiefe Temperaturen

TT 2: Multiferroics 1 (jointly with DF, DS, KR, and MA)

TT 2.1: Vortrag

Montag, 11. März 2013, 09:30–09:45, H3

Magnetoelectric coupling at the n-doped interface BaTiO₃/SrTcO₃ studied from first principles — •Vladislav Borisov¹, Sergey Ostanin¹, and Ingrid Mertig^1,2 — ¹Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany — ²Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, D-06099 Halle, Germany

Antiferromagnetically induced magnetoelectric coupling at the interface BaTiO₃/SrTcO₃, which combines a robust ferroelectric and a stable antiferromagnetic perovskite, is studied from first principles. For the BaO/TcO₂-terminated interface, the magnetic order may change from G- to C-type antiferromagnetism upon the electric polarization reversal in the ferroelectric side. By inspecting the two-dimensional band structure and orbital occupation of the Tc 4d-states we conclude that the polarization-dependent charge transfer is responsible for a two-dimensional electron gas at the interface between two insulating perovskites. The case of paraelectric BaTiO₃ is also discussed in the context of the effect.