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Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

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

MA 2.1: Talk

Monday, March 11, 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 Mertig1,21Max-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.

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