Regensburg 2010 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 4: Multiferroics I (Joint Session of MA, DF, KR, DS)

DF 4.3: Talk

Monday, March 22, 2010, 11:00–11:15, H3

Magnetoelectric coupling at modified Fe/BaTiO₃ interfaces — •Martin Hölzer¹, Michael Fechner², Sergey Ostanin², and Ingrid Mertig^1,2 — ¹Martin-Luther-Universität Halle-Wittenberg, Fachbereich Physik, D-06900 Halle, Germany — ²Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, D-06120 Halle, Germany

Two-component multiferroics are gaining attention within the last years. These compound materials, consisting of ferromagnetic and ferroelectric layers, combine the advantages (e. g. high curie temperatures) of their components in a tuneable magnetoelectric structure.

Ab initio DFT studies of ultrathin Fe films on ferroelectric BaTiO₃ show that their magnetoelectric coupling can be enhanced considerably by means of interface alloying.

In these systems, the magnetoelectric coupling is related to structural changes in the interface region under polarisation reversal of the BaTiO₃ substrate. In one of the considered cases, a magnetic phase transition with high change in the total magnetization is triggered under polarization reversal.