Dresden 2017 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 36: Postersession I

DS 36.26: Poster

Mittwoch, 22. März 2017, 17:00–19:00, P2-EG

Effect of Bi-content and Gd-doping on the multiferroic properties of BaTiO₃-BiFeO₃ superlattices — •Stefan Hohenberger¹, Michael Lorenz¹, Vera Lazenka², and Marius Grundmann¹ — ¹Institut für Experimentelle Physik II, Universität Leipzig, D-04103 Leipzig, Germany — ²Instituut voor Kern- en Stralingsfysica, KU Leuven, B-3001 Leuven, Belgium

Epitaxial superlattices consisting of BaTiO₃-BiFeO₃ double layers show vastly improved magnetoelectric (ME) voltage coefficients α_ME of up to 49 V cm⁻¹ Oe⁻¹ [1], compared with single-phase BiFeO₃ films. The microscopic origins of this enhanced ME coupling, however, are currently not fully understood. A series of films were prepared by pulsed laser deposition on SrTiO₃ substrates using BiFeO₃ targets with overstochiometric Bi-content (Bi_1.1FeO₃), as well as targets doped with Gd (Bi_1−xGd_xFeO₃). These modifications have shown to increase the ferromagnetic and ferroelectric properties in single phase BiFeO₃ films.

The samples were studied with a vibrating sample magnetometer in a magnetocryostat at 10 K and 300 K. Ferroelectric polarization hysteresis measurements were carried out with a thin film analyzer. Furthermore, piezo-force microscopy was carried out. The results show the impact of chemical composition and rare earth doping on the multiferroic performance of oxide superlattices.

[1] M. Lorenz, V. Lazenka, P. Schwinkendorf, M. J. Van Bael, A. Vantomme, K. Temst, M. Grundmann, T. Höche, Adv. Mater. Interfaces 3, 11 (2016).