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DS: Fachverband Dünne Schichten
DS 36: Postersession I
DS 36.26: Poster
Wednesday, March 22, 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 αME 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 (Bi1.1FeO3), as well as targets doped with Gd (Bi1−xGdxFeO3). 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).