Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 55: Poster II
MA 55.1: Poster
Freitag, 4. April 2014, 10:30–13:30, P2
Ferroelectric and magnetic properties of doped BiFeO3 and BiFeO3/BaTiO3 composite and multilayer thin films — •Peter Schwinkendorf1, Michael Lorenz1, Vera Lazenka2, Holger Hochmuth1, and Marius Grundmann1 — 1Universität Leipzig, Institut für Experimentelle Physik II, Linnéstraße 5, 04103 Leipzig — 2Institute for Nanoscale Physics and Chemistry, KU Leuven
BiFeO3 is to date the most widely studied single phase material concerning potential application as multiferroic in the development of upcoming new computer memory technologies. This is due to its unique combination of room temperature ferroelectricity (polarization values of up to 60 C cm−2) and ferromagnetism [1].
However, single phase BiFeO3 films often suffer from high leakage currents. In order to overcome this problem and possibly modify the basic ferroelectric and magnetic properties we show here multiferroic composite thin films and multilayers consisting of BiFeO3 and BaTiO3 as well as doping of BiFeO3 films with rare earth ions [2].
As expected, an increasing BaTiO3 content in the samples decreases the leakage current but maintains a high ferroelectric polarization. We furthermore found that multilayers exhibit considerably enhanced magnetic properties compared to single phase films. The same is observed for Gd-doped films while La-doping causes smoothening of the film surface [2]. Magnetoelectric coupling in the composites was investigated via two different methods.
[1] J. Wang, Science 299, 1719 (2003)
[2] V. Lazenka, J. Phys. D: Appl. Phys. 46 175006 (2013)