Tuning the atomic and domain structure of epitaxial films of multiferroic BiFeO3

Details Tuning the atomic and domain structure of epitaxial films of multiferroic BiFeO3 Tuning the atomic and domain structure of epitaxial films of multiferroic BiFeO3

2009-11-23

arxiv.org/abs/0911.4502v1

Physics

Condensed Matter

Materials Science

RevTeX; 4 two-column pages; 4 color figures. Figure 2b does not seem to display well. A proper version can be found in the sou

Scientific paper

Recent works have shown that the domain walls of room-temperature multiferroic BiFeO3 (BFO) thin films can display distinct and promising functionalities. It is thus important to understand the mechanisms underlying domain formation in these films. High-resolution x-ray diffraction and piezo-force microscopy, combined with first-principles simulations, have allowed us to characterize both the atomic and domain structure of BFO films grown under compressive strain on (001)-SrTiO3, as a function of thickness. We derive a twining model that describes the experimental observations and explains why the 71o domain walls are the ones commonly observed in these films. This understanding provides us with a new degree of freedom to control the structure and, thus, the properties of BiFeO3 thin films.

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