Effect of epitaxial strain on ferroelectric polarization in multiferroic BiFeO3 films

Details Effect of epitaxial strain on ferroelectric polarization in multiferroic BiFeO3 films Effect of epitaxial strain on ferroelectric polarization in multiferroic BiFeO3 films

2007-10-27

arxiv.org/abs/0710.5208v4

Physics

Condensed Matter

Materials Science

Legend in Fig.3 corrected and etc

Scientific paper

10.1063/1.2830799

Multiferroic BiFeO3 epitaxial films with thickness ranging from 40 nm to 960 nm were grown by pulsed laser deposition on SrTiO3 (001) substrates with SrRuO3 bottom electrodes. X-ray characterization shows that the structure evolves from angularly-distorted tetragonal with c/a ~ 1.04 to more bulk-like distorted rhombohedral (c/a ~ 1.01) as the strain relaxes with increasing thickness. Despite this significant structural evolution, the ferroelectric polarization along the body diagonal of the distorted pseudo-cubic unit cells, as calculated from measurements along the normal direction, barely changes.

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