Publication Type:Journal Article
Source:Applied Physics Letters, Volume 90, Number 25 (2007)
Keywords:bismuth compounds, crystal structure, Epitaxial films, Ferroelectric films, Ferroelectric size effects, ferroelectricity, Monoclinic phases, Piezoforce microscopy, Polarization, transmission electron microscopy
Ferroelectric size effects in multiferroic BiFeO3 have been studied using a host of complementary measurements. The structure of such epitaxial films has been investigated using atomic force microscopy, transmission electron microscopy, and x-ray diffraction. The crystal structure of the films has been identified as a monoclinic phase, which suggests that the polarization direction is close to (111). Such behavior has also been confirmed by piezoforce microscopy measurements. That also reveals that the ferroelectricity is down to at least 2 nm.©2007 American Institute of Physics.
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