Critical thickness of ultrathin ferroelectric BaTiO3 films
- 3 March 2005
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 86 (10), 102907
- https://doi.org/10.1063/1.1880443
Abstract
To investigate the critical thickness of ferroelectric (BTO) films, we fabricated fully strained heterostructures on substrates by pulsed laser deposition with in situ reflection high-energy electron diffraction. We varied the BTO layer thickness from . By fabricating capacitors, we could observe polarization versus electric-field hysteresis loops, which demonstrate the existence of ferroelectricity in BTO layers thicker than . This observation provides an experimental upper bound of for the critical thickness. The BTO thickness-dependent scaling of the remanent polarization agrees with the predictions of recent first-principle simulations [J. Junquera and P. Ghosez, Nature 422, 506 (2003)].
Keywords
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