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Ferroelectricity and Self-Polarization in Ultrathin Relaxor Ferroelectric Films.


ABSTRACT: We report ferroelectricity and self-polarization in the (001) oriented ultrathin relaxor ferroelectric PMN-PT films grown on Nb-SrTiO3, SrRuO3 and La0.7Sr0.3MnO3, respectively. Resistance-voltage measurements and AC impedance analysis suggest that at high temperatures Schottky depletion width in a 4 nm thick PMN-PT film deposited on Nb-SrTiO3 is smaller than the film thickness. We propose that Schottky interfacial dipoles make the dipoles of the nanometer-sized polar nanoregions (PNRs) in PMN-PT films grown on Nb-SrTiO3 point downward at high temperatures and lead to the self-polarization at room temperature with the assistance of in-plane compressive strain. This work sheds light on the understanding of epitaxial strain effects on relaxor ferroelectric films and self-polarization mechanism.

SUBMITTER: Miao P 

PROVIDER: S-EPMC4730210 | biostudies-literature | 2016 Jan

REPOSITORIES: biostudies-literature

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Ferroelectricity and Self-Polarization in Ultrathin Relaxor Ferroelectric Films.

Miao Peixian P   Zhao Yonggang Y   Luo Nengneng N   Zhao Diyang D   Chen Aitian A   Sun Zhong Z   Guo Meiqi M   Zhu Meihong M   Zhang Huiyun H   Li Qiang Q  

Scientific reports 20160128


We report ferroelectricity and self-polarization in the (001) oriented ultrathin relaxor ferroelectric PMN-PT films grown on Nb-SrTiO3, SrRuO3 and La0.7Sr0.3MnO3, respectively. Resistance-voltage measurements and AC impedance analysis suggest that at high temperatures Schottky depletion width in a 4 nm thick PMN-PT film deposited on Nb-SrTiO3 is smaller than the film thickness. We propose that Schottky interfacial dipoles make the dipoles of the nanometer-sized polar nanoregions (PNRs) in PMN-PT  ...[more]

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