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Title: Ferroelectric interaction and polarization studies in BaTiO{sub 3}/SrTiO{sub 3} superlattice

Abstract

Ferroelectric superlattice structures consisting of alternating layers of BaTiO{sub 3} and SrTiO{sub 3} with variable interlayer thickness were grown on Pt (111)/TiO{sub 2}/SiO{sub 2}/Si (100) substrates by pulsed laser deposition. The presence of superlattice reflections in the x-ray diffraction pattern clearly showed the superlattice behavior of the fabricated structures over a range of 6.4-20 nm individual layer thicknesses. Depth profile conducted by secondary ion mass spectrometry analysis showed a periodic concentration of Ba and Sr throughout the film. Polarization hysteresis and the capacitance-voltage characteristics of these films show clear size dependent ferroelectric characteristics. The spontaneous (P{sub s}) and remnant (P{sub r}) polarizations increase gradually with decreasing periodicity, reach a maximum at a finite thickness and then decrease. The competition between the size effect and long-range ferroelectric interaction is suggested as a possible reason for this phenomenon. The temperature dependence of P{sub s} and P{sub r} shows a single ferroelectric phase transition, and the Curie temperature is estimated to be about 316 K. The curve shows that the ferroelectric superlattice tends to form an artificial material, responding as a single structure with an averaged behavior of both the parent systems.

Authors:
;  [1]
  1. Materials Research Center, Indian Institute of Science, Bangalore 560 012 (India)
Publication Date:
OSTI Identifier:
20982900
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 101; Journal Issue: 10; Other Information: DOI: 10.1063/1.2724822; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BARIUM COMPOUNDS; CAPACITANCE; CURIE POINT; ELECTRIC POTENTIAL; ENERGY BEAM DEPOSITION; FERROELECTRIC MATERIALS; LASER RADIATION; MASS SPECTRA; MASS SPECTROSCOPY; PHASE TRANSFORMATIONS; PLATINUM; PULSED IRRADIATION; SILICON OXIDES; STRONTIUM TITANATES; SUPERLATTICES; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; THIN FILMS; TITANIUM OXIDES; X-RAY DIFFRACTION

Citation Formats

Sarkar, Asis, and Krupanidhi, S. B.. Ferroelectric interaction and polarization studies in BaTiO{sub 3}/SrTiO{sub 3} superlattice. United States: N. p., 2007. Web. doi:10.1063/1.2724822.
Sarkar, Asis, & Krupanidhi, S. B.. Ferroelectric interaction and polarization studies in BaTiO{sub 3}/SrTiO{sub 3} superlattice. United States. doi:10.1063/1.2724822.
Sarkar, Asis, and Krupanidhi, S. B.. Tue . "Ferroelectric interaction and polarization studies in BaTiO{sub 3}/SrTiO{sub 3} superlattice". United States. doi:10.1063/1.2724822.
@article{osti_20982900,
title = {Ferroelectric interaction and polarization studies in BaTiO{sub 3}/SrTiO{sub 3} superlattice},
author = {Sarkar, Asis and Krupanidhi, S. B.},
abstractNote = {Ferroelectric superlattice structures consisting of alternating layers of BaTiO{sub 3} and SrTiO{sub 3} with variable interlayer thickness were grown on Pt (111)/TiO{sub 2}/SiO{sub 2}/Si (100) substrates by pulsed laser deposition. The presence of superlattice reflections in the x-ray diffraction pattern clearly showed the superlattice behavior of the fabricated structures over a range of 6.4-20 nm individual layer thicknesses. Depth profile conducted by secondary ion mass spectrometry analysis showed a periodic concentration of Ba and Sr throughout the film. Polarization hysteresis and the capacitance-voltage characteristics of these films show clear size dependent ferroelectric characteristics. The spontaneous (P{sub s}) and remnant (P{sub r}) polarizations increase gradually with decreasing periodicity, reach a maximum at a finite thickness and then decrease. The competition between the size effect and long-range ferroelectric interaction is suggested as a possible reason for this phenomenon. The temperature dependence of P{sub s} and P{sub r} shows a single ferroelectric phase transition, and the Curie temperature is estimated to be about 316 K. The curve shows that the ferroelectric superlattice tends to form an artificial material, responding as a single structure with an averaged behavior of both the parent systems.},
doi = {10.1063/1.2724822},
journal = {Journal of Applied Physics},
number = 10,
volume = 101,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}