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Enhancement of remanent polarization in epitaxial BaTiO3/SrTiO3 superlattices with "asymmetric" structure

J. Appl. Phys. 91, 2290 (2002); doi:10.1063/1.1434547

Issue Date: 15 February 2002

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Toru Shimuta, Osamu Nakagawara, Takahiro Makino, and Seiichi Arai
Murata Manufacturing Company, Ltd., 2-26-10 Tenjin, Nagaokakyo, Kyoto 617-8555, Japan

Hitoshi Tabata and Tomoji Kawai
The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan
Enhancement of remanent polarization has been demonstrated in epitaxial "asymmetric" BaTiO3/SrTiO3 strained superlattices, in which the thickness ratio of BaTiO3 to SrTiO3 layers is changed at molecular layer order accuracy. The superlattices have been prepared on Nb-doped SrTiO3 (100) single-crystal substrates by a pulsed-laser deposition technique. The superlattice with a stacking periodicity of 15 unit cells BaTiO3/3 unit cells SrTiO3 shows the largest remanent polarization 2Pr of 46 µC/cm2, which is about three times that of the BaTiO3 single-phase film formed under the same condition. The increase in the remanent polarization is attributed both to the BaTiO3-rich structure and to the increase in lattice parameter c due to the mismatch of in-plane lattice parameters between BaTiO3 and SrTiO3. ©2002 American Institute of Physics.
History: Received 28 June 2001; accepted 19 November 2001
Permalink: http://link.aip.org/link/?JAPIAU/91/2290/1
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KEYWORDS and PACS

Keywords
PACS
  • 77.22.Ej
    Dielectrics, piezoelectrics, and ferroelectrics and their properties Dielectric properties of solids and liquids Polarization and depolarization
  • 77.84.Dy
    Dielectrics, piezoelectrics, and ferroelectrics and their properties Dielectric, piezoelectric, ferroelectric, and antiferroelectric materials Niobates, titanates, tantalates, PZT ceramics, etc.
  • 81.05.Je
    Materials science Specific materials: fabrication, treatment, testing and analysis Ceramics and refractories (including borides, carbides, hydrides, nitrides, oxides, and silicides)
  • 77.55.+f
    Dielectrics, piezoelectrics, and ferroelectrics and their properties Dielectric thin films
  • 68.65.Cd
    Surfaces and interfaces; thin films and low-dimensional systems (structure and nonelectronic properties) Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties Superlattices
  • 77.80.-e
    Dielectrics, piezoelectrics, and ferroelectrics and their properties Ferroelectricity and antiferroelectricity
  • YEAR: 2002

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ISSN:
0021-8979 (print)   1089-7550 (online)
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