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Coercive field of ultrathin Pb(Zr0.52Ti0.48)O3 epitaxial films

Appl. Phys. Lett. 83, 3356 (2003); doi:10.1063/1.1621731

Issue Date: 20 October 2003

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N. A. Pertsev, J. Rodríguez Contreras, V. G. Kukhar, B. Hermanns, H. Kohlstedt, and R. Waser
Institut für Festkörperforschung, Forschungszentrum Jülich, D-52425 Jülich, Germany
The polarization reversal in single-crystalline ferroelectric films has been investigated experimentally and theoretically. The hysteresis loops were measured for Pb(Zr0.52Ti0.48)O3 films with thicknesses ranging from 8 to 250 nm. These films were grown epitaxially on SrRuO3 bottom electrodes deposited on SrTiO3 substrates. The measurements using Pt top electrodes showed that the coercive field Ec increases drastically as the film becomes thinner, reaching values as high as Ec[approximate]1200  kV/cm. To understand this observation, we calculated the thermodynamic coercive field Eth of a ferroelectric film as a function of the misfit strain Sm in an epitaxial system and showed that Eth strongly depends on Sm. However, the coercive field of ultrathin films, when measured at high frequencies, exceeds the calculated thermodynamic limit. Since this is impossible for an intrinsic coercive field Ec, we conclude that measurements give an apparent Ec rather than the intrinsic one. An enormous increase of apparent coercive field in ultrathin films may be explained by the presence of a conductive nonferroelectric interface layer. ©2003 American Institute of Physics.
History: Received 10 July 2003; accepted 27 August 2003
Permalink: http://link.aip.org/link/?APPLAB/83/3356/1
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KEYWORDS and PACS

Keywords
PACS
  • 77.80.Dj
    Ferroelectric domain structure; hysteresis
  • 77.55.+f
    Dielectric thin films
  • 77.84.Dy
    Dielectric, piezoelectric, and ferroelectric niobates, titanates, tantalates, PZT ceramics, etc
  • 77.22.Ej
    Dielectric polarization and depolarization
  • YEAR: 2003

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ISSN:
0003-6951 (print)   1077-3118 (online)
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REFERENCES (20)
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  20. This value of a0 was chosen based on the measured lattice constants cb and ab of bulk PZT 50/50 ceramics and their electrostrictive constants Qln and polarization Ps = 0.5  C/m2 given in Ref. 16, using the theoretical relations (cb–a0)/a0 = Q11P<sub>s</sub><sup>2</sup> and (ab–a0)/a0 = Q12P<sub>s</sub><sup>2</sup>.

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