Polydomain superlattices composed of ferroelectric PbTiO
3
and paraelectric SrTiO
3
were investigated by means of temperature-dependent X-ray diffraction and electrical measurements. The ...ferroelectric nanodomains were found to have an almost isotropic distribution of domain wall alignments and to be highly responsive to applied electric fields, giving rise to large enhancements in the overall dielectric response of the structure. Electrical measurements revealed a dramatic dependence of the dielectric permittivity, tunability, and polarization-voltage characteristics on the superlattice period. For short-period superlattices, double hysteresis loops were observed.
Full hemispherical X-ray photoelectron diffraction (XPD) experiments have been performed to investigate at the atomic level ultrathin epitaxial c-axis oriented PbTiO3 (PTO) films grown on Nb-doped ...SrTiO3 substrates. Comparison between experiment and theory allows us to identify a preferential ferroelectric polarization state in a 60 Å -thick PTO film. Multiple scattering theory based on a cluster-model Phys. Rev. B , 075404 (2001) is used to simulate the experiments.
Understanding the behavior of ferroelectrics on the nanoscale level requires the production of materials of the highest quality and advanced characterization techniques for probing the fascinating ...properties of these systems with reduced dimensions. Here we give an overview of our recent achievements in this area, which includes the detailed study of the suppression of ferroelectricity in PbTiO 3 thin films, the fabrication of PbTiO 3 /SrTiO 3 superlattices in which ferroelectricity shows some surprising behavior, and finally the manipulation of nanoscale ferroelectric domains using the atomic force microscope which leads to the precise analysis of domain wall creep and roughness in Pb(Zr,Ti)O 3 thin films
The possibility to manufacture single devices allowing the 10 GHz threshold to be largely overcome has been demonstrated using Electron-beam lithography. In this paper, we propose an original ...alternative to lithographic techniques based on the Focused Ion Beam etching technique to fabricate SAW devices by directly "writing" the electrode pattern in the metal overlay. We also explore the RF capabilities of epitaxial Pb(Zr
0.20
Ti
0.80
)O
3
(PZT) thin films deposited onto SrTiO
3
single crystal substrates. We found that guided waves can be efficiently excited and detected at frequencies ranging from 3 to 5 GHz. Theory/experiment assessment shows a good predictability of the waves characteristics.
The polarization field of the ferroelectric oxide lead zirconate titanate Pb(ZrxTi1-x)O3 was used to tune the critical temperature of the hightemperature superconducting cuprate gadolinium barium ...copper oxide (GdBa2Cu3O7-x) in a reversible, nonvolatile fashion. For slightly underdoped samples, a uniform shift of several Kelvin in the critical temperature was observed, whereas for more underdoped samples, an insulating state was induced. This transition from superconducting to insulating behavior does not involve chemical or crystalline modification of the material.
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