Ferroelectricity in ultra-thin perovskite films

Abstract

We report studies of ferroelectricity in ultra-thin perovskite films with realistic electrodes. The results reveal stable ferroelectric states in thin films less than 10 Åthick with polarization normal to the surface. Under short-circuit boundary conditions, the screening effect of realistic electrodes and the influence of real metal/oxide interfaces on thin film polarization are investigated. Our studies indicate that metallic screening from the electrodes is affected by the difference in work functions at oxide surfaces. We demonstrate this effect in ferroelectric PbTiO${}_3$ and BaTiO${}_3$ films.

4 pages in REVTEX4, 4 epsf figures

References in corpus (4)

• Ab initio study of BaTiO3 and PbTiO3 surfaces in external electric fields
• Ferroelectricity and tetragonality in ultrathin PbTiO3 films
• A Microscopic Model of Ferroelectricity in Stress-free PbTiO3 Ultrathin Films
• Properties of Pb(Zr,Ti)O${}_3$ ultrathin films under stress-free and open-circuit electrical boundary conditions

Cited by in corpus (50)

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• Kinetic control of ferroelectricity in ultrathin epitaxial Barium Titanate capacitors