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The ac field dependence of dielectric and piezoelectric response of sol-gel derived Pb(Zr,Ti)O(3)thin films is presented. The nonlinear response of dielectric polarisation and piezoelectrically induced strain at sub-switching fields was studied in terms of amplitude and phase angle of first and third harmonic. The experimental results have shown that a description by a classical polynomial approach cannot account for many features of observed behavior. However, a model based on the pinning of domain walls on randomly distributed pinning centers seems to describe many features of the experimental data.
Nava Setter, Nicola Marzari, Dragan Damjanovic, Alberto Biancoli, David Bahati
Nava Setter, Alexander Tagantsev