ABSTRACT
At very low temperature (450°C), (111)-oriented and polycrystalline 0.7Pb(Mg1/3Nb2/3) O3-0.3PbTiO3 (PMN-PT) thin films have been grown on platinum (Pt) and lanthium niobate (LaNiO3) bottom electrodes respectively. Macroscopic measurements reveal lower coercive fields for PMN-PT grown on LaNiO3 compared to on platinum, while the piezoelectric coefficient d 33 is greater. At the nanometer scale, local piezoelectric hysteresis loops show that the voltages required for domain switching and piezoelectric response are the highest for PMN-PT deposited on LaNiO3. The electrical results can be explained by taking into account the effects induced by both electrodes on the surface morphology and structural properties of the films.
Acknowledgments
A. F. is grateful to the Nord-Pas de Calais region for its financial support to carry out this work. The authors of LPCIA wish to acknowledge L. Maës for technical support.