Abstract
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.
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