Comparing macroscopic and microscopic properties of seeded ferroelectric thin films
authors Wu, AY; Gonzalez-Aguilar, G; Vilarinho, PM; Salvado, IMM; Costa, MEV
nationality International
author keywords Ferroelectric thin films; Seeding; Local piezoelectric properties; PZT; SBT
abstract The comparison of macroscopic and microscopic properties of ferroelectric thin films in the systems of lead zirconate titanate (PZT) and strontium bismuth tantalate (SBT) with and without seeds is carried out. Microscopic properties were studied by piezo-response force microscopy (PFM). The local piezoelectric properties with and without seeds are compared with their macroscopic electric properties measured by conventional techniques. Previous microstructure analysis of PZT thin films showed that an intermetallic Pt(x)Pb layer between PZT and Pt, formed during the annealing process, was reduced and even eliminated in seeded PZT films. In SBT films, the addition of SBT seeds suppressed the interdiffusion of Pt and film components. Hence, the interfaces of PZT/substrate and SBT/substrate are modified by the presence of seeds, and their electrical properties are improved. In both PZT and SBT films, the remanent polarization values are higher in seeded films than in unseeded ones. Similarly, local piezo-response signal of single grain showed higher longitudinal piezoelectric coefficient d(33) in seeded films than in unseeded ones. The critical voltage in which the ferroelectric domain starts to switch is lower in seeded films than in unseeded ones. The analysis of nanoscale switching in PZT and SBT films by PFM is presented and related to the corresponding macroscopic electric properties.
publisher SPRINGER
issn 1385-3449
year published 2008
volume 21
issue 1-4
beginning page 193
ending page 197
digital object identifier (doi) 10.1007/s10832-007-9107-5
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000262833200039
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