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Enhanced piezoelectric response from barium strontium titanate multilayer films

Summary: Enhanced piezoelectric response from barium strontium titanate
multilayer films
R. Nath, S. Zhong, S. P. Alpay, and B. D. Hueya
Materials Science and Engineering Program and Institute of Materials Science, University of Connecticut,
Storrs, Connecticut 06269, USA
M. W. Cole
Weapons and Materials Research Directorate, Active Materials Research Group, U.S. Army Research
Laboratory, Aberdeen Proving Ground, Maryland 21005, USA
Received 13 July 2007; accepted 27 November 2007; published online 7 January 2008
Multilayered and homogeneous thin films of BaxSr1-xTiO3 BST were grown on Pt-coated Si
substrates via metal-organic solution deposition. The multilayer 220 nm thick BST heterostructure
consisted of Ba0.60Sr0.40TiO3, Ba0.75Sr0.25TiO3, and Ba0.90Sr0.10TiO3. A single composition 220 nm
thick Ba0.60Sr0.40TiO3 was also grown for comparison. The piezoelectric properties were measured
using piezoresponse force microscopy. There is approximately a 50% improvement in the
piezoelectric response of the multilayered heterostructure compared to the homogeneous sample,
with some spatial inhomogeneity. This enhancement can be attributed to the internal potential that
arises from the polarization gradient and the commensurate built-in strain in the multilayer
sample. 2008 American Institute of Physics. DOI: 10.1063/1.2825287
Ferroelectric FE multilayer and functionally graded
heterostructures have attracted considerable attention in re-


Source: Alpay, S. Pamir - Department of Materials Science and Engineering, University of Connecticut


Collections: Materials Science