TITLE

Well-ordered arrays of pyramid-shaped ferroelectric BaTiO[sub 3] nanostructures

AUTHOR(S)
Ma, Wenhui; Harnagea, Catalin; Hesse, Dietrich; Gösele, Ulrich
PUB. DATE
November 2003
SOURCE
Applied Physics Letters;11/3/2003, Vol. 83 Issue 18, p3770
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Monolayers of monodisperse latex spheres of micron size were used as deposition masks to fabricate arrays of ferroelectric nanostructures by pulsed laser deposition using a BaTiO[sub 3] target. First, arrays of well-ordered structures were prepared on SrTiO[sub 3]:Nb (100) single-crystal substrates at room temperature. Investigations of these isolated as-deposited nanostructures by atomic force microscopy revealed that they have a pyramid-like shape with about 200 nm lateral size at half their height and form a regular hexagonal pattern. Then postdeposition annealing was used to crystallize the nanostructures. The ferroelectric properties of the crystalline structures were investigated by scanning force microscopy in piezoresponse mode. Piezoelectric hysteresis loops were recorded, demonstrating that the barium titanate nanopyramids have a remanent polarization and are switchable by an electric field, i.e., they are indeed ferroelectric. © 2003 American Institute of Physics.
ACCESSION #
11210003

 

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