TITLE

Ferroelectric hysteresis loops of (Pb,Ca)TiO3 thin films under spherical indentation

AUTHOR(S)
Algueró, M.; Calzada, M. L.; Bushby, A. J.; Reece, M. J.
PUB. DATE
September 2004
SOURCE
Applied Physics Letters;9/13/2004, Vol. 85 Issue 11, p2023
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Ferroelectric switching under indentation forces has been studied for a set of (Pb,Ca)TiO3 ferroelectric thin films. A radius of contact of 10.2 μm and an average pressure of 1.5 GPa have been estimated by Hertzian theory. The indentation stress field prevents the ferroelectric hysteresis loops from becoming saturated. Ferroelectric switching is hindered and apparent coercive fields as high as 400 kV cm-1 were observed. As a consequence, small remnant polarizations were obtained. The effect is proposed to be caused by a combination of a decrease of the electric polarization that can be switched by 180° domain wall movements, as a consequence of stress induced 90° domain wall movements under the indentation force, and the clamping of the 90° domain walls by the indentation stress field.
ACCESSION #
14434589

 

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