Home

About

Advanced Search

Browse by Discipline

Scientific Societies

E-print Alerts

Add E-prints

E-print Network
FAQHELPSITE MAPCONTACT US


  Advanced Search  

 
Strain induced internal potentials of compositionally graded epitaxial ferroelectric thin films
 

Summary: Strain induced internal potentials of compositionally graded epitaxial
ferroelectric thin films
G. Akcay, S. Zhong, B. S. Allimi, and S. P. Alpaya
Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269
J. V. Mantese
United Technologies Research Center, East Hartford, Connecticut 06108
Received 11 June 2007; accepted 12 June 2007; published online 3 July 2007
Compositionally graded ferroelectrics produce internal potentials that manifest themselves as
asymmetric hysteresis in polarization versus applied field plots. The direction and magnitude of the
built-in fields depend on the sense of the chemical gradient in unclamped graded ferroelectrics. A
thermodynamic model was employed to understand how these potentials would be affected by an
inhomogeneous internal strain in epitaxial compositionally graded ferroelectric structures. The
analysis indicates that the strain field can be employed to control both the magnitude and direction
of the internal potentials. Indeed, the sense of the polarization gradient may be completely reversed
with the appropriate strain gradient. 2007 American Institute of Physics.
DOI: 10.1063/1.2754358
Polarization graded ferroelectrics have captured a great
deal of interest in recent years as they display strikingly new
behavior uncommon to homogeneous materials, the most no-
table being a translation of the ferroelectric hysteresis loop

  

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

 

Collections: Materials Science