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Compositional symmetry breaking in ferroelectric bilayers S. Zhong and S. P. Alpaya

Summary: Compositional symmetry breaking in ferroelectric bilayers
S. Zhong and S. P. Alpaya
Department of Materials Science and Engineering and Institute of Materials Science,
University of Connecticut, Storrs, Connecticut 06269
J. V. Mantese
Delphi Research Laboratories, Shelby Township, Michigan 48315
Received 2 May 2005; accepted 13 July 2005; published online 30 August 2005
Compositional variations across ferroelectric bilayers result in broken spatial inversion symmetry
that can lead to asymmetric thermodynamic potentials. For the case of insulating materials,
ferroelectric multilayers will self-pole due to the electrostatic coupling between the layers.
Polarization-graded ferroelectrics with smooth composition, temperature, or stress gradients are
viewed as bilayer structures in the limit of the ever-increasing number of bilayer couples, thus
permitting us to conclude that the unconventional hysteresis associated with "up" and "down"
polarization graded structures are real phenomena, and not artifacts associated with free charge or
asymmetric leakage current. 2005 American Institute of Physics. DOI: 10.1063/1.2039990
It has been more than ten years since an unconventional
form of hysteresis was first observed and characterized from
polarization-graded ferroelectrics FEs .1
Subsequently, it
was concluded that the offsets observed from "up" and


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


Collections: Materials Science