Domain switching and spatial dependence of permittivity in ferroelectric thin films

Autor:	Dunbar P. Birnie, Ronald D. Schrimpf, J.R. Brews, Francis K. Chai
Rok vydání:	1997
Předmět:	Permittivity Materials science Condensed matter physics General Physics and Astronomy Dielectric Lead zirconate titanate Ferroelectricity law.invention Condensed Matter::Materials Science Capacitor chemistry.chemical_compound chemistry law Electrical equipment Electric field Spatial dependence
Zdroj:	Journal of Applied Physics. 82:2505-2516
ISSN:	1089-7550 0021-8979
DOI:	10.1063/1.365764
Popis:	A domain model consistent with the measured capacitance–voltage (CV) characteristics of lead zirconate titanate (PZT) capacitors is proposed. Two variants of this model are presented and compared with experimentally measured CV data. The basic model is developed adopting a macroscopic electric field that is spatially uniform through the depth of the film. Then, this model is generalized to allow a variation of the electric field with depth and to include a physically reasonable, position-dependent domain structure. Specifically, the spatial variation of the electric field is related to dopant–ion charges. As a result of the interaction between the domain properties and the electrical doping, a position dependent permittivity is induced, and the electrical properties of the capacitors are affected. Finally, computer simulations to fit the measured CV characteristics are performed to help understand the extent of the coupling between the domain properties and the electrical doping. It is found that there is...
Databáze:	OpenAIRE
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