Maurya, Anuj and Niranjan, Manish K
(2019)
Ferroelectric superlattices at nano scale: A Theoretical
Investigation.
Masters thesis, Indian institute of technology Hyderabad.
Abstract
In ferroelctrics, material size scales play a vital role in deciding its properties. Modeling of nano scale
ferroelectric superlattices require different approach than bulk sized ferroelctrics. At smaller scales, thickness becomes a important parameter that can cause variation in critical value of properties of material and to study them choice of appropriate order parameter becomes crucial. This report mainly focuses on approach using spontaneous polarization as order parameter. Variation of Polarization, susceptibility and transition critical temperature with relative thickness of layers of ferroelectric superlattice is shown along comparison with
different approach such as total polarization as order parameter, first principle calculation and experimental
data using pre-existing curves from references.The most commonly observed anomalous phenomenon of ferroelectric superlattices is that the remanent polarization is much larger than their single-phase thin films.In ferroelctrics, material size scales play a vital role in deciding its properties. Modeling of nano scale ferroelectric superlattices require different approach than bulk sized ferroelctrics. At smaller scales, thickness becomes a important parameter that can cause variation in critical value of properties of material and to study them choice of appropriate order parameter becomes crucial. This report mainly focuses on approach using spontaneous polarization as order parameter. Variation of Polarization, susceptibility and transition critical temperature with relative thickness of layers of ferroelectric superlattice is shown along comparison with
different approach such as total polarization as order parameter, first principle calculation and experimental
data using pre-existing curves from references.The most commonly observed anomalous phenomenon of ferroelectric superlattices is that the remanent polarization is much larger than their single-phase thin films. Going at very small scale of ferroelectric materials along with superlattice geomatry, one can see very interesting feature of it. In this type of structure, small variation in thickness of layers enhances dielectric constant and polarization of the sample. Going at very small scale of ferroelectric materials along with superlattice geomatry, one can see very interesting feature of it. In this type of structure, small variation in thickness of layers enhances dielectric constant and polarization of the sample.
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