Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 20 for “"ferroelectric domain"”.
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Hall Potential Mapping of Conducting Ferroelectric Domain Walls
… phenomenon of distinct conductivity at certain ferroelectric domain walls has the potential to revolutionise nanoelectronics. Complete control over their local carrier properties would allow two-dimensional analogues of semiconducting devices to be dynamically written, effectively supplanting …
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Phonon scattering by ferroelectric domain walls in potassium dihydrogen phosphate
I have studied phonon scattering by ferroelectric domain walls in KH2P04 (KDP) using thermal conductivity and phonon imaging measurements of samples in both single-domain (poled) and multidomain states. Domains were eliminated by applying a 2- 3kV /em field using evaporated electrodes. Phonon …
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Light-induced ferroelectric domain engineering in lithium niobate & lithium tantalate
The influence of illumination on ferroelectric domain engineering in lithium niobate and lithium tantalate is investigated. The conventional method of domain inversion is electric field poling, which suffers from several limitations such as a requirement for photolithography and high-voltage …
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Charged ferroelectric domain walls: the next generation in 2D functional materials
… the properties of charge carriers in conducting ferroelectric domain walls in single crystals of YbMnO3, ErMnO3 and lithium niobate. <br/><br/>Through the use of atomic force microscopy (AFM), electron microscopy and electrical measurements I measured Hall mobility in these systems. This revealed …
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Multiscale Simulations of Dynamics of Ferroelectric Domains
Ferroelectric materials exhibiting switchable polarization have been used as critical components in electronics, memory, actuators and acoustics, and electro-optics. The applications of ferroelectric materials heavily rely on the interactions between the polarization and external perturbations, …
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Interactions of single-crystal lithium niobate surfaces with ultra-violet laser radiation
… by low intensity laser irradiation, effects on ferroelectric domain inversion by focussed laser irradiation, and modelling of the heating and subsequent lithium diffusion during focussed laser irradiation.<br/><br/>It was seen that irradiation of ultraviolet laser light with a photon energy …
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Substrate Dependence on the Growth and Texture of Lead Titanate and Lead Zirconate Titanate Thin Films by Metal Organic Chemical Vapor Deposition
… are single crystalline and exhibit ferroelectric domain structures. The differential thermal stress and the transformation stress are important in determining the resulting domain structures. On the other hand, growth conditions and microstructures are different when PT and PZT films …
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Investigation of Ferroelectric Thin Film Using Piezoresponse Force Microscopy
Ferroelectric materials have found a wide range of applications in data storage devices, sensors and actuators, capacitors, oscillators and filters, among others thanks to fabrication methods that allow integration into semiconductor devices at micro and nanoscales. As many of these materials also …
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Direct UV writing of structures in lithium niobate and lithium tantalate
… improvements in waveguide lifetimes. Surface domain reversal was observed in congruent lithium niobate on both +z and -z faces. Channel waveguides written into lithium tantalate were characterised and compared with lithium niobate.<br/><br/>Surface ferroelectric domain reversal via …
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Acousto-Electric Impedance Of Ferroelectric Phononic Superlattice
The Acousto-Electric Impedance z of a Ferroelectric Phononic Superlattice (fps) is investigated. The analytical derivation of z and its phase reveal that both are functions of physical parameters such as the electromechanical coupling coefficient, the mechanical quality factor, the domain length …
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Belęšė holografijos sistema žadinimo zondavimo eksperimentuose /
… such as shock waves in solid state bodies, ferroelectric domain switching, and the formation of color centers. This versatility and compact design make it a valuable tool for both scientific research and industrial applications, paving the way for innovative advancements in imaging …
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X-ray scattering studies of strongly correlated materials: orbital ordering in KCuF3 and stripe-like domain structures in BiFeO3 epitaxial thin films
… ordered KCuF3 and periodic arrays of stripe-like ferroelectric domains in epitaxial thin films of multiferroic BiFeO3 are presented in this dissertation. Both resonant soft x-ray elastic scattering and non-resonant hard x-ray elastic scattering probes were used. Our experiments on KCuF3 have …
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Orientation dependence of dielectric susceptibilities and switching characteristics in epitaxial ferroelectric thin films
When subjected to low electric field, domain walls play an important role in determining the response of ferroelectrics to applied stimuli. While contributions to ferroelectric properties from the intrinsic response of the polarization within a domain and so-called extrinsic contributions from the …
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Processing - structure - property interrelationships of ferroelectric thin films with emphasis on formation kinetics
Lead zirconate titanate (PZT) is a ferroelectric material which has many interesting properties. Recently, PZT thin films have been considered as one of the most promising materials for the application of nonvolatile electronic memories. In this study, a sol-gel process for PZT film preparation was …
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Strain-phase relations in lead-free ferroelectric KxNa1-xNbO3 epitaxial films for domain engineering
… films for technical applications by tuning the ferroelectric film properties on the basis of the strain-phase diagram. For this purpose, a fundamental understanding of the relation between incorporated lattice strain by epitaxial growth of thin films and the evolution of ferroelectric phases has …
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Molecular Beam Epitaxy Synthesis and Characterization of Indium Selenide Films
… device arose from charge trapping rather than ferroelectricity. Hysteresis in all devices occurred in a clockwise direction, which could be expected for ferroelectricity in an FeSFET with the device dimensions used in this study. Stepwise increase in the VGS sweep range was performed on all …
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An investigation into six-fold domain wall vertices in improper ferroelectrics, and their potential as one dimensional pn-junctions
… the carrier characteristics of conducting ferroelectric domain walls in the improper ferroelectric system ErMnO3. Preliminary measurements reveal that p-type carriers aggregate at tail-to-tail domain walls. QuickField modelling allowed for estimates of the effective cross-sectional area of …
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Structural Investigations of Highly Strictive Materials
Ferroelectric (piezoelectric) and ferromagnetic materials have extensively permeated in modern industry. (Na1/2Bi1/2)TiO3-BaTiO3 (NBT-x%BT) single crystals and K1/2Na1/2NbO3 (KNN) textured ceramics are top environment-friendly candidates which have potential to replace the commercial lead zirconate …
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Synthesis-Structure-Property Relationships in Lead-Free Piezoelectric Materials
… through microstructure optimization, domain engineering and multilayering. All these approaches are challenging and require innovation to make a significant impact on the current state-of-the-art. In this thesis, the later line of research was focused which is promising for near future …