| 1. |
- Lobov, A., et al.
(författare)
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Field induced evolution of regular and random 2D domain structures and shape of isolated domains in LiNbO3 and LiTaO3
- 2006
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Ingår i: Ferroelectrics (Print). - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 341:1, s. 109-116
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Tidskriftsartikel (refereegranskat)abstract
- The shapes of isolated domains produced by application of the uniform external electric field in different experimental conditions were investigated experimentally in single crystalline lithium niobate LiNbO3 and lithium tantalate LiTaO3. The study of the domain kinetics by computer simulation and experimentally by polarization reversal of the model structure using two-dimensional regular electrode pattern confirms applicability of the kinetic approach to explanation of the experimentally observed evolution of the domain shape and geometry of the domain structure. It has been shown that the fast domain walls strictly oriented along X directions appear after domain merging.
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| 2. |
- Shur, Vladimir, et al.
(författare)
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Nanoscale Domain Effects in Ferroelectrics. Formation and Evolution of Self-Assembled Structures in LiNbO3and LiTaO3
- 2007
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Ingår i: Ferroelectrics (Print). - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 354, s. 145-157
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Tidskriftsartikel (refereegranskat)abstract
- We discuss the most interesting nanoscale domain effects resulting in formation andevolution of self-assembled domain structures in various representatives of LiNbO3 andLiTaO3 family. Several exotic domain kinetic scenarios for complete suppression of theclassical wall motion have been revealed. It has been shown that the modification of thesurface layer allows to obtain: (1) the wall motion controlled by merging with nanoscaledomains generated in front of the moving wall and (2) the discrete switching by enlarge-ment of the web-like self-assembled ensemble of isolated domains. The formation ofnanoscale quasi-periodic and self-similar structures during cooling after pulse heatingwithout any application of external electric field was studied. It has been shown thatall experimental results can be explained, if the retardation of the bulk screening of thedepolarization field is taken into account.
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| 3. |
- Shur, Vladimir, et al.
(författare)
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Self-Organization in LiNbO3 and LiTaO3 : formation of Micro- and Nano-Scale Domain Patterns
- 2004
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Ingår i: Ferroelectrics (Print). - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 304, s. 111-116
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Tidskriftsartikel (refereegranskat)abstract
- We review the study of self-organized formation of several types of quasi-regular micro- and nano-scale domain patterns in single crystalline LiNbO3 and LiTaO3 samples with artificial surface dielectric layers. The domain images revealed by chemical etching have been visualized using optical, scanning electron and scanning probe microscopy (SPM) in contact atomic force mode. SPM piezoresponse imaging mode allows us to investigate the domain structure under the sample surface. We classify the obtained quasi-regular domain structures and discuss the mechanism of their formation and self-maintained growth.
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| 4. |
- Shur, Vladimir, et al.
(författare)
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Shape Evolution of Isolated Micro-Domains in Lithium Niobate
- 2007
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Ingår i: Ferroelectrics (Print). - : Informa UK Limited. - 0015-0193 .- 1563-5112. ; 360, s. 111-119
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Tidskriftsartikel (refereegranskat)abstract
- The varieties of domain shapes produced in single crystals of lithium niobate LiNbO 3 family by application of the uniform electric field have been revealed. The crucial role of predetermined nucleation effect representing the step generation at vertices of polygon domain and step growth in three Y directions was discussed. We put emphasis on formation of unusual domain shapes created by switching in non-equilibrium conditions arisen due to retardation of the screening of depolarization field. Formation of oriented fingers and dendrite self-assembled domain structures during switching with artificial surface dielectric layer and during spontaneous backswitching was considered.
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| 8. |
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| 9. |
- Shur, Vladimir, et al.
(författare)
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Modification of the Domain Kinetics in Congruent Lithium Niobate by Proton Exchanged Surface Layers
- 2006
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Konferensbidrag (refereegranskat)abstract
- We have studied the domain kinetics in congruent lithium niobate (CLN) single crystals with different types of the proton exchanged surface layers. The influence of the artificial dielectric layers and the surface gradient of the spontaneous polarization on the domain structure geometry, the shape of the individual domains, and the switching parameters were demonstrated. It was shown that after several cycles of polarization reversal the domain kinetics changes drastically. As a result the domain geometry is defined by spatial distribution of the residual domains existing in the area of domain merging during the previous switching. The role of residual domains increases with the cycle number.
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