128 research outputs found
Humidity effects on tip-induced polarization switching in lithium niobate
Interest to ferroelectric materials has been increased significantly in last
decades due to development of new generation of nonlinear optical and data
storage devices. Scanning probe microscopy (SPM) can be used both for study of
domain structures with nanoscale spatial resolution and for writing the
isolated nanodomains by local application of the electric field. Tip-induced
switching in the ambient still needs experimental investigations and
theoretical explorations. Here we studied influence of the value of relative
humidity in the SPM chamber on the process of tip-induced polarization
switching. This phenomenon was attributed to existing of the water meniscus
between tip and the sample surface in humid atmosphere. Presented results are
important for further complex investigations of the ferroelectric materials and
their applications.Comment: 15 pages, 5 figures, Submitted to Applied Physics Letter
Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals
We have studied the ferroelectric nanodomain formation in single crystals of strontium barium niobate Sr 0.61Ba 0.39Nb 2O 6 using piezoelectric force microscopy and Raman confocal microscopy. The nanodomain structures have been created by application of the uniform electric field at room temperature. Four variants of nanodomain structure formation have been revealed: (1) discrete switching, (2) incomplete domain merging, (3) spontaneous backswitching, and (4) enlarging of nanodomain ensembles. Kinetics of the observed micro- and nanodomain structures has been explained on the basis of approach developed for lithium niobate and lithium tantalate crystals. © 2012 American Institute of Physics
Orientation, substructure, and optical properties of rutile films
The orientation, optical properties, and substructure of rutile films prepared by thermal and pulsed photon assisted oxidation of single crystal Ti films were investigated by transmission electron micros copy, optical spectroscopy, and high energy electron diffractionyesBelgorod State Universit
Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals
We have studied the ferroelectric nanodomain formation in single crystals of strontium barium niobate Sr 0.61Ba 0.39Nb 2O 6 using piezoelectric force microscopy and Raman confocal microscopy. The nanodomain structures have been created by application of the uniform electric field at room temperature. Four variants of nanodomain structure formation have been revealed: (1) discrete switching, (2) incomplete domain merging, (3) spontaneous backswitching, and (4) enlarging of nanodomain ensembles. Kinetics of the observed micro- and nanodomain structures has been explained on the basis of approach developed for lithium niobate and lithium tantalate crystals. © 2012 American Institute of Physics
Investigation local switching and self-organization effects on non-polar cuts of lithium niobate
The equipment of the Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University was used. The research was made possible by Russian Science Foundation (Grant 14-12-00826)
Synthesis and Cytotoxic Effect of 1-Aryl-Substituted-6-Imino-2,7-Dioxabicyclo[3.2.1]Octane-4,4,5-Tricarbonitriles
The work was carried out within the framework of scholarship SP-127.2016.4 from the President of the Russian Federation for young scientists and graduate students
Tip-induced domain growth on the non-polar cuts of lithium niobate single-crystals
Currently, ferroelectric materials with designed domain structures are considered as a perspective material for new generation of photonic, data storage, and data processing devices. Application of external electric field is the most convenient way of the domain structure formation. Lots of papers are devoted to the investigation of domain kinetics on polar surface of crystals while the forward growth remains one of the most mysterious stages due to lack of experimental methods allowing to study it. Here, we performed tip-induced polarization reversal on X- and Y-non-polar cuts in single-crystal of congruent lithium niobate which allows us to study the forward growth with high spatial resolution. The revealed difference in the shape and length of domains induced on X- and Y-cuts is beyond previously developed theoretical approaches used for the theoretical consideration of the domains growth at non-polar ferroelectric surfaces. To explain experimental results, we used kinetic approach with anisotropy of screening efficiency along different crystallographic directions. © 2015 AIP Publishing LLC
Characterization of LiMn2O4 cathodes by electrochemical strain microscopy
Electrochemical strain microscopy (ESM) is a scanning probe microscopy (SPM) method in which
the local electrodiffusion is probed via application of AC voltage to the SPM tip and registration of
resulting electrochemical strain. Here, we implemented ESM to measure local strain in bulk
LiMn2O4 cathodes of a commercial Li-battery in different states of charge to investigate distribution
of Li-ion mobility and concentration. Ramped AC ESM imaging and voltage spectroscopy
were used to find the most reliable regime of measurements allowing separating and diminishing
different contributions to ESM. This is not a trivial task due to complex geometry of the sample
and various obstacles resulting in less predictable contributions of different origins into ESM
response: electrostatic tip surface interactions, charge injection, electrostriction, and flexoelectricity.
Understanding and control of these contributions is an important step towards quantitative
interpretation of ESM data
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