Complex study of bulk screening processes in single crystals of lithium niobate and lithium tantalate family

Shur, V. Ya.; Ахматханов, А. Р.; Батурин, И. С.; Nebogatikov, M. S.; Dolbilov, M. A.

doi:10.1134/s1063783410100215

Cited by 28 publications

(11 citation statements)

References 27 publications

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“…50 Local domain nucleation and propagation requires stabilization through screening of surface bound charge, which can be provided externally by reorientation of charge in electrodes and adsorbed ions, and also internally through bulk conductivity and charge injection. 25,28,46,51 Polarization dependent dielectric surface layers 50,52 can inhibit external screening, thus changing conditions for domain evolution. 49,51,53 However, the results suggest only a minor influence of such "dead" layers as (i) domain patterns clearly depend on external conditions such as humidity and (ii) external screening is minimized in dry conditions for which the polarization dependence was observed.…”

Section: Domain Size Dependence Of Initial Polarizationmentioning

confidence: 99%

“…25,28,46,51 Polarization dependent dielectric surface layers 50,52 can inhibit external screening, thus changing conditions for domain evolution. 49,51,53 However, the results suggest only a minor influence of such "dead" layers as (i) domain patterns clearly depend on external conditions such as humidity and (ii) external screening is minimized in dry conditions for which the polarization dependence was observed. Downwards band bending at a newly nucleated positive domain upon application of high negative voltages facilitates electron injection from the top electrode, which allows for screening and larger domain sizes.…”

Section: Domain Size Dependence Of Initial Polarizationmentioning

confidence: 99%

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Thickness, humidity, and polarization dependent ferroelectric switching and conductivity in Mg doped lithium niobate

Neumayer

Strelcov

Manzo

et al. 2015

Journal of Applied Physics

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Mg doped lithium niobate (Mg:LN) exhibits several advantages over undoped LN such as resistance to photorefraction, lower coercive fields, and p-type conductivity that is particularly pronounced at domain walls and opens up a range of applications, e.g., in domain wall electronics. Engineering of precise domain patterns necessitates well founded knowledge of switching kinetics, which can differ significantly from that of undoped LN. In this work, the role of humidity and sample composition in polarization reversal has been investigated under application of the same voltage waveform. Control over domain sizes has been achieved by varying the sample thickness and initial polarization as well as atmospheric conditions. In addition, local introduction of proton exchanged phases allows for inhibition of domain nucleation or destabilization, which can be utilized to modify domain patterns. Polarization dependent current flow, attributed to charged domain walls and band bending, demonstrates the rectifying ability of Mg:LN in combination with suitable metal electrodes that allow for further tailoring of conductivity. V C 2015 AIP Publishing LLC.

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Section: Domain Size Dependence Of Initial Polarizationmentioning

confidence: 99%

Section: Domain Size Dependence Of Initial Polarizationmentioning

confidence: 99%

Thickness, humidity, and polarization dependent ferroelectric switching and conductivity in Mg doped lithium niobate

Neumayer

Strelcov

Manzo

et al. 2015

Journal of Applied Physics

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“…The exponent value equal to 0.3 is chosen according to our earlier experimental results. 28 The value of E th . pc equal to 60 V/mm is chosen as the lowest external field in which polarization reversal started in our study.…”

Section: Field Dependence Of the Switching Timementioning

confidence: 99%

Polarization reversal and jump-like domain wall motion in stoichiometric LiTaO3 produced by vapor transport equilibration

Shur

Ахматханов

Батурин

et al. 2012

Journal of Applied Physics

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The polarization reversal and domain structure evolution has been studied in stoichiometric lithium tantalate prepared by vapor transport equilibration process. The first in situ visualization of domain kinetics has demonstrated the jump-like motion of few strictly oriented plane domain walls, which leads to short isolated current pulses in the switching current data. The proposed model of jump-like domain wall motion caused by interaction with pinning centers representing the areas with increased value of the threshold field is based on the effect of retardation of bulk screening. The derived formulas were applied successfully for analysis of the field dependence of the total switching time. The durations of wall jumps and wall stays (rest times) extracted from the switching current data are analyzed separately. The deceleration of the wall motion velocity during jump is controlled by the trail of residual depolarization field produced by bound charges and screening charges in the area behind the wall. The duration of the rest time is governed by the bulk screening of residual depolarization field. The value of Hurst exponent 0.75 obtained by fractal analysis of the switching current data has confirmed the essential influence of prehistory on the domain wall motion. The measurements of the coercive field by switching in bipolar triangular pulses in wide range of the field ramp rate have allowed us to extract the record low value of coercive field 60 V/mm for quasi-static polarization reversal.

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“…LN has a spontaneous polarization, P s = 0.71 C m −2 , along the z ‐axis and is thus characterized by positive and negative bound polarization charge at the + z and – z crystal surfaces, respectively. The bound polarization charge is compensated simultaneously by ( i ) internal screening via the formation of a space‐charge layer near the surface and ( ii ) external screening via the surface adsorption of charged molecules or surface states . The main screening mechanism in LN is external; for the + z surface in a liquid environment, the polarization charge will be screened by anions and negatively charged molecules, while the – z surface will be screened by cations and positively charged molecules …”

Section: Introductionmentioning

confidence: 99%

Biocompatibility of ferroelectric lithium niobate and the influence of polarization charge on osteoblast proliferation and function

Carville

Collins

Manzo

et al. 2014

J Biomedical Materials Res

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In this work, the influence of substrate surface charge on in vitro osteoblast cell proliferation on ferroelectric lithium niobate (LN) crystal surfaces is investigated. LN has a spontaneous polarization along the z-axis and is thus characterized by positive and negative bound polarization charge at the +z and -z surfaces. Biocompatibility of LN was demonstrated via culturing and fluorescence imaging of MC3T3 osteoblast cells for up to 11 days. The cells showed enhanced proliferation rates and improved osteoblast function through mineral formation on the positively and negatively charged LN surfaces compared to electrostatically neutral x-cut LN and a glass cover slip control. These results highlight the potential of LN as a template for investigating the role of charge on cellular processes.

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Complex study of bulk screening processes in single crystals of lithium niobate and lithium tantalate family

Cited by 28 publications

References 27 publications

Thickness, humidity, and polarization dependent ferroelectric switching and conductivity in Mg doped lithium niobate

Thickness, humidity, and polarization dependent ferroelectric switching and conductivity in Mg doped lithium niobate

Polarization reversal and jump-like domain wall motion in stoichiometric LiTaO3 produced by vapor transport equilibration

Biocompatibility of ferroelectric lithium niobate and the influence of polarization charge on osteoblast proliferation and function

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