DISPLACEMENTS AND VELOCITIES OF THE DOMAIN WALLS IN KDP EXISTENCE OF CRITICAL ELECTRIC FIELDS

1972 ◽  
Vol 33 (C2) ◽  
pp. C2-153-C2-154
Author(s):  
J. BORNAREL ◽  
J. LAJZEROWICZ
Keyword(s):  
Electric Fields ◽  
Domain Walls

Displacement Charge Patterns and Ferroelectric Domain Wall Dynamics Studied by In-Situ Tem

1999 ◽  
Vol 596 ◽  
Author(s):  
A. Krishnan ◽  
M. M. J. Treacy ◽  
M. E. Bisher ◽  
P. Chandra ◽  
P. B. Littlewood
Keyword(s):  
Electric Fields ◽  
Domain Walls ◽  
Energy State ◽  
Ferroelectric Domain ◽  
Potassium Niobate ◽  
In Situ Tem ◽  
Domain Wall Dynamics ◽  
Transmission Electron ◽  
Energy Domain

AbstractWe have observed the growth of domains in ferroelectric barium titanate and potassium niobate using a transmission electron microscope. When domains move in response to electric fields we see a scaling effect where the fine scale domain structure is activated first, followed by larger length-scale patterns. Curvature and tilting of domain walls leads to local uncompensated displacement charge and external fields can interact with these charged walls. In this paper, we posit that the presence of displacement charge on domain walls is important for polarization switching. Charge-neutral domain configurations are in a lower energy state and are harder to switch. We argue that the number of charge-neutral, low energy domain configurations can increase with time. This mechanism provides an intrinsic contribution to ferroelectric fatigue.

scholarly journals Polarizability of electrically induced magnetic vortex “atoms”

2018 ◽  
Vol 185 ◽  
pp. 07003
Author(s):  
P.I. Karpov ◽  
S.I. Mukhin
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Domain Walls ◽  
Topological Defects ◽  
Magnetic Vortex ◽  
Distribution Profile ◽  
Magnetic Structures ◽  
Magnetic Vortices ◽  
Vortex Density ◽  
Magnetoelectric Materials

Electric field control of magnetic structures, particularly topological defects in magnetoelectric materials, draws a great attention, which has led to experimental success in creation and manipulation of single magnetic defects, such as skyrmions and domain walls. In this work we explore a scenario of electric field creation of another type of topological defects – magnetic vortices and antivortices. Because of interaction of magnetic and electric subsystems each magnetic vortex (antivortex) in magnetoelectric materials possesses quantized magnetic charge, responsible for interaction between vortices, and electric charge that couples them to electric field. This property of magnetic vortices makes possible their creation by electric fields. We show that the electric field, created by a cantilever tip, produces a “magnetic atom” with a localized spot of ordered vortices (“nucleus” of the atom) surrounded by antivortices (“electronic shells”). We analytically find the vortex density distribution profile and temperature dependence of polarizability of this structure and confirm it numerically by Monte Carlo simulation.

Development of a Material Constitutive Model and Simulation Technique to Predict Nonlinearities in Piezoelectric Materials under Weak Electric Fields

2017 ◽  
pp. 271-303
Author(s):  
M. K. Samal
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Lead Zirconate Titanate ◽  
Domain Walls ◽  
Piezoelectric Materials ◽  
Experimental Results ◽  
Ferroelectric Ceramics ◽  
Rayleigh Law ◽  
Model And Simulation ◽  
Near Resonance

Piezoceramic materials exhibit different types of nonlinearities depending upon the magnitude of the mechanical and electric field strength in the continuum. Some of the nonlinearities observed under weak electric fields are: presence of superharmonics in the response spectra and jump phenomena etc. especially if the system is excited near resonance. It has also been observed by many researchers that, at weak alternating stress fields, the relationship between the piezoelectrically induced charge and applied stress in ferroelectric ceramics, has the same form as the Rayleigh law (for magnetization versus magnetic field) in ferromagnetic materials. Applicability of the Rayleigh law to the piezoelectric effect has been demonstrated for Lead Zirconate Titanate ceramics by many researchers and their experimental results indicate that the dominant mechanism responsible for piezoelectric hysteresis and the dependence of the piezoelectric coefficient on the applied alternating stress is the pinning of non-180° domain walls. In this chapter, the Rayleigh law for ferromagnetic hysteresis has been modified and incorporated in a nonlinear electric enthalpy function and then applied in the analysis of hysteresis behavior of piezoelectric continua. Analytical solutions have been derived for a cantilever beam actuated by two piezo-patches attached to the top and bottom of the beam and excited by opposite electric fields. Analysis has been carried out at different electric field excitations of varying amplitude and frequencies and the results have been compared with the available experimental results from literature.

Luminescence and Raman Based Real Time Imaging of Ferroelectric Domain Walls

2006 ◽  
Vol 966 ◽  
Author(s):  
Volkmar Dierolf ◽  
Pavel Capek ◽  
Christian Sandmann
Keyword(s):  
Raman Spectroscopy ◽  
Domain Wall ◽  
Real Time ◽  
Electric Fields ◽  
Domain Walls ◽  
Ferroelectric Domain ◽  
Rare Earth Ions ◽  
The Other ◽  
Current Status ◽  
Sensitive Tool

ABSTRACTWe studied ferroelectric domain wall regions in lithium niobate using the photoluminescence of intentionally doped rare earth ions (such as Er3+) as well as Raman spectroscopy and present an overview of the current status of our ongoing investigations. We find that the Er emission is a sensitive tool to observe changes in local electric fields as well as reconfiguration of defect dipoles across the domain wall. The Raman spectra, on the other hand can be used to identify charges that accumulate asymmetrically across a domain wall. We further demonstrate that the imaging methods offer sufficient sensitivity to observe the changes associated with a domain in real time while it is moving.

Nonlinear Dielectric and Piezoelectric Responses in (Bi, La)FeO3-Pb(Ti, Mn)O3 Ceramics

2012 ◽  
Vol 1397 ◽  
Author(s):  
Guiyang Shi ◽  
Shundong Bu ◽  
Rui Dai ◽  
Shengwen Yu ◽  
Jinrong Cheng
Keyword(s):  
Electric Fields ◽  
Dielectric Response ◽  
Piezoelectric Coefficient ◽  
Domain Walls ◽  
Piezoelectric Properties ◽  
Nonlinear Coefficient ◽  
Solid State Reaction Method ◽  
Nonlinear Dielectric ◽  
Rayleigh Law ◽  
Applied Fields

ABSTRACTPolycrystalline solutions of 0.6(Bi0.9La0.1)FeO3-0.4Pb(Ti1-xMnx)O3(BLF-PTM, x=0 and 0.01)have been fabricated by the so-gel process combined with a solid state reaction method. BLF-PTM exhibits the nonlinear dielectric and piezoelectric responses under applied fields. Rayleigh law has been used to evaluate the irreversible contribution of the domain walls movement to the nonlinear dielectric response. Rayleigh analysis reveals that a mechanism with no associated loss exists in the BLF-PTM of x=0.01. The real part piezoelectric coefficient of BLF-PTM linearly increases with increasing the electric fields. The dielectric and piezoelectric nonlinear coefficient of 0.17×10-3 m/V and 0.897 ×10-17 m2/V2 respectively are obtained for BLF-PTM of x=0.01,which are smaller than those of 0.22×10-3 m/V and 1.19 ×10-17 m2/V2 for BLF-PTM of x=0. Our results indicate that Mn doping increase the intrinsic piezoelectric properties of BLF-PTM reducing the extrinsic contributions to piezoelectric responses.

scholarly journals Низко- и инфранизкочастотная дисперсия диэлектрической проницаемости в матричном композите нанокристаллическая целлюлоза-триглицинсульфат

2018 ◽  
Vol 60 (3) ◽  
pp. 553
Author(s):  
Nguyen Hoai Thu'o'ng ◽  
А.С. Сидоркин ◽  
С.Д. Миловидова
Keyword(s):  
Dielectric Permittivity ◽  
Electric Fields ◽  
Room Temperature ◽  
Domain Walls ◽  
Dielectric Dispersion ◽  
Triglycine Sulfate ◽  
Residual Water ◽  
Frequency Range ◽  
Temperature Dependent ◽  
Additional Peak

AbstractThe dispersion of dielectric permittivity in nanocrystalline cellulose–triglycine sulfate composites is studied in the range of frequencies from 10^–3 to 10^6 Hz, at temperatures varying from room temperature to the temperature of phase transition in this composite (54°C), in weak electric fields (1 V cm^–1). Two behaviors for the dielectric dispersion are identified in the studied frequency range: at ultralow frequencies (10^–3–10 Hz), the dispersion is due to Maxwell–Wagner polarization, while at higher frequencies (10–10^6 Hz), the dispersion is due to the movement of domain walls in the embedded triglycine sulfate crystallites. An additional peak in the temperature-dependent profiles of dielectric permittivity is detected at lower temperatures in freshly prepared samples of the considered composite; we associate it with the presence of residual water in these samples.

scholarly journals Structures and electronic properties of domain walls in BiFeO3 thin films

2019 ◽  
Vol 6 (4) ◽  
pp. 669-683 ◽  
Author(s):  
Huaixun Huyan ◽  
Linze Li ◽  
Christopher Addiego ◽  
Wenpei Gao ◽  
Xiaoqing Pan
Keyword(s):  
Thin Films ◽  
Electric Fields ◽  
Domain Walls ◽  
Essential Element ◽  
Atomic Scale ◽  
Photovoltaic Properties ◽  
Bifeo3 Thin Films ◽  
Physical Volume ◽  
Structures And Properties ◽  
Fundamental Understanding

Abstract Domain walls (DWs) in ferroelectrics are atomically sharp and can be created, erased, and reconfigured within the same physical volume of ferroelectric matrix by external electric fields. They possess a myriad of novel properties and functionalities that are absent in the bulk of the domains, and thus could become an essential element in next-generation nanodevices based on ferroelectrics. The knowledge about the structure and properties of ferroelectric DWs not only advances the fundamental understanding of ferroelectrics, but also provides guidance for the design of ferroelectric-based devices. In this article, we provide a review of structures and properties of DWs in one of the most widely studied ferroelectric systems, BiFeO3 thin films. We correlate their conductivity and photovoltaic properties to the atomic-scale structure and dynamic behaviors of DWs.

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