Atomic Scale Structure Variations at Ferroelectric Domain Walls in Multiferroic BiFeO3 PDF Download
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Author: Man Ho Leung
Publisher:
ISBN:
Category : Domain structure
Languages : en
Pages : 106
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Book Description
Author: Man Ho Leung
Publisher:
ISBN:
Category : Domain structure
Languages : en
Pages : 106
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Book Description
Author: Jill Guyonnet
Publisher: Springer Science & Business Media
ISBN: 3319057502
Category : Science
Languages : en
Pages : 167
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Book Description
Using the nano metric resolution of atomic force microscopy techniques, this work explores the rich fundamental physics and novel functionalities of domain walls in ferroelectric materials, the nano scale interfaces separating regions of differently oriented spontaneous polarization. Due to the local symmetry-breaking caused by the change in polarization, domain walls are found to possess an unexpected lateral piezoelectric response, even when this is symmetry-forbidden in the parent material. This has interesting potential applications in electromechanical devices based on ferroelectric domain patterning. Moreover, electrical conduction is shown to arise at domain walls in otherwise insulating lead zirconate titanate, the first such observation outside of multiferroic bismuth ferrite, due to the tendency of the walls to localize defects. The role of defects is then explored in the theoretical framework of disordered elastic interfaces possessing a characteristic roughness scaling and complex dynamic response. It is shown that the heterogeneous disorder landscape in ferroelectric thin films leads to a breakdown of the usual self-affine roughness, possibly related to strong pinning at individual defects. Finally, the roles of varying environmental conditions and defect densities in domain switching are explored and shown to be adequately modelled as a competition between screening effects and pinning.
Author: Dennis Meier
Publisher: Oxford University Press, USA
ISBN: 0198862490
Category : Science
Languages : en
Pages : 366
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Book Description
As the first of its kind, this book identifies major questions and challenges that will influence research on domain walls in the years to come.
Author: Arash Yavari
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 398
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Book Description
Author: Vladimir M. Fridkin
Publisher: Springer Science & Business Media
ISBN: 3642813518
Category : Science
Languages : en
Pages : 179
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Book Description
Since Valasek's discovery of the ferroelectric properties of Rochelle salt nearly 60 years ago, ferroelectricity has been regarded as one of the tradi tional branches of dielectric physics. It has had important applications in lattice dynamics, quantum electronics, and nonlinear optics. The study of electron processes in ferroelectrics was begun with VUL's investigations of the ferroelectric properties of barium titanate [1.1]. In trinsic and extrinsic optical absorption, band structure, conductivity and photoconductivity, carrier mobility. and transport mechanisms were examined in this compound, and in other perovskite ferroelectric semiconductors. An important discovery was that of the highly photosensitive photoconducting ferroelectrics of type AVBVICVIII (e.g. SbSI) by MERZ et al. in 1962 [1.2,3]. A large number of ferroelectric semiconductors (some photosensitive, some not) are now known, including broad-band materials (e.g. lithium niobate, lithium tantalate, barium and strontium niobate, and type-A~B~I compounds), BI and narrow-band semiconductors (e.g. type_AIVB compounds). A series of improper ferroelectric semiconductors and photosensitive ferroelastics have been discovered, of which Sb 0 I is an example. s 7 Owing to the uncertainty of their band structure, the difficulty in deter mining the nature of the levels, the complexity of alloying, and their gen erally low mobility values, ferroelectrics are rarely of interest regarded as nonlinear semiconductors. The most fruitful approach has been the study of the influence of electrons (especially nonequilibrium electrons) and electron excitations on phase transitions and ferroelectric properties. A large group of phenomena have recently been discovered and investigated.
Author: Rakesh Kumar Behera
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The effect of grain boundaries on polarization are calculated for sigma 5 coincident site lattice (310) tilt boundaries in strontium titanate and lead titanate. The reverse twinned structures are found to be energetically more favorable than the regular twins. The presence of the boundary resulted in a local polarization around the boundary (normal and parallel to the boundary), which vanishes away from the boundary. This study also focuses on the challenge to simulate complex ferroelectric structures. As a first step towards achieving the goal, the existing parallel molecular dynamics code was modified to include the core-shell model, thereby allowing complex ferroelectric systems to be simulated.
Author: Junling Wang
Publisher: CRC Press
ISBN: 1315355264
Category : Science
Languages : en
Pages : 374
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Book Description
"a very detailed book on multiferroics that will be useful for PhD students and researchers interested in this emerging field of materials science" —Dr. Wilfrid Prellier, Research Director, CNRS, Caen, France Multiferroics has emerged as one of the hottest topics in solid state physics in this millennium. The coexistence of multiple ferroic/antiferroic properties makes them useful both for fundamental studies and practical applications such as revolutionary new memory technologies and next-generation spintronics devices. This book provides an historical introduction to the field, followed by a summary of recent progress in single-phase multiferroics (type-I and type-II), multiferroic composites (bulk and nano composites), and emerging areas such as domain walls and vortices. Each chapter addresses potential technological implications. There is also a section dedicated to theoretical approaches, both phenomenological and first-principles calculations.
![PbZrTiO3[subscript] and BiFeO3[subscript] Ferroelectric Domains, Domain Boundaries, and Switching Investigated with Piezo Force Microscopy PDF](https://books.google.com/books/content/images/frontcover/1xSznQEACAAJ?fife=w80-h100)
Author: Linghan Ye
Publisher:
ISBN:
Category :
Languages : en
Pages : 156
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Book Description
Author: Karin M. Rabe
Publisher: Springer Science & Business Media
ISBN: 3540345914
Category : Technology & Engineering
Languages : en
Pages : 395
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Book Description
The past two decades have witnessed revolutionary breakthroughs in the understanding of ferroelectric materials, both from the perspective of theory and experiment. This book addresses the paradigmatic shifts in understanding brought about by these breakthroughs, including the consideration of novel fabrication methods and nanoscale applications of these materials, and new theoretical methods such as the effective Hamiltonian approach and density functional theory.
Author: Ming Liu
Publisher: John Wiley & Sons
ISBN: 3527341773
Category : Science
Languages : en
Pages : 258
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Book Description
Written by well-known experts in the field, this first systematic overview of multiferroic heterostructures summarizes the latest developments, first presenting the fundamental mechanisms, including multiferroic materials synthesis, structures and mechanisms, before going on to look at device applications. The resulting text offers insight and understanding for scientists and students new to this area.
