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An Investigation Of The Inter Phase Magnetoelectric Coupling Phenomenon In Nanoscale Multiferroic Composite Devices
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Book Synopsis An Investigation of the Inter-phase Magnetoelectric Coupling Phenomenon in Nanoscale Multiferroic Composite Devices by : Stuart Raymond Jackson
Download or read book An Investigation of the Inter-phase Magnetoelectric Coupling Phenomenon in Nanoscale Multiferroic Composite Devices written by Stuart Raymond Jackson and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Investigation of the Inter-phase Magnetoelectric Coupling Phenomenon in Nanoscale Multiferroic Composite Devices by : S. R. Jackson
Download or read book An Investigation of the Inter-phase Magnetoelectric Coupling Phenomenon in Nanoscale Multiferroic Composite Devices written by S. R. Jackson and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoscale Ferroelectrics and Multiferroics by : Miguel Alguero
Download or read book Nanoscale Ferroelectrics and Multiferroics written by Miguel Alguero and published by John Wiley & Sons. This book was released on 2016-05-31 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dieses Buch beleuchtet die wichtigsten Aspekte der Verarbeitung und Charakterisierung von Ferroelektrika und Multiferroika auf Nanoebene, präsentiert eine umfassende Beschreibung der jeweiligen Eigenschaften und legt dabei den Schwerpunkt auf die Unterscheidung von Größeneffekten bei extrinsischen Eigenschaften wie Rand- oder Interface-Effekte. Eingegangen wird auch auf neuartige Nanoebene. Das Fachbuch ist in drei Abschnitte unterteilt und beschreibt die Verarbeitung (Nanostrukturierung), Charakterisierung (nanostrukturierter Materialien) und Nanoeffekte. Unter Rückgriff auf die Synergien zwischen Nano-Ferroelektrika und -Multiferroika werden Materialien behandelt, die auf allen Ebenen einer Nanostrukturierung unterzogen werden, von Technologien für keramische Materialien wie ferroelektrische Nanopulver, nanostrukturierte Keramiken und Dickschichten sowie magnetoelektrische Nanokomposit-Materialien bis hin zu freistehenden Nanoobjekten mit spezifischen Geometrien wie Nanodrähte und Nanoröhren auf verschiedenen Entwicklungsstufen. Grundlage des Buches ist die europäische Wissensplattform im Wissenschaftsbereich innerhalb der Aktion von COST (Europäische Zusammenarbeit in Wissenschaft und Technik) zu ein- und mehrphasigen Ferroika und Multiferroika mit begrenzten Geometrien (SIMUFER, Ref. MP0904). Die Autoren der Kapitelbeiträge wurden sorgfältig ausgewählt, haben allesamt ganz wesentlich zur Wissensbasis für das jeweilige Thema beigetragen und gehören vor allem zu den renommiertesten Wissenschaftlern des Fachgebiets.
Book Synopsis Control of Coupling Phenomena in Magnetic Nanostructures by : Wei-Yang Sun
Download or read book Control of Coupling Phenomena in Magnetic Nanostructures written by Wei-Yang Sun and published by . This book was released on 2015 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The search for non-volatile, non-dissipative computing devices (memory and logic) beyond current transistor technology has encouraged the scientific community to develop new nanoscale magnetic control mechanisms. In the present work, the control of magnets by magnetoelastic anisotropy is investigated within the context of nanoscale magnetoelectric composite systems. These magnetoelectric composites are artificial multiferroic materials which exhibit both a coexistence and coupling of ferromagnetic and ferroelectric ordering. This device architecture provides a route to control magnetism with electric fields via the application of mechanical stress. In the present work, magnetization behavior under mechanical stress of various magnetically coupled systems is investigated using both advanced computer simulations and experimental work. The application of voltage-controlled strain is shown to influence dipole coupled nanomagnet arrays and antiferromagnetic-ferromagnetic (AFM-FM) spontaneous exchange bias systems, which present pathways to engineered systems. Furthermore, the repeatable nature of these experiments presents unambiguous deterministic voltage control for both dipole-coupled systems and spontaneous exchange bias systems. The experimental results are confirmed by multiple characterization techniques, including superconducting quantum interference device magnetometry (SQUID) and magneto optic Kerr effect magnetometry (MOKE). This work thus provides significant evidence of the viability of magnetoelastic anisotropy as a means to control magnetoelectric heterostructures in future computing devices.
Book Synopsis Magnetoelectric Composites by : Mirza I. Bichurin
Download or read book Magnetoelectric Composites written by Mirza I. Bichurin and published by CRC Press. This book was released on 2019-02-22 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is dedicated to modeling and application of magnetoelectric (ME) effects in layered and bulk composites based on magnetostrictive and piezoelectric materials. Currently, numerous theoretical and experimental studies on ME composites are available but few on the development and research of instruments based on them. So far, only investigation of ME magnetic field sensors has been cited in the existing literature. However, these studies have finally resulted in the creation of low-frequency ME magnetic field sensors with parameters substantially exceeding the characteristics of Hall sensors. The book presents the authors’ many years of experience gained in ME composites and through creation of device models based on their studies. It describes low-frequency ME devices, such as current and position sensors and energy harvesters, and microwave ME devices, such as antennas, attenuators, filters, gyrators, and phase shifters.
Book Synopsis Dynamics of Multiferroic Coupling by : Sidhant Tiwari
Download or read book Dynamics of Multiferroic Coupling written by Sidhant Tiwari and published by . This book was released on 2020 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiferroics is a field that has rapidly garnered much interest in the past several years because of its establishment of a new unconventional class of electromagnetic devices. By capitalizing on a special class of material systems that have coupled magnetic and electrical properties, multiferroics offer unique possibilities for micromagnetic devices because of their ability to control magnetization with electric fields (and vice versa). Strain-coupled multiferroic composites, in particular, are promising because their magnetoelectric coupling is many orders-of-magnitude stronger than single-phase multiferroic materials. Telecommunication systems utilize dynamic magnetic processes for many applications, such as filters, nonreciprocal components, and electrically small antennas. These devices rely on electromagnetic waves for transduction, limiting their sizes and constraining their usage. Strain-coupled multiferroic composites utilize mechanical waves, leading to a five order-of-magnitude reduction in characteristic length and opening the door to device miniaturization. The dynamics of multiferroic coupling can be characterized into several different regimes that depend on the magnetic state of the composite (multi- or single domain) and the actuation frequency (relative to the domain wall relaxation and the ferromagnetic resonance frequencies). Miniaturization of dynamic magnetic devices relies on the thorough study of multiferroic coupling in these different regimes. In this work, the dynamics of multiferroic coupling in three different regimes are investigated. A variety of micro-scale piezoelectric devices are designed and fabricated to investigate coupling in each of these regimes. First, resonant cantilevers are used to study dynamic actuation in the regime of quasi-static domain wall motion. It is found that nonlinearity in this regime can lead to doubling of the actuation force frequency, a useful phenomenon for low noise electromagnetic characterization. Second, damping in thin film bulk acoustic resonators in a multi-domain state near ferromagnetic resonance is investigated, and the effect of the domain structure on the power absorption at resonance is characterized. Finally, the perturbations of acoustic Lamb waves caused by a single domain magnetic thin film are studied at frequencies above ferromagnetic resonance. Interactions with spin waves are found to lead to an angular dependence in the magneto-acoustic absorption. These results demonstrate several unique aspects of dynamic multiferroic coupling across different regimes and can be readily capitalized to develop novel micro-scale devices for telecommunication systems.
Book Synopsis Engineering Nano-Structured Multiferroic Thin Films by : Pui Lam Cheung
Download or read book Engineering Nano-Structured Multiferroic Thin Films written by Pui Lam Cheung and published by . This book was released on 2017 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiferroics exhibit remarkable tunabilities in their ferromagnetic, ferroelectric and magnetoelectric properties that provide the potential in enabling the control of magnetizations by electric field for the next generation non-volatile memories, antennas and motors. In recent research and developments in integrating single-phase ferroelectric and ferromagnetic materials, multiferroic composite demonstrated a promising magnetoelectric (ME) coupling for future applications. Atomic layer deposition (ALD) technique, on the other hand, allows fabrications of complex multiferroic nanostructures to investigate interfacial coupling between the two materials. In this work, radical-enhanced ALD of cobalt ferrite (CFO) and thermal ALD of lead zirconate titanate (PZT) were combined in fabricating complex multiferroic architectures in investigating the effect of nanostructuring and magnetic shape anisotropy on improving ME coupling. In particular, 1D CFO nanotubes and nanowires; 0D-3D CFO/PZT mesoporous composite; and 1D-1D CFO/PZT core-shell nanowire composite were studied. The potential implementation of nanostructured multiferroic composites into functioning devices was assessed by quantifying the converse ME coupling coefficient. The synthesis of 1D CFO nanostructures was realized by ALD of CFO in anodic aluminum oxide (AAO) membranes. This work provided a simple and inexpensive route to create parallel and high aspect ratio (~55) magnetic nanostructures. The change in magnetic easy axis of (partially filled) CFO nanotubes from perpendicular to parallel in (fully-filled) nanowires indicated the significance of the geometric factor in controlling magnetizations and ME coupling. The 0D-3D CFO/PZT mesoporous composite demonstrated the optimizations of the strain transfer could be achieved by precise thickness control. 100 nm of mesoporous PZT was synthesized on Pt/TiOx/SiO2/Si using amphiphilic diblock copolymers as a porous ferroelectric template (10 nm pore diameter) for ALD CFO growth. The increased filling of CFO decreased the mechanical flexibility of the composite for electric field induced strain, hence the converse ME coupling was mitigated. The highest converse ME coefficient of 1.2 10-5 Oe-cm/mV was achieved with a 33% pore filling of CFO, in compare to 1 i 10-5 Oe-cm/mV from mesoporous CFO filled with 3 nm of PZT in literature (Chien 2016). Highly directional 1D-1D PZT-core CFO-shell composite in AAO demonstrated the magnetic shape anisotropy could be modulated. The CFO shell thickness allowed the tuning of magnetic easy axis and saturation magnetizations; whereas the PZT volume allowed the optimization of electric field induced strain of the composite. Enhanced converse ME coupling of 1.3 i 10-4 Oe-cm/mV was realized by 5 nm CFO shell on 30 nm of PZT core. In summary, the work has demonstrated nanostructuring of multiferroic composite is an effective pathway to engineer converse ME coupling through optimizations of magnetic shape anisotropy and interfacial strain transfer.
Book Synopsis ON STRAIN-MEDIATED MAGNETOELEC by : Haitao Chen
Download or read book ON STRAIN-MEDIATED MAGNETOELEC written by Haitao Chen and published by Open Dissertation Press. This book was released on 2017-01-26 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "On Strain-mediated Magnetoelectric Effects in Multiferroic Composite Nanostructures" by Haitao, Chen, 陈海涛, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Multiferroics which combine two or more order parameters of ferroelectricity, ferromagnetism and ferroelasticity, have drawn great interests in the past few years due to their promising potential of application in sensors, transducers, spintronics and multistate memories. Coupling between the ferroelectricity and ferromagnetism renders the induction of an electric polarization P upon applying a magnetic field, or the induction of a magnetization M upon applying an electric field which is called magnetoelectric coupling effect. There are single phase multiferroics which simultaneously possess ferroelectricity and magnetism in nature. However, these natural multiferroics only exhibit weak magnetoelectric coupling effect at very low temperature which hinders the practical applications. An alternative and more promising choice is to fabricate multiferroic composites. In the multiferroic composite systems, large magnetoelectric coupling effects can be produced indirectly from the strain-mediated interaction even at room temperature and great design flexibility can be obtained. In the present study, two types of multiferroic composite nanostructures are investigated: the vertical heteroepitaxial multiferroic thin films and film-on-substrate heterogeneous bilayers with incorporation of various influences, such as film thickness, misfit strains and flexoelectricity. Since the first fabrication of vertical epitaxial multiferroic nanostructures, great scientific interests have been attracted for the potential large magnetoelectric effects arising from the relaxed substrate constraint and large interfacial area between the ferroelectric and ferromagnetic phases. A three dimensional phase field model is devised to precisely describe the complex strain state of this nanostructure. The simulation results demonstrate that both film thickness and misfit strains are important in determining the magnitude of magnetoelectric effect. Due to the strong strain-mediated magnetoelectric coupling effect in film-on-substrate system with a ferromagnetic thin film directly growing on a thick ferroelectric substrate, precision electric control of local ferromagnetism, i.e. ferromagnetic domain pattern and domain wall properties, are achievable. The results show that the domain pattern of the ferroelectric substrate can be fully transferred onto the as-deposited ferromagnetic thin film. High stability of the magnetic domain is observed when the system is subjected to an external magnetic field. Under an applied electric field, the transferred domain pattern in magnetic film can be either maintained or erased depending on the direction of applied electric field. Moreover, when a pulse of in-plane electric field is applied, the magnetic domain wall motion can be observed in concurrence with the ferroelectric domain wall motion. With the decrease of material size, some effects that can be neglected in bulk materials may play an important role on the overall properties of material, such as flexoelectric effects which describe the induction of polarization from strain gradient. A two dimensional phase field model is adopted to study the influence of flexoelectric effects on the epitaxial ferroelectric films. A thermodynamic phenomenological model is then utilized to analyze the influence of flexoelectric effects on magnetic field induced electric polarization in the multiferroic nanocomposite b
Book Synopsis Ferroic Properties in Individual and Multi-Component Nanostructures by : Stephanie Howell Johnson
Download or read book Ferroic Properties in Individual and Multi-Component Nanostructures written by Stephanie Howell Johnson and published by . This book was released on 2013 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extrinsic magnetoelectric heterostructure materials receive increased interest because of the potential to tune the magnetoelectric properties through material selection and actively, through applied electric and magnetic field. Understanding the strength of the coupling of ferroic properties in composite solids and the roles of size, shape, and arrangement of the constituent phases is central to realizing high-performance magnetoelectrics and their applications. Nanoscale magnetoelectric materials are excellent candidate systems to study the aforementioned effects of shape and finite size, to meet the growing demand for faster, more efficient, low cost, and above all smaller device components for use in advanced magnetic memories, actuators, transducers, and sensors. Nanoscale materials offer increased interfacial surface area compared with bulk, making them appealing in the design of an enhanced magnetoelectric composite because the magnetoelectric effect in a composite system is driven by interfacial coupling mechanisms. However, nanoscale (approximately 100 nm or less) ferroic materials often exhibit a dimensionality-dependent suppression of ferroic and piezoelectric properties below a critical size. By controlling e.g. the surface chemical environment, introducing strain engineering of films through epitaxy or through the shape of a nanostructure, the ferroelectric phase stability can be tuned for a given material and temperature. In this dissertation nanoscale ferroic and multiferroic properties were investigated, highlighting five characteristic systems: ferromagnetic nanoparticles, ferroelectric nanocubes, extrinsic magnetoelectric nanowires, and resonant beams and resonant membranes. An experimental study of ferromagnetic nanoparticles is presented to underscore the importance of understanding the growth and interfacial coupling mechanisms in ferromagnetic nanoparticle systems. To investigate the finite-size driven ferroelectric phase transition at the nanoscale, the functional properties of individual ferroelectric nanocubes of varying sizes were measured at elevated temperature using local ferroelectric piezoelectric amplitude and phase switching analysis. Experimental evidence of the direct magnetoelectric effect within a single integrated nanostructure is presented. The synthesis, fabrication, and functional property characterization of highly tunable magnetoelectric coupling within individual multiferroic nanowires is described. The direct magnetoelectric response is distinctively enhanced by extreme curvature of the ferroelectric shell in relation to planar heterostructures, the geometric dominance of the interface as a fraction of the total volume of the nanowire, and magnetic shape anisotropy of the ferromagnetic nanowire core. This study of geometry aided direct magnetoelectric coupling can help the development of a future study and design of a magnetoelectric proximity sensor. One solution to address the issues associated with current magnetic field sensors, such as cost, durability, and detection range, is to develop a mesoscale magnetoelectric resonator device. Magnetoelectric resonator structures have a resonant frequency which will shift in the presence of an applied magnetic field due to the magnetostrictive properties of the ferromagnetic material. The resonator detection range can be tuned by pre-straining the piezoelectric layer. Two suggested resonator designs which are promising candidates for magnetic field proximity sensors are the fixed-fixed beam design and the membrane design.
Book Synopsis Mechcomp2 by : Antonio J.M. Ferreira
Download or read book Mechcomp2 written by Antonio J.M. Ferreira and published by Società Editrice Esculapio. This book was released on 2016-05-20 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Composites materials have aroused a great interest over the last few decades. Several applications of fibrous composites, functionally graded materials, laminated composites, nano-structured reinforcements, morphing structures, can be found in many engineering fields, such as aerospace, mechanical, naval and civil engineering. The necessity of lightweight structures, smart and adaptive systems, high-level strength, have led both the academic research and the manufacturing development to a recurring employment of these materials. Many journal papers and technical notes have been published extensively over the last seventy years in international scientific journals of different engineering fields. For this reason, the establishment of this second edition of Mechanics of Composites International Conference has appeared appropriate to continue what has been begun during the first edition occurred in 2014 at Stony Brook University (USA). MECHCOMP wants to be an occasion for many researchers from each part of the globe to meet and discuss about the recent advancements regarding the use of composite structures. As a proof of this event, which has taken place in Porto (Portugal), selected plenary and key-note lectures have been collected in the present book.
Book Synopsis Integrated Multiferroic Heterostructures and Applications by : Ming Liu
Download or read book Integrated Multiferroic Heterostructures and Applications written by Ming Liu and published by John Wiley & Sons. This book was released on 2019-08-05 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Nanostructured Multiferroics by : Raneesh Balakrishnan
Download or read book Nanostructured Multiferroics written by Raneesh Balakrishnan and published by John Wiley & Sons. This book was released on 2021-06-01 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explore the state of the art in multiferroic materials with this cutting-edge resource Nanostructured Multiferroics delivers an overview of recent research developments in the area of nanostructured multiferroics, along with their preparation, characterization, and applications. Covering single-phase and composite multiferroics, nanomultiferroics, and multiferroic composites, the book explains their physical properties, the underlying physical principles, and the technology and application aspects of the materials, including energy harvesting and spintronics. With multiferroics undergoing a renaissance of renewed interest and development in the past few years, and with promising new breakthroughs in areas like superconductivity, spintronics, and quantum computing, Nanostructured Multiferroics offers both experienced scientists and young researchers inspirational and informative resources likely to spark ideas for further research. Along with chapters discussing topics such as the specific heat and magnetocaloric properties of manganite-based multiferroics for cryo-cooling applications and the multiferroic properties of barium-doped BiFeO3 particles, further topics are: * A comprehensive discussion about the physical properties of multiferroic nanocomposites * An exploration of the basic theory underpinning a variety of multiferroic interactions * An in-depth analysis of the engineering functionality in nanomultiferroics * An introduction to nanostructured multiferroics accompanied by discussions of their synthesis, characterization, and common applications * A treatment of multiferroic materials, as well as single-phase and composite multiferroics * An examination of the use of nanostructured multiferroics in the field of spintronics Perfect for materials scientists, Nanostructured Multiferroics will also earn a place in the libraries of solid-state physicists and chemists who seek to improve their understanding of the fundamentals of, and recent advances made in, multiferroics. The information contained within will inform anyone working in areas involving superconductivity, quantum computing, and spintronics.
Book Synopsis Magnetoelectric Polymer-Based Composites by : Senentxu Lanceros-Méndez
Download or read book Magnetoelectric Polymer-Based Composites written by Senentxu Lanceros-Méndez and published by John Wiley & Sons. This book was released on 2017-10-23 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first book on this topic provides a comprehensive and well-structured overview of the fundamentals, synthesis and emerging applications of magnetoelectric polymer materials. Following an introduction to the basic aspects of polymer based magnetoelectric materials and recent developments, subsequent chapters discuss the various types as well as their synthesis and characterization. There then follows a review of the latest applications, such as memories, sensors and actuators. The book concludes with a look at future technological advances. An essential reference for entrants to the field as well as for experienced researchers.
Book Synopsis Multiferroic Materials by : Junling Wang
Download or read book Multiferroic Materials written by Junling Wang and published by CRC Press. This book was released on 2016-10-14 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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.
Book Synopsis Magnetic, Ferroelectric, and Multiferroic Metal Oxides by : Biljana Stojanovic
Download or read book Magnetic, Ferroelectric, and Multiferroic Metal Oxides written by Biljana Stojanovic and published by Elsevier. This book was released on 2018-01-02 with total page 661 pages. Available in PDF, EPUB and Kindle. Book excerpt: Magnetic, Ferroelectric, and Multiferroic Metal Oxides covers the fundamental and theoretical aspects of ferroics and magnetoelectrics, their properties, and important technological applications, serving as the most comprehensive, up-to-date reference on the subject. Organized in four parts, Dr. Biljana Stojanovic leads expert contributors in providing the context to understand the material (Part I: Introduction), the theoretical and practical aspects of ferroelectrics (Part II: Ferroelectrics: From Theory, Structure and Preparation to Application), magnetic metal oxides (Part III: Magnetic Oxides: Ferromagnetics, Antiferromagnetics and Ferrimagnetics), multiferroics (Part IV: Multiferroic Metal Oxides) and future directions in research and application (Part V: Future of Metal Oxide Ferroics and Multiferroics). As ferroelectric materials are used to make capacitors with high dielectric constant, transducers, and actuators, and in sensors, reed heads, and memories based on giant magnetoresistive effects, this book will provide an ideal source for the most updated information. Addresses ferroelectrics, ferromagnetics and multiferroelectrics, providing a one-stop reference for researchers Provides fundamental theory and relevant, important technological applications Highlights their use in capacitors with high dielectric constant, transducers, and actuators, and in sensors, reed heads, and memories based on giant magnetoresistive effects
Book Synopsis Ferroelectric Domain Walls by : Jill Guyonnet
Download or read book Ferroelectric Domain Walls written by Jill Guyonnet and published by Springer Science & Business Media. This book was released on 2014-04-08 with total page 167 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Magnetoelectric Interaction Phenomena in Crystals by : Manfred Fiebig
Download or read book Magnetoelectric Interaction Phenomena in Crystals written by Manfred Fiebig and published by Springer Science & Business Media. This book was released on 2013-11-09 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the quest for higher data density in information technology manipulation of magnetization by other means than magnetic fields has become an important challenge. This lead to a startling revival of the magnetoelectric effect, which characterizes induction of a polarization by a magnetic field or of a magnetization by an electric field. The magnetoelectric crosslink of material properties opens just those degrees of freedom which are needed for the mutual control of magnetic and electric states. The book gives a state-of-the-art review on magnetoelectrics research, classifies current research tendencies, and points out possible future trends. Novel compounds and growth techniques and new theoretical concepts for the understanding of magnetoelectric coupling phenomena are introduced. Highlights are the discovery of "gigantic" magnetoelectric effects which are strong enough to trigger electric or magnetic phase transitions; the concept of magnetochirality; and development "structural" magnetoelectric effects in artificial multiphase compounds. The book is addressed to condensed-matter physicists with a particular focus on experts in highly correlated systems.
