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Induced Magnetoelectric Coupling At A Ferroelectric Ferromagnetic Interface
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Book Synopsis Induced Magnetoelectric Coupling at a Ferroelectric-ferromagnetic Interface by : Jeffrey David Carvell
Download or read book Induced Magnetoelectric Coupling at a Ferroelectric-ferromagnetic Interface written by Jeffrey David Carvell and published by . This book was released on 2013 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: Preparation and characterization of multiferroic materials in which ferroelectricity and ferromagnetism coexist would be a milestone for functionalized materials and devices. First, electric properties of polyvinylidene (PVDF) films fabricated using the Langmuir-Schaefer method have been studied. Films of different thickness were deposited on silicon substrates and analyzed using several techniques. X-ray diffraction (XRD) data showed that PVDF films crystallize at an annealing temperature above 130 °C. Polarization versus electric field (PE) ferroelectric measurements were done for samples prepared with electrodes. PE measurements show that the coercivity of the films increases as the maximum applied electric field increases. The coercivity dependence on the frequency of the applied electric field can be fitted as . The results also show that the coercivity decreases with increasing the thickness of PVDF film due to the pinning effect. Next, we have demonstrated that those PVDF properties can be controlled by applying an external magnetic field. Samples were created in a layered heterostructure, starting with a Fe thin film, PVDF above that, and followed by another thin film of Fe. Extended X-ray absorption fine structure (EXAFS) spectroscopy was used to study the interface between PVDF polymer films and ferromagnetic iron thin films. Conventional EXAFS was applied to identify the structure of a Fe film sandwiched between two PVDF layers. An electric signal was then applied to the polymer to study the effects polarizing the polymer has on the Fe atoms at the interface. This shows that the Fe atoms diffuse into the PVDF layer at the interface between the two layers. Polarizing the film causes further diffusion of Fe atoms into the polymer. We also found that as the applied magnetic field is changed, the switching of electric polarization for the PVDF displayed a dependence on the external magnetic field. We also noticed that both the coercivity and polarization for the PVDF polymer display hysteretic features as the applied magnetic field is changed. We also found that the thickness of both the iron layers and the PVDF layer has an effect on the magnetoelectric coupling in our samples. The same strain applied to a thicker PVDF layer becomes tougher to flip the polarization compared to a thinner PVDF layer. As the iron film thickness increases, the strain also increases, and the polarization of the PVDF polymer is more easily flipped. We also found that the magnetoelectric sensitivity increases as both the PVDF and iron layers increase in thickness. We have shown that it is possible to control the ferroelectric properties of a PVDF film by tuning the magnetic field in a heterostructure. Our experiments show a coupling between the electric polarization and applied magnetic field in multiferroic heterostructures much larger than any previously reported values. Previous reports have used inorganic materials for the ferroelectric layer. Organic polymers have an electric dipole originating at the molecular level due to atoms with different electronegativity that are free to rotate. To flip the polarization, the chains must rotate and the position of the atoms must change. This increases the force felt locally by those chains. Using this polymer, we are able to increase the magnetoelectric coupling.
Book Synopsis Magnetoelectric coupling at metal surfaces by : Gerhard, Lukas Leander
Download or read book Magnetoelectric coupling at metal surfaces written by Gerhard, Lukas Leander and published by KIT Scientific Publishing. This book was released on 2013-12-24 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, the development of magnetic data storage devices technique faces fundamental limitations which lead to a slow-down of the increase of areal storage density. Therefore, magnetoelectric coupling which allows to change the magnetic state of matter by means of an electric field attracted significant interest. In this work, scanning tunneling microscopy was used to show for the first time that magnetic information can be written on the nanometer scale by the application of electric fields.
Download or read book Ferroelectrics written by Indrani Coondoo and published by BoD – Books on Demand. This book was released on 2010-12-14 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectric materials exhibit a wide spectrum of functional properties, including switchable polarization, piezoelectricity, high non-linear optical activity, pyroelectricity, and non-linear dielectric behaviour. These properties are crucial for application in electronic devices such as sensors, microactuators, infrared detectors, microwave phase filters and, non-volatile memories. This unique combination of properties of ferroelectric materials has attracted researchers and engineers for a long time. This book reviews a wide range of diverse topics related to the phenomenon of ferroelectricity (in the bulk as well as thin film form) and provides a forum for scientists, engineers, and students working in this field. The present book containing 24 chapters is a result of contributions of experts from international scientific community working in different aspects of ferroelectricity related to experimental and theoretical work aimed at the understanding of ferroelectricity and their utilization in devices. It provides an up-to-date insightful coverage to the recent advances in the synthesis, characterization, functional properties and potential device applications in specialized areas.
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 Electric-Field Control of Magnetization and Electronic Transport in Ferromagnetic/Ferroelectric Heterostructures by : Sen Zhang
Download or read book Electric-Field Control of Magnetization and Electronic Transport in Ferromagnetic/Ferroelectric Heterostructures written by Sen Zhang and published by Springer Science & Business Media. This book was released on 2014-04-10 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book mainly focuses on the investigation of the electric-field control of magnetism and spin-dependent transportation based on a Co40Fe40B20(CoFeB)/Pb(Mg1/3Nb2/3)0.7Ti0.3O3(PMN-PT) multiferroic heterostructure. Methods of characterization and analysis of the multiferroic properties with in situ electric fields are induced to detect the direct magnetoelectric (ME) coupling. A switchable and non-volatile electric field control of magnetization in CoFeB/PMN-PT(001) structures is observed at room temperature, and the mechanism of direct coupling between the ferroelectric domain and ferromagnetic film due to the combined action of 109° ferroelastic domain switching in PMN-PT and the absence of magnetocrystalline anisotropy in CoFeB is demonstrated. Moreover, the electric-field control of giant magnetoresistance is achieved in a CoFeB-based spin valve deposited on top of (011) oriented PMN-PT, which offers an avenue for implementing electric-writing and magnetic-reading random access memory at room temperature. Readers will learn the basic properties of multiferroic materials, many useful techniques related to characterizing multiferroics and the interesting ME effect in CoFeB/PMN-PT structures, which is significant for applications.
Book Synopsis Magnetoelectricity in Composites by : Mirza Bichurin
Download or read book Magnetoelectricity in Composites written by Mirza Bichurin and published by CRC Press. This book was released on 2011-11-11 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together numerous contributions to the field of magnetoelectric (ME) composites that have been reported since the beginning of the new millennium. It presents assimilation of facts into the established knowledge, so that the potential of the field can be made transparent to the new generations of talent to advance the subject matter. This book discusses these bulk and nanostructured magnetoelectric composites from both experimental and theoretical perspectives. From application viewpoint, microwave devices, sensors, transducers, and heterogeneous read/write devices are among the suggested technical implementations of magnetoelectric composites.
Book Synopsis Magnetoelectric Coupling at Multiferroic Interfaces by : Michael Fechner
Download or read book Magnetoelectric Coupling at Multiferroic Interfaces written by Michael Fechner and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: When magnetism and ferroelectricity coexist in the same crystalline phase of a material it is called multiferroic. Furthermore, the crystal symmetry of a multiferroic material allows for magnetoelectric coupling which is quite useful since the coupling offers magnetization switching by an external electric field or electric polarization switching by an external magnetic field. In this thesis multiferroic interfaces are examined upon the occurrence of magnetoelectric coupling. Therefore first-principle methods based on density functional theory are used. The model system that are investigated consist of different ultrathin ferromagnetic films (Co and Fe) on top of ferroelectric ATiO3 (A=Pb, Ba) perovskites. The calculations show that at the interface a moderate change of the size of the total magnetization due to a change of the electric polarization occurs. Furthermore, the magnetic order of the Fe film is sensitive to its thickness, so an unexpected ferrimagnetic ordering appears for 2ML Fe whereas for all other thicknesses ferromagnetic ordering is preferred. Hybridization and strain effects at the interface explain the observations. Finally it is shown how the magnetic instability can be used to gain control of the magnetic ordering by the electric polarization.
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.
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 2017-06-21 with total page 284 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 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 2019-04-03 with total page 305 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 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.
Download or read book Ferroelectrics written by Mickaël Lallart and published by BoD – Books on Demand. This book was released on 2011-08-23 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ferroelectric materials have been and still are widely used in many applications, that have moved from sonar towards breakthrough technologies such as memories or optical devices. This book is a part of a four volume collection (covering material aspects, physical effects, characterization and modeling, and applications) and focuses on the underlying mechanisms of ferroelectric materials, including general ferroelectric effect, piezoelectricity, optical properties, and multiferroic and magnetoelectric devices. The aim of this book is to provide an up-to-date review of recent scientific findings and recent advances in the field of ferroelectric systems, allowing a deep understanding of the physical aspect of ferroelectricity.
Book Synopsis First-principles Study of Magnetoelectric Effects and Ferroelectricity in Complex Oxides by : Meng Ye
Download or read book First-principles Study of Magnetoelectric Effects and Ferroelectricity in Complex Oxides written by Meng Ye and published by . This book was released on 2016 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis contains several investigations of magnetoelectric effects and ferroelectricity in complex oxides studied via first-principles calculations. We start by reviewing the mechanisms of ferroelectricity and magnetoelectric e ffects, and then we give a brief introduction to the first-principles computational methods that are involved. Next, our investigations are divided into two parts. The first half focuses on the magnetoelectric effects, while the second half is mainly on ferroelectricity. The first half aims to examine the lattice contribution to the magnetoelectricity by investigating the dynamical magnetic charge tensors induced by different mechanisms. Through the study of Cr2O3 and a fictitious material KITPite, we find that the dynamical magnetic charges driven by exchange striction are more significant than the ones induced by spin-orbit coupling. Since the lattice contribution to the magnetoelectric effect is proportional to the dynamical magnetic charges, we also study the magnetic charges and the magnetoelectric coupling in hexagonal manganite RMnO3 and ferrite RFeO3. Our results further confirm the importance of the exchange-striction mechanism in inducing large magnetic charges, but we also notice that the magnetoelectric contributions from various phonons tend to cancel each other, leading to a great reduction of the total coupling. These investigations not only provide a prediction of the magnetoelectric coupling constant in RMnO3 and RFeO3, but also emphasize the importance of phonons in magnetoelectric coupling. In the second half of the thesis, we focus on predicting new ferroelectrics in the family of corundum derivatives. Many new corundum derivatives have been synthesized recently; these are automatically polar, and many are magnetic as well. However, a polar material is only called ferroelectric if the polarization is reversible by an external field, and it is not yet clear whether or not this is the case for these new materials. Motivated by this question, we use a structural constraint method to study the ferroelectric reversal path and energy barrier of several corundum derivatives. As a result, we predict several FE candidates with insulting reversal paths and low barrier energies. Since the hysteresis behavior of ferroelectrics is attributed to the ferroelectric domain wall motion, we further investigate the formation and motion of ferroelectric domain walls in corundum derivatives. Our study predicts the atomic structure and orientation of the ferroelectric domain wall, as well as the shape of ferroelectric domains. In addition, we fi nd novel properties at domain walls, including a strong magnetoelectric coupling and an interlocking between chirality and polarization. Moreover, we use the structural constraint method to study the barrier energy of ferroelectric domain wall reversal. Our results suggest that the barrier energy is linearly correlated with the bond valence sum, which can be used as a guide to find new ferroelectrics in the family of corundum derivatives.
Download or read book Multiferroics written by Andres Cano and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-06-21 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiferroics, materials with a coexistence of magnetic and ferroelectric order, provide an efficient route for the control of magnetism by electric fields. The authors cover multiferroic thin-film heterostructures, device architectures and domain/interface effects. They critically discuss achievements as well as limitations and assess opportunities for future applications.
Book Synopsis Exchange Bias by : Surender Kumar Sharma
Download or read book Exchange Bias written by Surender Kumar Sharma and published by CRC Press. This book was released on 2017-09-22 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: This timely book covers basic mechanisms, characterization, theoretical simulations, and applications for exchange bias in granular nanosystems, thin films, and bulk systems. After an overview of the field and key principles, the next section covers nanogranular (core-shell) systems, followed by chapters on thin films, bilayers/multilayers nanostructures, dilute magnetic semiconductors, and multiferroic systems. A final section turns to bulk systems, such as those consisting of perovskite structures, rare earth-transition metal intermetallic, and ion implantations. Readers of this book will obtain A complete, modern overview on exchange bias phenomena, covering synthesis, characterization techniques, and applications An introduction to all the important phenomenological models proposed for thin films, bulk materials, and nanoparticles Detailed discussion of the importance of size, shape, cooling field, and temperature on exchange bias properties Understanding of novel applications of exchange bias systems
Book Synopsis Physics and Technology of High-k Materials 9 by : S. Kar
Download or read book Physics and Technology of High-k Materials 9 written by S. Kar and published by The Electrochemical Society. This book was released on 2011 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Advanced Ferroelectricity by : Robert Blinc
Download or read book Advanced Ferroelectricity written by Robert Blinc and published by International Monographs on Ph. This book was released on 2011-08-25 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent exciting advances in the field of ferroelectricity have implications both for basic physics and for technological applications such as memory devices, spintronic applications and electro-optic devices, as well as in acoustics, robotics, telecommunications and medicine. This book provides a full account of recent developments in the field.
