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Magnetic Proximity Effects In Highly Ordered Transition Metal Oxide Heterosystems A Study By Soft X Ray Photoemission Microscopy
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Book Synopsis Magnetic Proximity Effects in Highly-ordered Transition Metal Oxide Heterosystems - a Study by Soft-x-ray Photoemission Microscopy by : Ingo Peter Krug
Download or read book Magnetic Proximity Effects in Highly-ordered Transition Metal Oxide Heterosystems - a Study by Soft-x-ray Photoemission Microscopy written by Ingo Peter Krug and published by Forschungszentrum Jülich. This book was released on 2008 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Magnetism of Surfaces, Interfaces, and Nanoscale Materials by : Robert E. Camley
Download or read book Magnetism of Surfaces, Interfaces, and Nanoscale Materials written by Robert E. Camley and published by Elsevier. This book was released on 2015-10-27 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past 30 years, magnetic research has been dominated by the question of how surfaces and interfaces influence the magnetic and transport properties of nanostructures, thin films and multilayers. The research has been particularly important in the magnetic recording industry where the giant magnetoresistance effect led to a new generation of storage devices including hand-held memories such as those found in the ipod. More recently, transfer of spin angular momentum across interfaces has opened a new field for high frequency applications.This book gives a comprehensive view of research at the forefront of these fields. The frontier is expanding through dynamic exchange between theory and experiment. Contributions have been chosen to reflect this, giving the reader a unified overview of the topic. - Addresses both theory and experiment that are vital for gaining an essential understanding of topics at the interface between magnetism and materials science - Chapters written by experts provide great insights into complex material - Discusses fundamental background material and state-of-the-art applications, serving as an indispensable guide for students and professionals at all levels of expertise - Stresses interdisciplinary aspects of the field, including physics, chemistry, nanocharacterization, and materials science - Combines basic materials with applications, thus widening the scope of the book and its readership
Book Synopsis Complex Magnetic Nanostructures by : Surender Kumar Sharma
Download or read book Complex Magnetic Nanostructures written by Surender Kumar Sharma and published by Springer. This book was released on 2017-04-04 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a detailed discussion of the complex magnetic behavior of magnetic nanosystems, with its myriad of geometries (e.g. core-shell, heterodimer and dumbbell) and its different applications. It provides a broad overview of the numerous current studies concerned with magnetic nanoparticles, presenting key examples and an in-depth examination of the cutting-edge developments in this field. This contributed volume shares the latest developments in nanomagnetism with a wide audience: from upper undergraduate and graduate students to advanced specialists in both academia and industry. The first three chapters serve as a primer to the more advanced content found later in the book, making it an ideal introductory text for researchers starting in this field. It provides a forum for the critical evaluation of many aspects of complex nanomagnetism that are at the forefront of nanoscience today. It also presents highlights from the extensive literature on the topic, including the latest research in this field.
Book Synopsis Deutsche Nationalbibliografie by : Die deutsche Nationalbibliothek
Download or read book Deutsche Nationalbibliografie written by Die deutsche Nationalbibliothek and published by . This book was released on 2008 with total page 832 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Controlling Collective Electronic States in Cuprates and Nickelates by : Martin Bluschke
Download or read book Controlling Collective Electronic States in Cuprates and Nickelates written by Martin Bluschke and published by Springer Nature. This book was released on 2020-07-27 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis chemical and epitaxial degrees of freedom are used to manipulate charge and spin ordering phenomena in two families of transition metal oxides, while taking advantage of state-of-the-art resonant x-ray scattering (RXS) methods to characterize their microscopic origin in a comprehensive manner. First, the relationship of charge density wave order to both magnetism and the "pseudogap" phenomenon is systematically examined as a function of charge-carrier doping and isovalent chemical substitution in single crystals of a copper oxide high-temperature superconductor. Then, in copper oxide thin films, an unusual three-dimensionally long-range-ordered charge density wave state is discovered, which persists to much higher temperatures than charge-ordered states in other high-temperature superconductors. By combining crystallographic and spectroscopic measurements, the origin of this phenomenon is traced to the epitaxial relationship with the underlying substrate. This discovery opens new perspectives for the investigation of charge order and its influence on the electronic properties of the cuprates. In a separate set of RXS experiments on superlattices with alternating nickel and dysprosium oxides, several temperature- and magnetic-field-induced magnetic phase transitions are discovered. These observations are explained in a model based on transfer of magnetic order and magneto-crystalline anisotropy between the Ni and Dy subsystems, thus establishing a novel model system for the interplay between transition-metal and rare-earth magnetism.
Book Synopsis X-ray Emission Spectroscopy in Magnetic 3d-Transition Metals by :
Download or read book X-ray Emission Spectroscopy in Magnetic 3d-Transition Metals written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The application of high pressure affects the band structure and magnetic interactions in solids by modifying nearest-neighbor distances and interatomic potentials. While all materials experience electronic changes with increasing pressure, spin polarized, strongly electron correlated materials are expected to undergo the most dramatic transformations. In such materials, (d and f-electron metals and compounds), applied pressure reduces the strength of on-site correlations, leading to increased electron delocalization and, eventually, to loss of its magnetism. In this ongoing project, we study the electronic and magnetic properties of Group VIII, 3d (Fe, Co and Ni) magnetic transition metals and their compounds at high pressures. The high-pressure properties of magnetic 3d-transition metals and compounds have been studied extensively over the years, because of iron being a major constituent of the Earth's core and its relevance to the planetary modeling to understand the chemical composition, internal structure, and geomagnetism. However, the fundamental scientific interest in the high-pressure properties of magnetic 3d-electron systems extends well beyond the geophysical applications to include the electron correlation-driven physics. The role of magnetic interactions in the stabilization of the ''non-standard'' ambient pressure structures of Fe, Co and Ni is still incompletely understood. Theoretical studies have predicted (and high pressure experiments are beginning to show) strong correlations between the electronic structure and phase stability in these materials. The phase diagrams of magnetic 3d systems reflect a delicate balance between spin interactions and structural configuration. At ambient conditions, the crystal structures of [alpha]-Fe(bcc) and {var_epsilon}-Co(hcp) phases depart from the standard sequence (hcp → bcc→ hcp → fcc), as observed in all other non-magnetic transition metals with increasing the d-band occupancy, and are different from those of their 4d- and 5d-counter parts. This anomalous behavior has been interpreted in terms of the spin-polarized d-band altering the d-band occupancy [1]. At high pressures, however, the d-valence band is expected to broaden resulting in a suppression or even a complete loss of magnetism. Experimentally, ferromagnetic [alpha](bcc)-Fe has been confirmed to transform to non-magnetic {var_epsilon}-Fe (hcp) at 10 GPa [2,3]. Recently, we have also observed a similar transition in Co from ferromagnetic [alpha](hcp)-Co to likely nonmagnetic [beta](fcc)-Co at 105 GPa[4]. A similar structural phase transition is expected in Ni, probably in the second-order fcc-fcc transition. However, there has been no directly measured change in magnetism associated with the structural phase transition in Co, nor has yet been confirmed such an iso-structural phase transition in Ni. Similar electronic transitions have been proposed in these 3d-transition metal oxides (FeO, CoO and NiO) from high spin (magnetic) to low spin (nonmagnetic) states [5]. In each of these systems, the magnetic transition is accompanied by a first-order structural transition involving large volume collapse (10% in FeO, for example). So far, there have been no electronic measurements under pressure confirming these significant theoretical predictions, although the predicted pressures for the volume collapse transitions are within the experimental pressure range (80-200GPa).
Book Synopsis Photo-induced Phase Transition in Pr[1-x]Ca[x]MnO3 by : Yi Zhu
Download or read book Photo-induced Phase Transition in Pr[1-x]Ca[x]MnO3 written by Yi Zhu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important scientific challenges in condensed matter physics is to understand and ultimately control the emergent properties of complex materials, i.e. crystalline solids that are not well-described by single-electron band structure models. In such materials, unique and technologically relevant properties often emerge from strong interaction among electrons, and coupling between charge, spin, orbital, and vibrational (lattice) degrees of freedom. The focus of this thesis is on a model complex material, Pr[1-x]Ca[x]MnO3, and on the application of time-resolved x-ray techniques to advance our understanding of the physics that underlie the remarkable properties of this material.As an important member of transition metal oxides family, manganites have attracted huge research interest since the discovery of Colossal Magneto-Resistance (magnetic-field induced insulator-to-metal phase transition) phenomenon in 1950's. Pr[1-x]Ca[x]MnO3 is among the most studied manganite compounds since it exhibits the highest magneto-resistance ratio. Recently, it was found that the insulator-to-metal phase transition in this material can be induced through other external stimuli (in addition to magnetic field), such as pressure, electric field and even ultrafast laser excitation. This transient photo-induced phase transition in Pr[1-x]Ca[x]MnO3 (x=0.3) has been a hot research topic, not only because it has potential applications for future ultrafast data storage technology, but also because it provides a model system to study the physics of a strongly correlated system far away from its equilibrium state. Time-resolved optical spectroscopy and transport experiments have been previously used to study the photo-induced phase transition in Pr[1-x]Ca[x]MnO3 (x=0.3); however, the mechanism behind the phase transition is still an open question because the dynamics of the coupled lattice and electronic structure changes associated with the phase transition cannot be directly probed through traditional experimental methods. X-ray techniques have been indispensable experimental tools in studying the lattice and electronic structure of solid state materials. With the development of ultrafast time-resolved x-ray beamlines at synchrotron light sources and at x-ray free electron lasers, ultrafast time-resolved x-ray techniques have become more and more widely used to study structural dynamics in condensed matter systems. This thesis reports a series of experimental studies on the photo-induced phase transition in Pr[1-x]Ca[x]MnO3 (x=0.3, 0.5) by ultrafast time resolved x-ray spectroscopy and scattering techniques. New insight regarding the mechanism of the photo-induced phase transition in Pr[1-x]Ca[x]MnO3 (x=0.3, 0.5) is provided through these studies. Important background information is introduced in chapter 1, including the physics of manganites, the photo-induced phase transition, and the ultrafast x-ray experimental techniques used in this thesis. In chapters 2 and 3, x-ray absorption near edge spectroscopy is used to measure the electronic structure changes in Pr[0.7]Ca[0.3]MnO3 while it is undergoing an insulator to metal phase transition. The photo-induced electronic structure change is introduced in chapter 2, and the magnetic field induced electronic structure change is shown in chapter 3. The direct comparison between the two x-ray absorption spectra indicates that the photo-induced metallic phase in Pr[0.7]Ca[0.3]MnO3 is highly similar to the magnetic field induced metallic phase. Electronic excitation is the first step in photo-induced phase transitions in solid state materials. In order to elucidate the electronic excitation corresponding to the 1.5eV photon used to induce the phase transition, resonant inelastic x-ray scattering (RIXS) is used to measure the elementary excitations in Pr[0.5]Ca[0.5]MnO3. In chapter 4, temperature dependent RIXS studies at the Mn L-edge is introduced and a d-d transition is found around 1.5eV whose intensity is associated with the charge/orbital ordering melting process in Pr[0.5]Ca[0.5]MnO3. Chapters 5 and 6 present static and ultrafast time resolved resonant soft x-ray scattering studies of the electronic ordering in Pr[1-x]Ca[x]MnO3. Spin ordering is found to be dominant in the low temperature ground state of Pr[0.7]Ca[0.3]MnO3. An ultrafast "two step" melting process and glassy recovery dynamics of the spin ordering are found in Pr[0.7]Ca[0.3]MnO3. Based on the findings from all the experiments, a microscopic picture of spin-order melting from photo-induced inter-site d-d transitions is proposed to explain the photo-induced phase transition Pr[0.7]Ca[0.3]MnO3.Finally, chapter 7 summarizes the thesis, and discusses future directions on the research of strongly correlated materials via ultrafast x-ray techniques.
Book Synopsis Ordering and Dynamics of Strongly Correlated Transition Metal Oxides by : T. R. C. Forrest
Download or read book Ordering and Dynamics of Strongly Correlated Transition Metal Oxides written by T. R. C. Forrest and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a series of synchrotron based X-ray experiments on the lattice dynamics or magnetic ordering of several strongly correlated electron systems. Firstly, it will provide an introduction to the strongly correlated electron materials that were studied. After which a description of the experimental techniques used, specifically resonant X-ray scattering (RXS) and X-ray inelastic scattering (IXS), will be given. Finally the results of these experiments will be set out and evaluated. The experiments were as follows: X-ray inelastic scattering measurements on the effects of fluorine doping on the lattice dynamics of the newly discovered iron pnictide superconducting compound, SmFeAsO0.6F0.35 and its antiferromagnetic parent compound, SmFeAsO. The results from these experiments demonstrate the importance of antiferromagnetic fluctuations in understanding the lattice dynamics of this class of crystals. This result has been demonstrated for the '122' class of pnictide crystals, but until now has not been shown for the '1111' class of pnictides. Resonant X-ray scattering in the vicinity of the Mn L2 and L3 resonant enhancements was used to reassess the magnetic structure of multiferroic TbMnO3. The results indicate that the commonly accepted magnetic structure is modified, with additional a and c axis magnetic components. Therefore the ferroelectric polarisation in TbMnO3 arises from a phase transition between two non-collinear magnetic structures. It was previously believed that this phase transition was between a collinear and a non-collinear magnetic structure. Resonant X-ray scattering measurements were also taken on TbMnO3's sister compound, DyMnO3. Data was recorded at the Mn K and Dy L3 resonant enhancements. Several unidentified incommensurate reflections, independent of this compound's magnetic phases, were detected with photon energies close to the Mn K edge. What these reflections represent is still a mystery, although they do make a compelling case for further experimental work.
Book Synopsis Probing Dynamics of Complex Ordered Phases in Colossal Magnetoresistive Transition-metal Oxides Using Coherent Resonant Soft X-ray Scattering by : Joshua J. Turner
Download or read book Probing Dynamics of Complex Ordered Phases in Colossal Magnetoresistive Transition-metal Oxides Using Coherent Resonant Soft X-ray Scattering written by Joshua J. Turner and published by . This book was released on 2008 with total page 414 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis INVESTIGATIONS OF STRONGLY-CORRELATED COMPLEX METAL OXIDES AND INTERFACES USING SYNCHROTRON X-RAY SPECTROSCOPY by : Ravini Udeshika Chandrasena
Download or read book INVESTIGATIONS OF STRONGLY-CORRELATED COMPLEX METAL OXIDES AND INTERFACES USING SYNCHROTRON X-RAY SPECTROSCOPY written by Ravini Udeshika Chandrasena and published by . This book was released on 2019 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, we used a combination of several synchrotron-based x-ray spectroscopic techniques to investigate the effects of strain, ionic defect formation, and heteroengineering in strongly-correlated electronic systems. First, we introduce a method to control and stabilize oxygen vacancies in complex transition-metal oxide thin films. In our approach, we utilized atomic layer-by-layer pulsed laser deposition (ALL laser PLD) from two separate targets to synthesize high-quality single crystalline CaMnO3 films under coherent tensile strain, varying systematically from +0.8% to +4%. An increase of the oxygen vacancy content in the single-crystalline CaMnO3 thin films with applied in-plane strain was experimentally observed using high-resolution soft x-ray absorption spectroscopy (XAS) in conjunction with bulk-sensitive hard x-ray photoelectron spectroscopy (HAXPES). Our experimental results were verified using first-principles theory and atomic core-hole multiplet calculations. Furthermore, our results highlight the importance of protecting the surfaces of CaMnO3 thin-films with thin Pt layers in-situ in order to stabilize the oxygen vacancy content. Next, we discuss the role of oxygen vacancies in driving the metal-insulator transition in LaNiO3 thin films. Here, we also use atomic layer-by-layer pulsed laser deposition (ALL laser PLD) from two separate targets to synthesize high-quality single-crystalline LaNiO3 films with systematically varying thicknesses, ranging from 1 u.c. to 50 u.c. An increase in the oxygen vacancy content was observed with the decreasing LaNiO3 film thickness using XAS. A higher concentration of oxygen vacancies was observed for the ultrathin insulating films (
Book Synopsis Magnetic Heterostructures by : H. Zabel
Download or read book Magnetic Heterostructures written by H. Zabel and published by Springer. This book was released on 2007-10-26 with total page 373 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heterostructures consist of combinations of different materials, which are in contact through at least one interface. Magnetic heterostructures combine different physical properties which do not exist in nature. This book provides the first comprehensive overview of an exciting and fast developing field of research, which has already resulted in numerous applications and is the basis for future spintronic devices.
Book Synopsis Theory Of Superconductivity by : J. Robert Schrieffer
Download or read book Theory Of Superconductivity written by J. Robert Schrieffer and published by CRC Press. This book was released on 2018-03-05 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theory of Superconductivity is primarily intended to serve as a background for reading the literature in which detailed applications of the microscopic theory of superconductivity are made to specific problems.
Book Synopsis Organic Nanostructures for Next Generation Devices by : Katharina Al-Shamery
Download or read book Organic Nanostructures for Next Generation Devices written by Katharina Al-Shamery and published by Springer Science & Business Media. This book was released on 2007-12-29 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: This jaw-dropping window on the future is the first comprehensive overview of the fabrication, fundamental properties, and applications of a new class of nanoscaled organic materials. These materials offer incredible scope to scientists wanting to exploit their optical and electronic properties and offer the potential to create a new generation of tiny devices with powerful applications. Altogether, the book offers a unique integration of organic materials science basics, nanostructured organic materials fabrication, and device applications.
Book Synopsis X-Ray Absorption Spectroscopy of Semiconductors by : Claudia S. Schnohr
Download or read book X-Ray Absorption Spectroscopy of Semiconductors written by Claudia S. Schnohr and published by Springer. This book was released on 2014-11-05 with total page 367 pages. Available in PDF, EPUB and Kindle. Book excerpt: X-ray Absorption Spectroscopy (XAS) is a powerful technique with which to probe the properties of matter, equally applicable to the solid, liquid and gas phases. Semiconductors are arguably our most technologically-relevant group of materials given they form the basis of the electronic and photonic devices that now so widely permeate almost every aspect of our society. The most effective utilisation of these materials today and tomorrow necessitates a detailed knowledge of their structural and vibrational properties. Through a series of comprehensive reviews, this book demonstrates the versatility of XAS for semiconductor materials analysis and presents important research activities in this ever growing field. A short introduction of the technique, aimed primarily at XAS newcomers, is followed by twenty independent chapters dedicated to distinct groups of materials. Topics span dopants in crystalline semiconductors and disorder in amorphous semiconductors to alloys and nanometric material as well as in-situ measurements of the effects of temperature and pressure. Summarizing research in their respective fields, the authors highlight important experimental findings and demonstrate the capabilities and applications of the XAS technique. This book provides a comprehensive review and valuable reference guide for both XAS newcomers and experts involved in semiconductor materials research.
Book Synopsis Resistive Switching in Pt, TiO2, Pt by : Doo Seok Jeong
Download or read book Resistive Switching in Pt, TiO2, Pt written by Doo Seok Jeong and published by Forschungszentrum Jülich. This book was released on 2009 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoscale Magnetic Materials and Applications by : J. Ping Liu
Download or read book Nanoscale Magnetic Materials and Applications written by J. Ping Liu and published by Springer Science & Business Media. This book was released on 2010-04-05 with total page 731 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale Magnetic Materials and Applications covers exciting new developments in the field of advanced magnetic materials. Readers will find valuable reviews of the current experimental and theoretical work on novel magnetic structures, nanocomposite magnets, spintronic materials, domain structure and domain-wall motion, in addition to nanoparticles and patterned magnetic recording media. Cutting-edge applications in the field are described by leading experts from academic and industrial communities. These include new devices based on domain wall motion, magnetic sensors derived from both giant and tunneling magnetoresistance, thin film devices in micro-electromechanical systems, and nanoparticle applications in biomedicine. In addition to providing an introduction to the advances in magnetic materials and applications at the nanoscale, this volume also presents emerging materials and phenomena, such as magnetocaloric and ferromagnetic shape memory materials, which motivate future development in this exciting field. Nanoscale Magnetic Materials and Applications also features a foreword written by Peter Grünberg, recipient of the 2007 Nobel Prize in Physics.
Book Synopsis Semiconductor Spintronics by : Thomas Schäpers
Download or read book Semiconductor Spintronics written by Thomas Schäpers and published by Walter de Gruyter GmbH & Co KG. This book was released on 2021-05-10 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised and expanded edition of the first comprehensive introduction to the rapidly-evolving field of spintronics covers ferromagnetism in nano-electrodes, spin injection, spin manipulation, and the practical use of these effects in next-generation electronics. Moreover, the book now also includes spin-based optics, topological materials and insulators, and the quantum spin Hall effect.
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