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Magnetic Exchange Phenomena In Reduced Dimensions Studied By Neutron Scattering
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Book Synopsis Magnetic Exchange Phenomena in Reduced Dimensions Studied by Neutron Scattering by : Thomas Saerbeck
Download or read book Magnetic Exchange Phenomena in Reduced Dimensions Studied by Neutron Scattering written by Thomas Saerbeck and published by . This book was released on 2012 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] This thesis deals with magnetic exchange interactions in thin lm magnetic materials focusing on phenomena related to intrinsic parameters of magnetic, structural and chemical order. In particular, the investigation is of two magnetic thin film systems, a Cu0.94Mn0.06/Co multilayer displaying a temperature-dependent magnetic ordering due to exchange coupling originating from dilute paramagnetic Mn spins, and thin films of chemical order modulated FePt3, showing a unique self-exchange bias effect. Detailed real-space models of the magnetic structure are obtained using polarized neutron reffectometry and high-angle neutron diffraction, speciffcally chosen to probe interface and bulk magnetic characteristics, respectively, in connection with complementary structural and magnetic characterization tools. It will be discussed, how the random distribution of dilute magnetic impurity centers in the Cu0.94Mn0.06/Co multilayers leads to a temperature-dependent interlayer exchange coupling with a strong biquadratic component. This manifests in an in-plane magnetic domain structure with a canted magnetization, i.e. a deviation from collinear alignments of external magnetic field and magnetization. The domain magnetizations show a high degree of vertical correlation in the form of columns throughout the multilayer, in which the sense of canting alternates in sign for each subsequent magnetic layer. Detailed analysis of temperature and field dependences of the magnetic structure lead to fundamental exchange energies, which are utilized in constructing a phenomenological model of exchange interactions between dilute magnetic impurities and the ferromagnetic layers. In addition to this, the second study deals with the effect of chemical order of the constituent atoms in the alloy FePt3 on the magnetic order on atomic and sub-micrometer scales. Depending on the long-range chemical order, ferromagnetic or antiferromagnetic grains exist below the respective transition temperatures. As such, the system constitutes a new way of controlling the magnetic composition of thin lms without changing the materials composition, stoichiometry or lattice structure. The interfacing of the two magnetic grains leads to the observation of a unique self-exchange bias effect. Based on studies in thin films of FePt3 with varying degree of chemical order and the evolution of exchange bias with respect to interface and volume of the chemically ordered grains, a mono-stoichiometric FePt3 ferromagnetic/antiferromagnetic multilayer is presented. Analysis of the magnetic structure in the arti cially layered thin film elucidates the magnetic composition and origin of the observed exchange bias. Due to the unique mono-stoichiometric structure, the system opens possibilities to study magnetic phenomena in perfect lattice-matched systems...
Book Synopsis Neutron Scattering from Magnetic Materials by : Tapan Chatterji
Download or read book Neutron Scattering from Magnetic Materials written by Tapan Chatterji and published by Elsevier. This book was released on 2005-11-29 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neutron Scattering from Magnetic Materials is a comprehensive account of the present state of the art in the use of the neutron scattering for the study of magnetic materials. The chapters have been written by well-known researchers who are at the forefront of this field and have contributed directly to the development of the techniques described. Neutron scattering probes magnetic phenomena directly. The generalized magnetic susceptibility, which can be expressed as a function of wave vector and energy, contains all the information there is to know about the statics and dynamics of a magnetic system and this quantity is directly related to the neutron scattering cross section. Polarized neutron scattering techniques raise the sophistication of measurements to even greater levels and gives additional information in many cases. The present book is largely devoted to the application of polarized neutron scattering to the study of magnetic materials. It will be of particular interest to graduate students and researchers who plan to investigate magnetic materials using neutron scattering. · Written by a group of scientist who have contributed directly in developing the techniques described.· A complete treatment of the polarized neutron scattering not available in literature.· Gives practical hits to solve magnetic structure and determine exchange interactions in magnetic solids.· Application of neutron scattering to the study of the novel electronic materials.
Book Synopsis Neutron Scattering Study of Critical Phenomena in Low-dimensional Magnets by : Hironobu Ikeda
Download or read book Neutron Scattering Study of Critical Phenomena in Low-dimensional Magnets written by Hironobu Ikeda and published by . This book was released on 1974 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Angle Polarized Neutron and X-Ray Scattering from Magnetic Nanolayers and Nanostructures by : Amitesh Paul
Download or read book Low-Angle Polarized Neutron and X-Ray Scattering from Magnetic Nanolayers and Nanostructures written by Amitesh Paul and published by Springer. This book was released on 2017-08-12 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This research monograph presents the latest results related to the characterization of low dimensional systems. Low-angle polarized neutron scattering and X-ray scattering at grazing incidence are used as the two main techniques to explore various physical phenomena of these systems. Special focus is put on systems like thin film transition metal and rare-earth layers, oxide heterostructures, hybrid systems, self-assembled nanostructures and self-diffusion. Readers will gain in-depth knowledge about the usage of specular scattering and off-specular scattering techniques. Investigation of in-plane and out-of-plane structures and magnetism with vector magnetometric information is illustrated comprehensively. The book caters to a wide audience working in the field of nano-dimensional magnetic systems and the neutron and X-ray reflectometry community in particular.
Book Synopsis Low-Dimensional Cooperative Phenomena by : H. J. Keller
Download or read book Low-Dimensional Cooperative Phenomena written by H. J. Keller and published by Springer. This book was released on 2013-12-01 with total page 353 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical and experimental work on solids with low-dimensi℗Ư onal cooperative phenomena has been rather explosively expanded in the last few years, and it seems to be quite fashionable to con℗Ư tribute to this field, especially to the problem of one-dimensional metals. On the whole, one could divide the huge amount of recent investigations into two parts although there is much overlap bet℗Ư ween these regimes, namely investigations on magnetic exchange interactions constrained to mainly one or two dimensions and, secondly, work done on Id metallic solids or linear chain compounds with Id delocalized electrons. There is, of course, overlap from one extreme case to the other with these solids and in some rare cases both phenomena are studied on one and the same crystal. In fact, however, most of the scientific groups in this area could be associated roughly with one of these categories and, in addition, a separation between theoreticians and experimentalists in each of these groups leads to a further splitting of interests although many theories about these solids have been tested by experimenta℗Ư lists. Nevertheless, more cooperation and understanding between scientists working on low-dimensional cooperative phenomena should appreciably stimulate further development. With a better inderdis℗Ư ciplinary understanding, new ideas could possibly help chemists in synthesizing tailor-cut solids. This would in return give experi℗Ư mentalists new phenomena to examine and finally would stimulate new theoretical work.
Book Synopsis Magnetic Neutron Scattering: Proceedings Of The Third Summer School On Neutron Scattering by : Albert Furrer
Download or read book Magnetic Neutron Scattering: Proceedings Of The Third Summer School On Neutron Scattering written by Albert Furrer and published by World Scientific. This book was released on 1995-10-12 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings provide a topical survey of the static and dynamical magnetic properties of condensed matter studied by neutron scattering which has been the key technique in this field for a long time. The static aspects deal with the determination of long-range ordered spin structures and magnetization densities. The dynamic aspects concentrate on the determination of magnetic excitations such as spin waves and crystal-field transitions. The use of polarized-neutron techniques is particularly emphasized. All these topics are thoroughly introduced, methodically discussed, and highlighted with recent experimental results obtained for a vast variety of magnetic materials (e.g., strongly correlated electron systems, multilayers, nanocrystals, molecular complexes, etc.) by acknowledged experts. Other experimental methods (x-ray scattering, muon spin rotation) in the study of magnetism are compared to neutron scattering.
Book Synopsis Theory of Magnetic Neutron and Photon Scattering by : Ewald Balcar
Download or read book Theory of Magnetic Neutron and Photon Scattering written by Ewald Balcar and published by Clarendon Press. This book was released on 1989-01-19 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: The techniques of magnetic neutron and photon scattering provide information on the electronic properties of materials that is obtainable in no other way. With both techniques information on an atomic scale is obtained on the spatial and temporal developments of the spin and current densities which are fundamental quantities in a basic understanding of magnetic phenomena. To date most magnetic scattering studies have used neutron beams, and the use of photon beams is, relatively speaking, in its infancy. This book is the first monograph devoted to the theory required for a full interpretation of magnetic scattering experiments. It is designed to meet the needs of postgraduates and researchers new to the techniques. At the same time, the requirements of theoretical chemists and physicists are catered for through chapters that present the basic formalism in detail. Special features of the book include extensive tables of quantities that occur frequently in applications of theory, and a number of worked examples.
Book Synopsis Magnetoelectric Response in Low-Dimensional Frustrated Spin Systems by : Shinichiro Seki
Download or read book Magnetoelectric Response in Low-Dimensional Frustrated Spin Systems written by Shinichiro Seki and published by Springer Science & Business Media. This book was released on 2012-08-27 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Electric control of magnetic properties, or inversely, magnetic control of dielectric properties in solids, is called a magnetoelectric effect and has long been investigated from the point of view of both fundamental physics and potential application. Magnetic and dielectric properties usually show minimal coupling, but it recently has been discovered that magnetically induced ferroelectricity in some spiral magnets enables remarkably large and versatile magnetoelectric responses. To stabilize such helimagnetism, magnetic frustration (competition between different magnetic interactions) is considered the key. In the present work, two of the most typical frustrated spin systems—triangular lattice antiferromagnets and edge-shared chain magnets—have systematically been investigated. Despite the crystallographic simplicity of target systems, rich magnetoelectric responses are ubiquitously observed. The current results published here offer a useful guideline in the search for new materials with unique magnetoelectric functions, and also provide an important basis for a deeper understanding of magnetoelectric phenomena in more complex systems.
Book Synopsis Neutron Scattering Studies on Low-dimensional Quantum Magnets by : Chiron Jeeb Mukherjee
Download or read book Neutron Scattering Studies on Low-dimensional Quantum Magnets written by Chiron Jeeb Mukherjee and published by . This book was released on 2005 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Studies of Low-dimensional Quantum Magnets by : David Macdougal
Download or read book Neutron Scattering Studies of Low-dimensional Quantum Magnets written by David Macdougal and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering in Layered Copper-Oxide Superconductors by : Albert Furrer
Download or read book Neutron Scattering in Layered Copper-Oxide Superconductors written by Albert Furrer and published by Springer Science & Business Media. This book was released on 1998-09-30 with total page 428 pages. Available in PDF, EPUB and Kindle. Book excerpt: The phenomenon of superconductivity - after its discovery in metals such as mercury, lead, zinc, etc. by Kamerlingh-Onnes in 19]] - has attracted many scientists. Superconductivity was described in a very satisfactory manner by the model proposed by Bardeen, Cooper and Schrieffer, and by the extensions proposed by Abrikosov, Gorkov and Eliashberg. Relations were established between superconductivity and the fundamental properties of solids, resulting in a possible upper limit of the critical temperature at about 23 K. The breakthrough that revolutionized the field was made in 1986 by Bednorz and Muller with the discovery of high-temperature superconductivity in layered copper-oxide perovskites. Today the record in transition temperature is 133 K for a Hg based cuprate system. The last decade has not only seen a revolution in the size of the critical temperature, but also in the myriads of research groups that entered the field. In addition, high-temperature superconductivity became a real interdisciplinary topic and brought together physicists, chemists and materials scientists who started to investigate the new compounds with almost all the available experimental techniques and theoretical methods. As a consequence we have witnessed an avalanche of publications which has never occurred in any field of science so far and which makes it difficult for the individual to be thoroughly informed about the relevant results and trends. Neutron scattering has outstanding properties in the elucidation of the basic properties of high-temperature superconductors.
Book Synopsis Neutron Scattering Studies of Low Dimensional Magnetic Systems by :
Download or read book Neutron Scattering Studies of Low Dimensional Magnetic Systems written by and published by . This book was released on 2017 with total page 211 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Solid State Physics written by and published by Academic Press. This book was released on 2014-05-15 with total page 629 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid state physics is the branch of physics primarily devoted to the study of matter in its solid phase, especially at the atomic level. This prestigious serial presents timely and state-of-the-art reviews pertaining to all aspects of solid state physics. Contributions from leading authorities Informs and updates on all the latest developments in the field
Book Synopsis Elements of Slow-Neutron Scattering by : J. M. Carpenter
Download or read book Elements of Slow-Neutron Scattering written by J. M. Carpenter and published by Cambridge University Press. This book was released on 2015-09-24 with total page 539 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive and up-to-date introduction to the fundamental theory and applications of slow-neutron scattering.
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Neutron Scattering Investigations of Zero- and One-dimensional Quantum Magnets by : Oliver Pieper
Download or read book Neutron Scattering Investigations of Zero- and One-dimensional Quantum Magnets written by Oliver Pieper and published by . This book was released on 2010 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with the investigation of two different types of low-dimensional quantum magnets using the technique of neutron scattering.In the first part, the magnetic properties of three Mn_6-based single molecule magnets are explored by means of inelastic neutron scattering. The experimental data reveal that small structural distortions of the molecular geometry produce a significant effect on the energy level diagram and therefore on the magnetic properties of the molecules. It will be shown that the giant spin model completely fails to describe the spin level structure of the ground spin multiplets and that the excited S-multiplets play a key role in determining the effective energy barrier for the magnetization reversal.The second part of this thesis presents an in-depth study of the nuclear and magnetic properties of the quasi-one-dimensional Heisenberg antiferromagnet CaV_2O_4. The magnetism in this system arises from the partially filled t_{2g-levels of the V^{3+-ions, which in addition give an orbital degree of freedom to the system.Single crystal and powder neutron diffraction as well as neutron spectroscopy are used to determine the nuclear and magnetic structure as well as the complex excitation spectrum of CaV_2O_4. The results are analysed theoretically and from this the leading exchange paths are deduced and discussed in terms of orbital ordering.
Book Synopsis Dynamical Properties of Unconventional Magnetic Systems by : Arne Skjeltorp
Download or read book Dynamical Properties of Unconventional Magnetic Systems written by Arne Skjeltorp and published by Springer. This book was released on 1998-06-30 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains 16 lectures presented at the April 1997 institute which addressed the current experimental and theoretical knowledge of the co-operative phenomena, fluctuations, and excitations in unconventional magnetic systems including low-dimensional and mesoscopic magnetism, novel ground states, quantum magnets, and soft matter. Some sample topics are: dynamics and transport near quantum-critical points, spin spectroscopy and coherence in magnetic quantum structures, the magnetic structures of rare-earth superlattices, low energy spin excitations in chromium metal, and aging in frustrated magnets. Annotation copyrighted by Book News, Inc., Portland, OR
