Quantum Spin Transport And Collective Magnetic Dynamics In Heterostructures
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Quantum Spin Transport And Collective Magnetic Dynamics In Heterostructures
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Author : Scott Andrew Bender
language : en
Publisher:
Release Date : 2014
Quantum Spin Transport And Collective Magnetic Dynamics In Heterostructures written by Scott Andrew Bender and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
This thesis advances the theory of quantum and semiclassical transport in magnetic heterostructures. In the solid state, angular momentum can be carried by individual electrons and collective modes. The flow of angular momentum (a spin current), central to the operation of spintronic devices, is generated by the application of electric and magnetic fields and temperature gradients. In what follows, we explore the physics of such nonequilibrium spin currents in magnetic structures, involving an interplay of charge and magnetic dynamics and thermoelectric effects. Chapter 1 provides an introduction to the transport of spin in magnets, carried by electrons and collective excitations of the magnetic order. Chapters 2-6 study the role of thermal fluctuations in transport and magnetic dynamics. In Chapter 2, we describe how incoherent thermal fluctuations of the spin density (magnons), which open inelastic scattering channels, contribute to spin and energy transport between a normal metal and a magnet. Such (temperature-dependent) transport may arise from a thermal gradient applied across the metal/magnet interface or a spin accumulation inside the normal metal and may alter or even drive magnetic dynamics. Chapter 3, is dedicated to the realization of Bose-Einstein condensed magnons (previously observed by microwave pumping) in a normal metal/insulating ferromagnet heterostructure. As is described in Chapter 2, the combination of a temperature gradient and normal metal spin accumulation can drive spin into the insulating ferromagnet, accumulating as magnons; upon reaching a critical density, the magnons, which are bosonic, spontaneously form a quasi-equilibrium condensate. Chapter 4 focuses on thermally driven spin-torques in electrically insulating structures, wherein direct electric control of magnetic dynamics is prohibited. In contrast to the interfacial transport described in Chapter 2, where a spin accumulation is to necessary to observe magnetic dynamics, here we demonstrate how spin-torques can arise from a pure thermal gradient in a heterostructure. These spin-torques can be measured by ferromagnetic resonance and can, under a sufficiently strong bias, actuate magnetic switching. Chapter 5 concerns charge transport in a single-electron transistor, consisting of a magnetic quantum dot in contact with magnetic and normal metal leads. Microwave-driven precession by the dot induces a pumped electric current, which can be enhanced and made highly nonlinear by electron interactions (Coulomb blockade). The dependence of the resulting electrical response on the power and spectrum of microwave irradiation may be utilized to develop nanoscale microwave detectors analogous to single-electron transistor-based electrostatic sensors and nanoelectromechanical devices. In Chapter 6 we study bilayers, composed of a nonmagnetic conducting and a magnetic layer. We develop a general phenomenology for the magnetic and charge dynamics, which are coupled by spin-orbit interactions. In contrast to Chapters 2-4, we focus on the long-wavelength magnetic dynamics, which is subject to current-induced torques and produces fictitious electromotive forces that drive charge dynamics.}
Spin Dynamics In Confined Magnetic Structures I
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Author : Burkard Hillebrands
language : en
Publisher: Springer Science & Business Media
Release Date : 2001-11-06
Spin Dynamics In Confined Magnetic Structures I written by Burkard Hillebrands and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-11-06 with Science categories.
Introductory chapters help newcomers to understand the basic concepts, and the more advanced chapters give the current state of the art for most spin dynamic issues in the milliseconds to femtoseconds range. Emphasis is placed on both the discussion of the experimental techniques and on the theoretical work. The comprehensive presentation of these developments makes this volume very timely and valuable for every researcher working in the field of magnetism.
Magnetic Dynamics And Spin Currents In Quantum Spin Systems Strongly Coupled To Environment
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Author : Stefan Piotr Stagraczyński
language : en
Publisher:
Release Date : 2017*
Magnetic Dynamics And Spin Currents In Quantum Spin Systems Strongly Coupled To Environment written by Stefan Piotr Stagraczyński and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017* with categories.
Magnetic dynamics; Spin currents; Quantum Heisenberg model; Quantum state transfer; Topological insulator; Dilute semiconductor; Spin-orbit coupling;Many-body localization; Easy magnetization axis Strain
Real Time Transport Through Magnetic Quantum Dots
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Author : Daniel Becker
language : en
Publisher: Sudwestdeutscher Verlag Fur Hochschulschriften AG
Release Date : 2012-05
Real Time Transport Through Magnetic Quantum Dots written by Daniel Becker and has been published by Sudwestdeutscher Verlag Fur Hochschulschriften AG this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-05 with categories.
Quantum dots are versatile objects of research to explore fundamental questions of quantum physics and are promising candidates for the construction of novel spintronic devices. In particular, small magnetic dots manufactured from diluted magnetic semiconductors using standard lithographic methods, allow for an all-electrical control of the magnetisation and magnetic properties of spintronic devices. Quantum effects play an essential role in such systems. Yet, not many theoretical frameworks exist that allow to explore their correlated real-time dynamics beyond linear response and perturbation theory. What is the role of quantum correlations and how are they affected by the coupling of the quantum system to the macroscopic environment? To provide answers to these questions, the author Daniel Becker extends the method of iterative summation of path integrals (ISPI) to systems containing a quantum spin. This allows to study the interplay between (long-time) spin dynamics and the nonequilibrium charge current through small magnetic quantum dots even in the previously inaccessible regime, where all relevant energies are of the same order of magnitude.
Spin Current
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Author : Sadamichi Maekawa
language : en
Publisher: Oxford University Press
Release Date : 2017
Spin Current written by Sadamichi Maekawa and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Science categories.
In a new branch of physics and technology, called spin-electronics or spintronics, the flow of electrical charge (usual current) as well as the flow of electron spin, the so-called "spin current", are manipulated and controlled together. This book is intended to provide an introduction and guide to the new physics and applications of spin current.
Quantum Spin Transport In Paramagnetic Systems
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Author : Daniel Greenbaum
language : en
Publisher:
Release Date : 2005
Quantum Spin Transport In Paramagnetic Systems written by Daniel Greenbaum and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
We have studied the transport of magnetization and energy in systems of spins 1/2 on a lattice at high temperature. This work was motivated by recent experiments which observed "spin diffusion" among the dipolar coupled nuclear spins of the insulator calcium fluoride, under conditions where it was appropriate to neglect the coupling to any heat reservoir. The dynamics under these conditions is coherent and reversible, yet signatures of irreversibility (i.e. diffusion) are typically observed. This state of affairs poses a formidable conceptual puzzle. In this thesis we present both phenomenological and microscopic models of spin diffusion, retaining the important aspects of statistical approaches to transport while incorporating relevant quantum effects. These methods allow an efficient calculation of energy diffusion for a long- range interaction, which has largely been an intractable problem. We study transport in two different limits, that where the XY term of the spin Hamiltonian is dominant, and that where it can be treated as a perturbation compared to the Ising term. In the case of dipolar couping, both limits are found to show slightly more rapid diffusion of inter spin energy than magnetization, in qualitative agreement with experiments.
Ii Vi Semiconductor Materials And Their Applications
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Author : MariaC. Tamargo
language : en
Publisher: Routledge
Release Date : 2018-05-04
Ii Vi Semiconductor Materials And Their Applications written by MariaC. Tamargo and has been published by Routledge this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-04 with Technology & Engineering categories.
II-VI Semiconductor Materials and Their Applications deals with II-VI compound semiconductors and the status of the two areas of current optoelectronics applications: blue-green emitters and IR detectors. Specifically, the growth, charactrtization, materials and device issues for these two applications are described. Emphasis is placed on the wide bandgap emitters where much progress has occurred recently.The book also presents new directions that have potential, future applications in optoelectronics for II-VI materials. In particular, it discusses the status of dilute magnetic semiconductors for mango-optical and electromagnetic devices, nonlinear optical properties, photorefractive effects and new materials and physics phenomena, such as self-organized, low-dimensional structures.II_VI Semiconductor Materials and Their Applications is a valuable reference book for researchers in the field as well as a textbook for materials science and applied physics courses.
Dynamical Properties Of Unconventional Magnetic Systems
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Author : A.T. Skjeltorp
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Dynamical Properties Of Unconventional Magnetic Systems written by A.T. Skjeltorp and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Science categories.
Magnetism encompasses a wide range of systems and physical phenomena, and its study has posed and exposed both important fundamental problems and many practical applications. Recently, several entirely new phenomena have thus been discovered, generated through cooperative behaviour which could not have been predicted from a knowledge of `one-spin' states. At the same time, advances in sample preparation, experimental technique, apparatus and radiation sources, have led to increasing precision in the investigation and exposure of greater subtleties in magnetic thin films, multilayers and other systems. Examples of unexpected and conceptually new phenomena occur in strongly correlated and fluctuating quantum systems, producing effects such as Haldane and spin-Peierls gaps, solitons, quantum spin glasses and spin liquids. The discovery and elucidation of these `emerging properties' is a central theme in modern condensed matter physics. The present book comprises a series of chapters by world experts, covering both theoretical and experimental aspects. The approach is pedagogical and tutorial, but fully up to date, covering the latest research. The level is appropriate to graduate researchers who may either be just moving into the field or who are already active in condensed matter physics.
Oxford Handbook Of Nanoscience And Technology
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Author : A.V. Narlikar
language : en
Publisher: Oxford University Press
Release Date : 2010-02-11
Oxford Handbook Of Nanoscience And Technology written by A.V. Narlikar and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-02-11 with Language Arts & Disciplines categories.
These three volumes are intended to shape the field of nanoscience and technology and will serve as an essential point of reference for cutting-edge research in the field.
Atomistic Spin Dynamics
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Author : Olle Eriksson
language : en
Publisher: Oxford University Press
Release Date : 2017
Atomistic Spin Dynamics written by Olle Eriksson and has been published by Oxford University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Science categories.
The purpose of this book is to provide a theoretical foundation and an understanding of atomistic spin-dynamics (ASD), and to give examples of where the atomistic Landau-Lifshitz-Gilbert equation can and should be used. As argued in the text, a description of magnetism in an atomistic way is very natural and allows for an interpretation of experimental results in a clear and deep way. This description also allows for calculations, from first principles, of all parameters needed to perform the spin-dynamics simulations, without using experimental results as input to the simulations. As shown in the book, we are now at a very exciting situation, where it is possible to perform accurate and efficient atomistic simulations on a length- and time-scale which is balancing on the edge of what is experimentally possible. In this way, ASD simulations can both validate and be validated by state-of-the art experiments, and ASD simulations also have the possibility to act as a predictive tool that is able to explain the magnetization dynamics in experimentally inaccessible situations. The purpose of this book has been to communicate technically relevant concepts. An even larger motivation is to communicate an inspiration to magnetism and magnetization dynamics, and the emerging technological fields that one may foresee, e.g. in magnonics, solitonics and skyrmionics.