Confined Magnon Modes And Anisotropic Exchange Interaction In Ultrathin Co Films
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Confined Magnon Modes And Anisotropic Exchange Interaction In Ultrathin Co Films
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Author : Ying-Jiun Chen
language : en
Publisher: Logos Verlag Berlin GmbH
Release Date : 2017
Confined Magnon Modes And Anisotropic Exchange Interaction In Ultrathin Co Films written by Ying-Jiun Chen and has been published by Logos Verlag Berlin GmbH this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Science categories.
A fundamental need in wireless communication and modern computer processors is to fabricate faster, smaller, and lower power-consumption circuits. A promising approach is the utilization of spin waves, or rather, magnons in ferromagnetic films. Quantum confinement in ultra-thin films permits the coexistence of several exchange-dominated magnon modes with terahertz-range frequencies and sub-nanometer length scales. By means of spin-polarized electron energy loss spectroscopy (SPEELS), these exchange-dominated terahertz magnons are directly probed in ultra-thin cobalt films on Ir(001), Cu(001) and Pt(111) single crystal surfaces. The dispersion relation of the quantized magnon modes depends particularly on the interatomic exchange interaction in individual layers. By tuning the exchange interaction, modes with opposite group velocities, and thus an opposite propagation direction of the wave packets, can be generated. Ab initio theoretical calculations as well as an analytical Heisenberg model reveal a spatial localization of the modes at the surface, interior, and interface of the film that opens an experimental access to the layer-dependent magnetic properties. In itinerant ferromagnets like cobalt the magnetic properties depend sensitively on many-body correlation effects in the electronic structure. Here, it is shown for the first time that spin-dependent correlations lead to a pronounced renormalization of the energy of the highest magnon mode by up to 260 meV, explaining the significant overestimation of theoretically predicted magnon energies and interatomic exchange interaction found in literature.
Physics Briefs
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Author :
language : en
Publisher:
Release Date : 1993
Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Physics categories.
Solid State Physics
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Author :
language : en
Publisher: Academic Press
Release Date : 2021-11-19
Solid State Physics written by and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-11-19 with Science categories.
Solid State Physics, Volume 72, the latest release in this long-running serial, highlights new advances in the field with this new volume presenting interesting and timely chapters authored by an international board of experts. Chapters in this release include Roadmap: The influence of the internal domain wall structure on spin wave band structure in periodic magnetic stripe domain patterns, The influence of the internal domain wall structure on spin wave band structure in periodic magnetic stripe domain patterns, and more. - Provides the authority and expertise of leading contributors from an international board of authors - Presents the latest release in the Solid State Physics series
Atomistic Spin Dynamics
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Author : Olle Eriksson
language : en
Publisher: Oxford University Press
Release Date : 2017-02-10
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 2017-02-10 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.
Recent Advances In Topological Ferroics And Their Dynamics
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Author : Robert L. Stamps
language : en
Publisher: Academic Press
Release Date : 2019-10-18
Recent Advances In Topological Ferroics And Their Dynamics written by Robert L. Stamps and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-10-18 with Technology & Engineering categories.
Recent Advances in Topological Ferroics and Their Dynamics, Volume 70 in the Solid State Physics series, provides the latest information on the branch of physics that is 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. - Contains contributions from leading authorities in the study of solid state physics, especially at the atomic level - Informs and updates on all the latest developments in the field - Presents timely, state-of-the-art reviews pertaining to all aspects of solid state physics
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.
Spin Dynamics And Damping In Ferromagnetic Thin Films And Nanostructures
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Author : Anjan Barman
language : en
Publisher: Springer
Release Date : 2017-12-27
Spin Dynamics And Damping In Ferromagnetic Thin Films And Nanostructures written by Anjan Barman and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-12-27 with Technology & Engineering categories.
This book provides a comprehensive overview of the latest developments in the field of spin dynamics and magnetic damping. It discusses the various ways to tune damping, specifically, dynamic and static control in a ferromagnetic layer/heavy metal layer. In addition, it addresses all optical detection techniques for the investigation of modulation of damping, for example, the time-resolved magneto-optical Kerr effect technique.
Spin Waves
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Author : Daniel D. Stancil
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-04-05
Spin Waves written by Daniel D. Stancil 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 2009-04-05 with Technology & Engineering categories.
This book begins by introducing magnetism and discusses magnetic properties of materials, magnetic moments of atoms and ions, and the elements important to magnetism. It covers magnetic susceptibilities and electromagnetic waves in anisotropic dispersive media among other topics. There are problems at the end of each chapter, many of which serve to expand or explain the material in the text. The bibliographies for each chapter give an entry to the research literature.
Magnetization Oscillations And Waves
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Author : Alexander G. Gurevich
language : en
Publisher: CRC Press
Release Date : 2020-12-17
Magnetization Oscillations And Waves written by Alexander G. Gurevich and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-12-17 with Science categories.
Written by two well-known researchers in the field, this useful reference takes an applied approach to high frequency processes including oscillations and waves in ferromagnets, antiferromagnets, and ferrimagnets. Problems evaluated include ferromagnetic and antiferromagnetic resonances, spin waves, nonlinear processes, and high frequency manifestations of interactions between the magnetic system and other systems of magnetically ordered substances as elastic waves and charge carriers. Unlike previous monographs on this subject, which are highly theoretical and written for very advanced readers, this book requires only an average college background in mathematics and experimental physics. It will be a valuable addition to the library of engineers and scientists in research and development for communications applications, and scientists interested in nonlinear magnetic phenomena. It also serves as an excellent introduction to the topic for newcomers in the field. Magnetization Oscillations and Waves not only presents results but also shows readers how to obtain them; most formulas are derived with so many details that readers can reproduce them. The book includes many summaries and tables and detailed references to significant work in the area by European researchers.
Quantum Theory Of Angular Momemtum
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Author : V K Khersonskii
language : en
Publisher: World Scientific
Release Date : 1988-10-01
Quantum Theory Of Angular Momemtum written by V K Khersonskii and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988-10-01 with Science categories.
This is the most complete handbook on the quantum theory of angular momentum. Containing basic definitions and theorems as well as relations, tables of formula and numerical tables which are essential for applications to many physical problems, the book is useful for specialists in nuclear and particle physics, atomic and molecular spectroscopy, plasma physics, collision and reaction theory, quantum chemistry, etc. The authors take pains to write many formulae in different coordinate systems thus providing users with added ease in consulting this book. Each chapter opens with a comprehensive list of its contents to ease the search for any information needed later. New results relating to different aspects of the angular momentum thoery are also included. Containing close to 500 pages this book also gathers together many useful formulae besides those related to angular momentum. The book also compares different notations used by previous authors.