Micromagnetics
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Micromagnetics And Recording Materials
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Author : Dan Wei
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-04-28
Micromagnetics And Recording Materials written by Dan Wei 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 2012-04-28 with Technology & Engineering categories.
"Micromagnetics and Recording Materials" is a book trying to give a systematic theory of computational applied magnetism, based on Maxwell equations of fields and Landau-Lifshitz equations of magnetic moments. The focused magnetic materials are magnetic recording materials utilized in computer hard disk drives. Traditionally, “Micromagnetics” includes the areas of “magnetization curve theory", “domain theory" and “read and write process analyses in recording systems”. As Springer Briefs, this book includes the first two areas of micromagnetics. M-H loops of hard magnetic thin film media, soft magnetic layers and Tunneling MagnetoResistive spin valves are solved based on the microstructures of thin films. Static domain structures and dynamic switching processes are analyzed in the arbitrary-shaped magnetic devices such as write head pole tips and magnetic force microscope tips. The book is intended for researchers who are interested in applied magnetism and magnetic recording in all disciples of physical science. Prof. Dan Wei works at Tsinghua University, China.
Micromagnetics
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Author : William Fuller Brown
language : en
Publisher:
Release Date : 1963
Micromagnetics written by William Fuller Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Ferromagnetism categories.
Nanomagnetism And Spintronics
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Author : André Thiaville
language : en
Publisher: Elsevier Inc. Chapters
Release Date : 2013-10-07
Nanomagnetism And Spintronics written by André Thiaville and has been published by Elsevier Inc. Chapters this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-07 with Science categories.
Spin-transfer torque manifests itself in two main geometries, either submicrometer diameter pillars composed of magnetic multilayers, flooded by a current perpendicular to plane (CPP), or nanowires with current flowing in their plane (CIP). The first situation can be described rather well, from the magnetic point of view, in the framework of the macrospin model (see by Y. Suzuki). In the latter case, the typical situation is that of a magnetic domain wall under CIP current, with many internal degrees of freedom. In by H. Kohno and G. Tatara, a simplest model of the domain wall, called collective coordinates model, has been introduced to study this question. In this chapter, we will address the entire manifold of the degrees of freedom in the domain wall by micromagnetic numerical simulations, and apply this to the physics of CIP spin transfer in magnetic domain walls. We will consider soft magnetic materials only, where domain wall structures and dynamics are controlled by magnetostatics. This corresponds to the largest part of experiments that have been performed up to now, soft magnetic materials having generally lower coercive forces and domain wall propagation fields. The experimental counterpart to this chapter can be found in , by T. Ono and T. Shinjo. After briefly introducing micromagnetics and the typology of domain walls in samples shaped into nanostrips, we start by reviewing the field-driven dynamics in such samples. This situation was indeed considered first, historically, and led to the introduction of several useful concepts. Prominent among them are the separation between steady-state and precessional regimes, and the existence of a maximum velocity for a domain wall. The spin-transfer torque-induced domain wall dynamics will then be addressed, considering first the implementation of the CIP spin transfer torque in micromagnetics, with several components as introduced by theory. Comparison will be made to the field-driven case, with similarities and differences highlighted. In the nascent field of nanomagnetism and spintronics, micromagnetics can be considered to play the role of a translator. There are on one side experiments and on the other side theories about interaction between magnetization and spin-polarized electrical currents. Micromagnetics is a tool that translates the equations of the latter into quantitative predictions that can be compared to the former. Considering the present state of the subject of this book, with rapidly advancing experiments and theories, keeping in touch those two aspects of research is very important for its sound development. This is the objective of this chapter.
Relaxation Processes In Micromagnetics
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Author : Harry Suhl
language : en
Publisher: OUP Oxford
Release Date : 2007-06-21
Relaxation Processes In Micromagnetics written by Harry Suhl and has been published by OUP Oxford this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-06-21 with Science categories.
Electrons in solids behave like microscopic bar magnets, and in certain solids these align to produce macroscopic magnetizations. This book deals with the dynamics of this magnetization field. It addresses questions of microscopic mechanism only to the extent that residual interactions of the magnetic moments with other degrees of freedom of the host solid affect the dynamics, particularly the dissipative aspects. Several of these damping mechanisms are evaluated here for their effect on the equations of the magnetization dynamics. This dynamics is intrinsically nonlinear. This is important in the applications, particularly magnetic recording, which involves very large motion of the magnetization, well beyond the validity of linearized (small motion) approximations or limited extensions thereof. Therefore nonlinear solution methods are emphasized, but with only minimal use of numerical simulation. The book should be useful to practitioners of magnetic recording, and to physicists studying magnetic phenomena.
Micromagnetics
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Author : William Fuller Brown
language : en
Publisher:
Release Date : 1978
Micromagnetics written by William Fuller Brown and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Spin Arrangements And Crystal Structure Domains And Micromagnetics
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Author : George T. Rado
language : en
Publisher: Academic Press
Release Date : 2013-10-22
Spin Arrangements And Crystal Structure Domains And Micromagnetics written by George T. Rado and has been published by Academic Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-10-22 with Science categories.
Spin Arrangements and Crystal Structure, Domains, and Micromagnetics deals with cooperative phenomena characterized by ordered arrangements of magnetic moments subject to strong mutual interactions. The emphasis is on the ferromagnetism, ferrimagnetism, and antiferromagnetism of magnetically ordered materials such as insulators and metals. Both theoretical and experimental points of view are presented. Comprised of 12 chapters, this volume begins with an introduction to magnetism and crystal structure in nonmetals, followed by an evaluation of exchange interactions from experimental data. Subsequent chapters focus on the theory of neutron scattering by magnetic crystals; spin configuration of ionic structures; spin arrangements in metals; and permanent magnet materials. Fine particles, thin films, and exchange anisotropy are also considered, with particular reference to the effects of finite dimensions and interfaces on the basic properties of ferromagnets. The book also examines micromagnetics; domains and domain walls; the structure and switching of permalloy films; magnetization reversal in nonmetallic ferromagnets; and preparation and crystal synthesis of magnetic oxides. This book will be a useful resource for professionals and students with physics or chemistry backgrounds.
Micromagnetism And The Microstructure Of Ferromagnetic Solids
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Author : Helmut Kronmüller
language : en
Publisher: Cambridge University Press
Release Date : 2003-08-28
Micromagnetism And The Microstructure Of Ferromagnetic Solids written by Helmut Kronmüller and has been published by Cambridge University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003-08-28 with Science categories.
The main theme of this book is micromagnetism and microstructure as well as the analysis of the relations between characteristic properties of the hysteresis loop and microstructure. Also presented is an analysis of the role of microstructure in the fundamental magnetic properties (for example, magnetorestriction or critical behaviour) of crystalline and amorphous alloys. The authors apply the theory of micromagnetism to all aspects of advanced magnetic materials including domain patterns and magnetization processes under the influence of defect structures. Coverage includes modern developments in computational micromagnetism and its application to spin structures of small particles and platelets. It will be of interest to researchers and graduate students in condensed matter, physics, electrical engineering and materials science, as well as to industrial researchers working in the electrotechnical and recording industry.
The Science Of Hysteresis Physical Modeling Micromagnetics And Magnetization Dynamics
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Author : I. D. Mayergoyz
language : en
Publisher: Gulf Professional Publishing
Release Date : 2006
The Science Of Hysteresis Physical Modeling Micromagnetics And Magnetization Dynamics written by I. D. Mayergoyz and has been published by Gulf Professional Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Science categories.
Volume 1 covers: * Mathematical models * Differential equations * Stochastic aspects of hysteresis * Binary detection using hysteresis * Models of unemployment in economics Volume 2 covers: * Physical models of magnetic hysteresis * All aspects of magnetisation dynamics Volume 3 covers: * Hysteresis phenomena in materials * Over 2100 pages, rich with supporting illustrations, figures and equations * Contains contributions from an international list of authors, from a wide-range of disciplines * Covers all aspects of hysteresis - from differential equations, and binary detection, to models of unemployment and magnetisation dynamics.
Spin Arrangements And Crystal Structure Domains And Micromagnetics
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Author : George Tibor Rado
language : en
Publisher:
Release Date : 1963
Spin Arrangements And Crystal Structure Domains And Micromagnetics written by George Tibor Rado and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Magnetism categories.
Introduction To The Theory Of Ferromagnetism
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Author : Amikam Aharoni
language : en
Publisher: Oxford University Press
Release Date : 2000
Introduction To The Theory Of Ferromagnetism written by Amikam Aharoni 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 2000 with Science categories.
This second edition of Amikam Aharoni's Introduction to the Theory of Ferromagnetism is a textbook for first year graduate and advanced undergraduate students in physics and engineering as well as a reference book for practising engineers and experimental physicists who work in the field of magnetism. For this edition, the author has updated the material especially of chapters 9 ('The Nucleation Problem') and 11 ('Numerical Micro-magnetics'), which now contain the state of the art required by students and professionals who work on advanced topics of ferromagnetism.