Author: Dimosthenis KontosPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Microscopic Theory of Spin Wave Dynamics in Ferromagnetic Films
Author: Dimosthenis KontosSpin Dynamics and Damping in Ferromagnetic Thin Films and Nanostructures
Author: Anjan BarmanPublisher: Springer
ISBN: 9783319882130
Category : Technology & Engineering
Languages : en
Pages : 156
Book Description
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 and Magnetic Excitations
Author: Linear And Nonlinear Spin Waves In Magnetic Films And Superlattices
Author: M G CottamPublisher: World Scientific
ISBN: 981450548X
Category : Technology & Engineering
Languages : en
Pages : 475
Book Description
In the past few years, there has been a rapidly growing interest in the properties of spin waves (or magnons) in ordered magnetic materials. These are the low-lying excitations that characterize the dynamical behavior of the magnetization variables in ferromagnets, ferrimagnets and antiferromagnets, particularly at low temperatures. Many of the recent developments concerning spin waves have been directed towards understanding their behavior in limited magnetic samples. At the same time, there have been dramatic advances in the experimental techniques, both for preparing high-quality magnetic samples in the form of thin films and superlattices and for the study of the spin-wave excitations themselves. Magnetic thin films have long been of technological as well as scientific interest and an understanding of both the linear and nonlinear aspects of their magnetic behavior is important.
Propagation and Interference of Spin Waves in Ferromagnetic Thin Films
Author: Korbinian PerzlmaierPublisher:
ISBN: 9783832519049
Category :
Languages : en
Pages : 0
Book Description
This thesis deals with the propagation of spin waves in thin Ni80Fe20 films. Its specific aims are to experimentally determine a dispersion relation for propagating spin waves in thin ferromagnetic films, and to determine phase velocities, group velocities and damping. Additonally, an analytic dispersion relation based upon the linearized Landau-Lifshitz-Gilbert (LLG) equation is derived, from which the experimental findings can be reproduced using a theoretical model. Further on, this thesis reports on the direct observation of the interference of spin waves. This thesis is structured as follows: After an introduction in chapter 1, the basic principles of magnetostatics are sketched in chapter 2, followed by the principles of magnetodynamics in chapter 3. Based upon these principles, in chapter 4 a theory for the propagation of spin waves in ferromagnetic thin films is developed. The experimental part of this thesis begins with an overview of the experimental setup for Time Resolved Scanning Kerr Microscopy (TRSKEM) in chapter 5, and continues with the results of spin wave propagation and interference in chapter 6. The experimental results are compared to the theoretical predictions of the model developed in chapter 4. Chapter 7 gives a summary of the results and an outlook towards possible future developments. The appendix gives additional information on experimental and theoretical details.
Spin Wave Confinement
Author: Sergej O. DemokritovPublisher: Pan Stanford Publishing
ISBN: 9814241067
Category : Science
Languages : en
Pages : 240
Book Description
This book presents recent scientific achievements in the investigation of magnetization dynamics in confined magnetic systems. The book will be of value for scientists and engineers working on magnetic storage elements and magnetic logic, and is also suitable as an advanced textbook for graduate students.
Microscopic Theory of Exchange and Dipole-exchange Spin Waves in Magnetic Thin Films
Author: João Milton PereiraPublisher:
ISBN:
Category : Antiferromagnetism
Languages : en
Pages : 332
Book Description
Spin Waves
Author: Daniel D. StancilPublisher: Springer
ISBN: 9781441946058
Category : Technology & Engineering
Languages : en
Pages : 0
Book Description
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.
Theory of Spin Wave Excitations in Ferromagnetic Films
Author: R. C. MoulSpin Wave Technology
Author: George J. BughPublisher: Vasant Corporation
ISBN: 9780971661615
Category : Science
Languages : en
Pages : 268
Book Description
This is a book of informal research papers written by George J Bugh while investigating claims by many inventors and researchers who have built unusual electromagnetic devices said to produce anomalous energy output and even electrogravity effects.Mr. Bugh is a senior staff aerospace electronics engineer with over 20 years experience. He spent the last 7 years studying these claims to determine if any could be valid and if so then to determine the source of the anomalous energy and the electrogravity effects.According to classical electrodynamics, all electrically charged particles, like quarks and electrons, should radiate away energy from gyroscopic precessional motions and orbital motions. Bugh has come to the conclusion that they really do. However, all particles are also absorbing just as much energy from all other radiating particles.The continuously absorbed energy equals the radiated energy and applies forces that move similar type particles into harmonious precesssional motions with each other. This results in a sea of electromagnetic standing waves among all matter in the universe.It is this sea of standing waves rather than quantum probability waves that best account for the wave like nature of matter. Particles move to quantized states because of electromagnetic forces that keep particle motions synchronized with this sea of standing waves.This is an interaction among all matter that Ernst Mach alluded to as necessary to cause matter's characteristic of inertia. Einstein called this Mach's Principle. Einstein studied Mach's ideas while developing his theory of General Relativity.Using common sense and classical electrodynamics, Bugh explains how these particle spin interactions are possible even among compensating spins. Technology advancements are possible based on these particle spin interactions.