Magnetoelastic and Magnetostatic Waves in Time Varying Magnetic Fields PDF Download
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Author: Sergio Machado Rezende
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages : 133
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Book Description
The propagation of microwave magnetoelastic and magnetostatic waves in a ferromagnet subjected to pulsed magnetic fields is investigated both theoretically and experimentally. In the first part of the theoretical analysis, which is restricted to spatially uniform bias fields, the coupling between the magnetic and elastic systems is neglected. Using a coupled mode approach, it is found that plane spin waves propagate in magnetic field transients with negligible reflections, constant momentum and wavenumber, but variable frequency and power flow. These results are further elucidated by the study of a simple step transient case. The analysis is also extended to magnetostatic modes propagating in axially magnetized cylinders. In the presence of magnetoelastic interaction, the theory indicates that besides changes in frequency and in power flow, the field gradient causes group velocity modulation and changes in the time duration of wave packets. In addition there is an exchange of momentum between the different branches of the dispersion relation; this exchange is calculated in terms of critical field gradients. These critical gradients are given for both shear and longitudinal waves propagating along certain crystallographic directions. Experiments with magnetoelastic pulses in axially magnetized YIG rods confirm the theoretical predictions. (Author).
Author: Sergio Machado Rezende
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages : 133
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Book Description
The propagation of microwave magnetoelastic and magnetostatic waves in a ferromagnet subjected to pulsed magnetic fields is investigated both theoretically and experimentally. In the first part of the theoretical analysis, which is restricted to spatially uniform bias fields, the coupling between the magnetic and elastic systems is neglected. Using a coupled mode approach, it is found that plane spin waves propagate in magnetic field transients with negligible reflections, constant momentum and wavenumber, but variable frequency and power flow. These results are further elucidated by the study of a simple step transient case. The analysis is also extended to magnetostatic modes propagating in axially magnetized cylinders. In the presence of magnetoelastic interaction, the theory indicates that besides changes in frequency and in power flow, the field gradient causes group velocity modulation and changes in the time duration of wave packets. In addition there is an exchange of momentum between the different branches of the dispersion relation; this exchange is calculated in terms of critical field gradients. These critical gradients are given for both shear and longitudinal waves propagating along certain crystallographic directions. Experiments with magnetoelastic pulses in axially magnetized YIG rods confirm the theoretical predictions. (Author).
Author: Sergio Machado Rezende
Publisher:
ISBN:
Category : Elasticity
Languages : en
Pages : 34
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Book Description
Author: Sergio M. Rezende
Publisher: Springer Nature
ISBN: 3030413179
Category : Science
Languages : en
Pages : 372
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Book Description
Fundamentals of Magnonics is a textbook for beginning graduate students in the areas of magnetism and spintronics. The level of presentation assumes only basic knowledge of the origin of magnetism and electromagnetism, and quantum mechanics. The book utilizes elementary mathematical derivations, aimed mainly at explaining the physical concepts involved in the phenomena studied and enabling a deeper understanding of the experiments presented. Key topics include the basic phenomena of ferromagnetic resonance in bulk materials and thin films, semi-classical theory of spin waves, quantum theory of spin waves and magnons, magnons in antiferromagnets, parametric excitation of magnons, nonlinear and chaotic phenomena, Bose-Einstein condensation of magnons, and magnon spintronics. Featuring end-of-chapter problem sets accompanied by extensive contemporary and historical references, this book provides the essential tools for any graduate or advanced undergraduate-level course of studies on the emerging field of magnonics.
Author: Stanford University. Microwave Laboratory
Publisher:
ISBN:
Category :
Languages : en
Pages : 214
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Book Description
Author: Dikshitulu K. Kalluri
Publisher: CRC Press
ISBN: 1439817073
Category : Technology & Engineering
Languages : en
Pages : 556
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Book Description
Completely revised and updated to reflect recent advances in the fields of materials science and electromagnetics, Electromagnetics of Time Varying Complex Media, Second Edition provides a comprehensive examination of current topics of interest in the research community—including theory, numerical simulation, application, and experimental work. Written by a world leader in the research of frequency transformation in a time-varying magnetoplasma medium, the new edition of this bestselling reference discusses how to apply a time-varying medium to design a frequency and polarization transformer. This authoritative resource remains the only electromagnetic book to cover time-varying anisotropic media, Frequency and Polarization Transformer based on a switched magnetoplasma medium in a cavity, and FDTD numerical simulation for time-varying complex medium. Providing a primer on the theory of using magnetoplasmas for the coherent generation of tunable radiation, early chapters use a mathematical model with one kind of complexity—eliminating the need for high-level mathematics. Using plasma as the basic medium to illustrate various aspects of the transformation of an electromagnetic wave by a complex medium, the text highlights the major effects of each kind of complexity in the medium properties. This significantly expanded edition includes: Three new parts: (a) Numerical Simulation: FDTD Solution, (b) Application: Frequency and Polarization Transformer, and (c) Experiments A slightly enhanced version of the entire first edition, plus 70% new material Reprints of papers previously published by the author—providing researchers with complete access to the subject The text provides the understanding of research techniques useful in electro-optics, plasma science and engineering, microwave engineering, and solid state devices. This complete resource supplies an accessible treatment of the effect of time-varying parameters in conjunction with one or more additional kinds of complexities in the properties of particular mediums.
Author: United States. Air Force. Office of Aerospace Research
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 550
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Book Description
Author: Hans Roland Zapp
Publisher:
ISBN:
Category : Magnetic fields
Languages : en
Pages : 204
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Book Description
Theoretical and experimental investigations were conducted on the propagation of elastic, magnetoelastic, and spin waves in the presence of time-varying and time- and spatially-varying magnetic fields. The propagating media are axially biased rods of yttrium iron garnet (YIG), Ga substituted (GaYIG), Mn substituted YIG (MnYIG), and non-magnetic yttrium aluminum garnet (YAG), all much larger than the propagation wave length so that a uniform plane wave solution description is possible. The theoretical calculations and experimental results verify that a magnetoelastic wave propagating in a time-varying magnetic field experiences a change in frequency (energy) at constant wavenumber (momentum) while the same wave propagating in a spatially-varying magnetic field experiences a change in wavenumber (momentum) at constant frequency (energy). A time- and spatially-varying field yields changes in both frequency and wavenumber and results in frequency and wavenumber sweeping. The use of both time-varying and spatially-varying magnetic fields provides a number of new signal processing effects. (Author).
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 892
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Book Description
Author: Raymond Wolfe
Publisher: Academic Press
ISBN: 1483214710
Category : Technology & Engineering
Languages : en
Pages : 335
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Book Description
Applied Solid State Science: Advances in Materials and Device Research, Volume 2 covers topics about complex oxide materials such as the garnets, which dominate the field of magnetoelasticity and are among the most important laser hosts, and sodalite, which is one of the classic photochromic materials. The book discusses the physics of the interactions of electromagnetic, elastic, and spin waves in single crystal magnetic insulators. The text then describes the mechanism on which inorganic photochromic materials are based, as observed in a variety of materials in single crystal, powder, and glass forms; as well as the chemistry and growth of single crystal materials. Solid state physicists, materials scientists, electrical engineers, and graduate students studying the subjects being discussed will find the book invaluable.
Author: Pavel Kabos
Publisher: Springer Science & Business Media
ISBN: 9401112460
Category : Technology & Engineering
Languages : en
Pages : 315
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Book Description
Magnetostatic Waves and their Applications is the first book devoted to magnetostatic waves. The book gives a thorough review of the field suitable for scientists, engineers and advanced students involved in magnetism and microwave electronics new to this area. It covers the field from essential physics to applications in microwave electronics, with details of the materials and materials processing methods included.
