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Theory of ferrites -- Their science and technology -- Properties of matter in the solid state -- Dielectric properties of ferrites -- Magnetic properties of ferrites -- The permeability tensor -- Eddy current, hysterisis, and residual losses in ferrites -- Measurements of ferrite properties -- Propagation of electromagnetic waves in infinite anisotropic media -- Propagation of electromagnetic waves through anisotropic waveguides -- Application of ferrites below microwave frequencies -- Longitudinal field devices -- Transversely magnetized ferrite devices -- Dielectric loading and tapered field devices -- Field displacement devices -- Cutoff phenomena in magnetized ferrites -- Nonlinear ferrite devices -- System application of ferrite devices -- Mathematical formulae -- Derivation of the perturbation relations -- Transcendental equation involving the propagation constant -- Discussion of gaussian and mks practical units -- Some design problems of microwave ferrite devices.
This book presents an overview of the status and recent trends in ferrites. It provides readers with a clear understanding of both the theory and applications of ferrites. It also discusses challenges, opportunities, and new directions for the future development of ferrite technology. The book provides fundamental knowledge and up-to-date information to enable advanced study in the field and is therefore a useful resource for research students, scientists, engineers, and materials scientists.
The Use of Ferrites at Microwave Frequencies describes the applications of ferrites at microwave frequencies and the apparatus involved. Topics covered range from the properties of ferrites to gyromagnetic and non-reciprocal effects, ferrite isolators, circulators, and modulators. The use of ferrites in variable frequency filter cavities is also discussed. Mathematical explanations are reduced to the strict minimum and only the results of calculations are indicated. This book consists of seven chapters and opens with a review of the theory of magnetism, touching on subjects such as the BOHR magneton, diamagnetism and paramagnetism, ferromagnetism and antiferromagnetism, ferrimagnetism, and demagnetizing. The next chapter deals with the elementary theory of gyromagnetic effects and covers the kinetic moment theorem, precession of the spin moment, gyromagnetic resonance, complex permeability, and gyromagnetic effects in the atom. The reader is then introduced to ferrites and their properties; non-reciprocal effects and their applications; and ferrite isolators, circulators, and modulators. The final chapter describes the use of ferrites in the design of cavities whose resonant frequency is controlled by a magnetic field or filters with variable characteristics. This monograph is written primarily for microwave and electronics engineers.
Revision of a classic reference on ferrite technology Includes fundamentals as well as applications Covers new areas such as nanoferrites, new high frequency power supply materials, magnetoresistive ferrites for magnetic recording
Includes a full mathematical treatment of the interaction of an electromagnetic wave with a gyromagnetic ferrite material.
Die jüngsten Fortschritte im Bereich der drahtlosen Telekommunikation und dem Internet der Dinge sorgen bei drahtlosen Systemen, beim Satellitenfernsehen und bei intelligenten Transportsystemen der 5. Generation für eine höhere Nachfrage nach dielektrischen Materialien und modernen Fertigungstechniken. Diese Materialien bieten ausgezeichnete elektrische, dielektrische und thermische Eigenschaften und verfügen über enormes Potenzial, vor allem bei der drahtlosen Kommunikation, bei flexibler Elektronik und gedruckter Elektronik. Microwave Materials and Applications erläutert die herkömmlichen Methoden zur Messung der dielektrischen Eigenschaften im Mikrowellenbereich, die verschiedenen Ansätze zur Lösung von Problemen der Materialchemie und von Kristallstrukturen, in den Bereichen Doping, Substitution und Aufbau von Verbundwerkstoffen. Besonderer Schwerpunkt liegt auf Verarbeitungstechniken, Einflüssen der Morphologie und der Anwendung von Materialien in der Mikrowellentechnik. Gleichzeitig werden viele der jüngsten Forschungserkenntnisse bei Mikrowellen-Dielektrika und -Anwendungen zusammengefasst. Die verschiedenen Kapitel untersuchen: Oxidkeramiken für dielektrische Resonatoren und Substrate, HTCC-, LTCC- und ULTCC-Bänder für Substrate, Polymer-Keramik-Verbundstoffe für Leiterplatten, Elastomer-Keramik-Verbundstoffe für flexible Elektronik, dielektrische Tinten, Materialien für die EMV-Abschirmung, Mikrowellen-Ferrite. Ein umfassender Anhang präsentiert die grundlegenden Eigenschaften von mehr als 4000 verlustarmen dielektrischen Keramiken, deren Zusammensetzung, kristalline Struktur und dielektrischen Eigenschaften für Mikrowellenanwendungen. Microwave Materials and Applications wirft einen Blick auf sämtliche Aspekte von Mikrowellenmaterialien und -anwendungen, ein nützliches Handbuch für Wissenschaftler, Unternehmen, Ingenieure und Studenten, die sich mit heutigen und neuen Anwendungen in den Bereichen drahtlose Kommunikation und Unterhaltungselektronik beschäftigen.
Chapter 1 is dedicated to the consideration of properties of ferrites at superhigh frequencies. In the following two chapters there are investigated basic 'magneto-optical' phenomena in ferrites. At first, there is considered the case of an infinite ferrite medium (Chapter 2), and then the case of waveguides and resonators weakly filled with magnetized ferrites (Chapter 3). These two simple cases, although somewhat idealized, make it possible, without special mathematical efforts, to clarify the basic features of 'magnetooptical' phenomena in magnetized ferrites and to understand the role played in these phenomena by the waveguide. Chapter 4 is devoted to the strict theory of waveguides containing magnetized ferrites. Thus, in the first four chapters there are expounded questions of the general theory of phenomena occurring in waveguides with magnetized ferrites. Following five chapters (5-9) are dedicated to the detailed investigation of the most important phenomena which have great practical applications. Finally, in Chapter 10 there are described different ferrite devices created on the bases of the above-indicated phenomena and obtaining wide application in SHF technology. This chapter ends with the consideration of the problems of theory and design of linear ferrite SHF devices.
Due to their unique electrical and magnetic characteristics, ferrites are useful for a wide range of technological applications including refrigerators, air conditioners, microwave ovens, radio and telecommunication devices, and computers. This book presents knowledge about ferrites, their fabrication, characterizations, and applications in different areas. It is a useful resource for students, scientists, and engineers working in the field of ferrites.
MODERN FERRITES, Volume 1 A robust exploration of the basic principles of ferrimagnetics and their applications In Modern Ferrites Volume 1: Basic Principles, Processing and Properties, renowned researcher and educator Vincent G. Harris delivers a comprehensive overview of the basic principles and ferrimagnetic phenomena of modern ferrite materials. Volume 1 explores the fundamental properties of ferrite systems, including their structure, chemistry, and magnetism; the latest in processing methodologies; and the unique properties that result. The authors explore the processing, structure, and property relationships in ferrites as nanoparticles, thin and thick films, compacts, and crystals and how these relationships are key to realizing practical device applications laying the foundation for next generation technologies. This volume also includes: Comprehensive investigation of the historical and scientific significance of ferrites upon ancient and modern societies; Neel’s expanded theory of molecular field magnetism applied to ferrimagnetic oxides together with theoretic advances in density functional theory; Nonlinear excitations in ferrite systems and their potential for device technologies; Practical discussions of nanoparticle, thin, and thick film growth techniques; Ferrite-based electronic band-gap heterostructures and metamaterials. Perfect for RF engineers and magnetitians working in the field of RF electronics, radar, communications, and spintronics as well as other emerging technologies. Modern Ferrites will earn a place on the bookshelves of engineers and scientists interested in the ever-expanding technologies reliant upon ferrite materials and new processing methodologies. Modern Ferrites Volume 2: Emerging Technologies and Applications is also available (ISBN: 9781394156139).