Handbook of Modern Ferromagnetic Materials (The Springer International Series in Engineering and Computer Science 505)

Below is a copy of Professor Takeshi Takei's original preface that he wrote for my first book, Modem Ferrite Teclmology. I was proud to receive this preface and include it here with pride and affection. We were saddened to learn of his death at 92 on March 12, 1992. Preface It is now some 50 years since ferrites debuted as an important new category of magnetic materials. They were prized for a range of properties that had no equivalents in existing metal magnetic materials, and it was not long before full-fledged research and development efforts were underway. Today, ferrites are employed in a truly wide range of applications, and the efforts of the many men and women working in the field are yielding many highly intriguing results. New, high-performance products are appearing one after another, and it would seem we have only scratched the surface of the hidden possibilities of these fascinating materials. Dr. Alex Goldman is well qualified to talk about the state of the art in ferrites. For many years Dr. Goldman has been heavily involved in the field as director of the research and development division of Spang & Co. and other enterprises. This book, Modem Ferrite Technology, based in part on his own experiences, presents a valuable overview of the field. It is testimony to his commitment and bountiful knowledge about one oftoday's most intriguing areas of technology. The Handbook of Modern Ferromagnetic Materials is an up-to-the-minute compendium of all ferromagnetic materials, metallic and ceramic, intended for electrical and electronic applications. Coverage of the newest and most economically important materials (soft ferrites, the rare-earth magnet alloys, amorphous and nanocrystalline alloys) is extensive. The distinctive feature of this book is its correlation of basic material properties (metallurgical and ceramic) with their magnetic characteristics and eventually to the choice in an application. Unique to this work is information on the many magnetic components into which these materials can be formed and the pertinent design data. Another useful feature is the criteria (quality, stability and economic) for selection of a particular material. Included are the mechanical, thermal and physical properties of these materials. The author not only presents the latest information from suppliers and magnetism conferences but includes a section on new materials (e.g. colossal magnetostriction materials) being developed but not yet available. The format is arranged according to frequency of operation, which turns out to be almost concurrent with the application. Thus, direct current applications are considered first, then low frequency line power, followed by applications at increasing frequencies up to microwave uses. This anthology of ferromagnetic materials is an essential reference work for electrical and electronic designers and materials scientists. It may also serve as a text for a magnetic materials course and as a materials guide for purchasing agents and technical executives Front Matter....Pages i-xix Applications and Functions of Ferromagnetic Materials....Pages 1-15 Basics of Magnetism-Source of Magnetic Effect....Pages 17-40 The Magnetization in Domains and Bulk Materials....Pages 41-58 AC Properties of Magnetic Materials....Pages 59-74 Materials for Permanent Magnet Applications....Pages 75-106 DC and Low Frequency Applications....Pages 107-135 Soft Cobalt-Iron Alloys....Pages 137-144 Metallic Alloys for Magnetic Shielding Applications....Pages 145-154 High-Permeability High-Frequency Metal Strip....Pages 155-182 Metal Powder Cores for Telecommunications Applications....Pages 183-205 Crystal Structure of Ferrites....Pages 207-227 Chemical Aspects of Ferrites....Pages 229-264 Microstructural Aspects of Ferrites....Pages 265-303 Ferrite Processing....Pages 305-360 Ferrite Inductors and Transformers for Low Power Applications....Pages 361-390 Soft Magnetic Materials for EMI Suppression....Pages 391-423 Ferrites for Entertainment Applications-Radio and TV....Pages 425-440 Ferrite Transformers and Inductors at High Power....Pages 441-534 Materials for Magnetic Recording....Pages 535-557 Ferrites for Microwave Applications....Pages 559-570 Miscellaneous Magnetic Material Applications....Pages 571-580 Physical, Mechanical and Thermal Aspects of Ferrites....Pages 581-588 Magnetic Measurements on Materials and Components....Pages 589-621 Back Matter....Pages 623-649