Concise Encyclopedia of Magnetic and Superconducting - download pdf or read online

By K.H.J. Buschow Ph.D.

ISBN-10: 0080445861

ISBN-13: 9780080445861

ISBN-10: 0080457657

ISBN-13: 9780080457659

Magnetic and superconducting fabrics pervade each road of the technological global - from microelectronics and mass-data garage to drugs and heavy engineering. either components have skilled a up to date revitalisation of curiosity a result of discovery of recent fabrics, and the second look of quite a lot of easy mechanisms and phenomena. This Concise Encyclopedia attracts its fabric from the award-winning Encyclopedia of fabrics and Engineering , and comprises updates and revisions now not to be had within the unique set -- making it definitely the right reference significant other for fabrics scientists and engineers with an curiosity in magnetic and superconducting fabrics. * includes in way over a hundred thirty articles, taken from the award-winning Encyclopedia of fabrics: technology and know-how , together with ScienceDirect updates no longer on hand within the unique set. * each one article discusses one point of magnetic and superconducting fabrics and comprises photos, line drawings and tables to help the knowledge of the subject handy. * Cross-referencing publications readers to articles protecting topics of similar curiosity.

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Extra info for Concise Encyclopedia of Magnetic and Superconducting Materials

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For this reason only this type will be discussed below. A more detailed description of both types of hard ferrites can be found in the review by Buschow (1997). ) Alnico magnets are composed of iron, cobalt, nickel, aluminum, and various types of additives. These are magnets of metallic character obtained by casting. One of the advantages of alnico alloys is that the melting can be performed in air, although sometimes an apron of inert gas is blown over the melt. Alnico alloys can also be prepared by sintering powders of the raw materials, aluminum being always added in the form of a prealloy with one or more of the other constituent metals.

Moreover, the mechanisms responsible for anisotropy formation also control the thermal aging of the material. Hence, good thermal stability of the magnetic properties requires a possibly high activation energy and slow kinetics of anisotropy formation. Finally, both amorphous and nanocrystalline alloys generally reveal low losses and a high permeability even at elevated frequencies up to several hundred kilohertz. The favorable high-frequency behavior, comparable to or even better than in Mn–Zn ferrites (see Ferrites), is essentially related (i) to the thin ribbon gauge of dE20 mm inherent to the production technique, and (ii) to a relatively high electrical resistivity of typically rE100–130 mO cm, which both reduce eddy current losses.

Instead magnetization reversal can occur by a complex incoherent mechanism known as ‘‘curling’’ (McCurrie 1982). It can proceed in lower fields, which accounts for the lower observed coercivities. The various grades of alnico-type alloys are usually referred to by plain numbers, as indicated in the first column of Table 1. More details of the preparation and second quadrant characteristics of these and other alnico-type permanent magnet materials can be found in the review of McCaig and Clegg (1987).

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Concise Encyclopedia of Magnetic and Superconducting Materials by K.H.J. Buschow Ph.D.


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