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By J. M. D. Coey

This ebook is an crucial textual content at the interesting technology of magnetism, and a useful resource of sensible reference information. available, authoritative, and assuming undergraduate familiarity with quantum mechanics, electromagnetism and vectors, this textbook can be utilized on graduate classes. Emphasis is put on functional calculations and numerical magnitudes - from nanoscale to astronomical scale - with a spotlight on smooth manifestations, together with spin digital units. every one self-contained bankruptcy starts off with a precis, and ends with routines and additional interpreting. The e-book is carefully illustrated with over six hundred figures to assist exhibit strategies and obviously clarify principles. simply digestible tables and knowledge sheets supply a wealth of worthy info on magnetic fabrics, and 38 imperative magnetic fabrics, and plenty of extra comparable compounds, are handled intimately.

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It is instructive to contrast attitudes of academic and industrial scientists to new knowledge and technology. One seeks diffusion, the other ownership. Academic research is rewarded by peer recognition, industrial development by profit. Both share an understanding that by interrogating nature in a structured and rational way, trustworthy and objective knowledge of practical importance can be obtained. This is what unites the geomancer, the telegraph engineer, the PhD student struggling for data, the corporate scientist whose invention could trigger a billion dollar investment providing employment for thousands and the professor attempting to draw the strands together in a book on this felicitous science.

24) The previous discussion of fields created by currents and magnetic moments, and Maxwell’s equations themselves could as easily have been cast in terms of H in place of B, provided we remain in free space. 13) become equations for H if we drop µ0 . 16), which leads to Amp`ere’s law. 25) where j c is the conduction current in electrical circuits and j m is the Amp`erian magnetization current associated with the magnetized medium. The difficulty is that j c can be measured, but j m cannot. We have no experimental method, direct or indirect, of precisely determining the currents circulating within a solid that create its magnetization.

This approach yields the B-field both inside and outside the solid medium. 52) where en is the outward normal at a point on the surface. 5) and adding the effects of the bulk and surface contributions to the current density, (M × en ) × (r − r ) 2 d r . 53) The first integral is zero for a uniform distribution of M, because ∇ × M is then zero, and the calculation reduces to evaluating the integral of the surface current density. ∇ indicates differentiation with respect to r . 4 Magnetic field calculations The third approach uses the equivalent distributions of magnetic charge in the bulk and at the surface of the magnetized material: ρ m = −∇ · M and σ m = M · en .

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