Download Introduction to Magnetism and Magnetic Materials by David Jiles PDF

By David Jiles

1 Magnetic Fields.- 2 Magnetization and Magnetic Moment.- three Magnetic Measurements.- four Magnetic Materials.- five Magnetic Properties.- 6 Magnetic Domains.- 7 area Walls.- eight area Processes.- nine Magnetic Order and significant Phenomena.- 10 digital Magnetic Moments.- eleven Quantum conception of Magnetism.- 12 smooth Magnetic Materials.- thirteen challenging Magnetic Materials.- 14 Magnetic Recording.- 15 Superconductivity.- sixteen Magnetic equipment for fabrics Evaluation.- suggestions.

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A second group of materials for which X is small and positive and typically X ~ 10- 3 to 10- 5 are the paramagnets. The magnetization of paramagnets is weak but aligned parallel with the direction of the magnetic field. Examples of paramagnets are aluminum, platinum and manganese. The most widely recognized magnetic materials are the ferromagnetic solids for which the susceptibility is positive, much greater than 1, and typically can have values X ~ 50 to 10000. Examples of these materials are iron, cobalt and nickel and several rare earth metals and their alloys.

The origin of the net angular momentum of the electrons requires further development of ideas before it can be explained. Discussion is therefore deferred until Chapters 9, 10 and 11. Magnetic moment and magnetization 31 A related quantity, the magnetic polarization or intensity of magnetization I is used in the Kennelly convention. 1oM . Although it is not often employed when the Sommerfeld system is used, it is a useful unit. Measuring the magnetic polarization I of a material in tesla is often more convenient than measuring the magnetization Min A/m.

Further reading 25 The advantages of numerical techniques such as the finite- element method over analytical methods of field computation were demonstrated in the case of leakage fields by Hwang and Lord [15]. This was the first successful attempt to use numerical field calculations for the determination of fields in the vicinity of defects in materials. The implementation of both finite-difference and finite-element methods to two-dimensional nonlinear magnetic problems have been compared by Demerdash and Nehl [16].

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