Ferromagnetic Domain Theory

Publisher Summary The chapter presents a study on ferromagnetic domain theory. The chapter presents a broad review of the physical principles of domain theory and of the crucial experiments which bear directly on the foundations of the subject of ferromagnetic domains. The chapter is organized in two stages. There is first an introductory survey, which describes the basic physical concepts of domain theory in general nonmathematical terms. The ideas are then developed in detail. The essential aspects of ferromagnetism are illustrated by the implications of the following experimental fact: It is possible to change the overall magnetization of a suitably prepared ferromagnetic specimen from a n initial value of zero (in the absence of an applied magnetic field) to a saturation value of the order of 1000 gauss, by the application of a field whose strength may be of the order of 0.01 oersted. This fact contains two significant observations: (1) it is possible in some cases to attain saturation magnetization by the application of a very weak magnetic field. (2) It is possible for the magnetization of the same specimen to be zero in zero (or nearly zero) applied field. The chapter discusses that domain structure is a natural consequence of the various contributions to the energy-exchange, anisotropy, and magnetic-of a ferromagnetic body. The chapter presents a discussion on coercive force, hysteresis, and reversible permeability, including reversible permeability and Barkhausen effect.

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