Chapter VII magnetic materials

In this Chapter we have attempted to cover the literature dealing with magnetic materials. We use the work “magnetism” in the narrow sense of the spontaneous alignment of electron spins by interatomic forces. This definition includes the phenomena of ferromagnetism, ferrimagnetism, antiferromagnetism, “tweak” ferromagnetism, piezomagnetism, and other forms of magnetism for which special terms are not in general use. We have included also literature dealing with structure, preparation and nonmagnetic physical properties when these seemed closely related to magnetism. Among subjects not covered are paramagnets with low magnetic transition temperatures, geomagnetism and rock-magnetism.