Abstract
All magnetic materials can be divided into three main classes: diamagnetic, paramagnetic, and magnetically ordered substances. Diamagnetics are pushed out of an external nonuniform magnetic field; they consist of those molecules that do not possess their own magnetic dipole moments. Paramagnetics are drawn into the external nonuniform magnetic field; they consist of molecules possessing inherent magnetic dipole moments in the absence of an internal magnetic field. Ferromagnetics and ferrimagnetics are among the magnetically ordered substances and are highly reacting on an external magnetic field. There is also a class of antiferromagnetic substances, weakly reacting on an external field. This chapter describes the nature of all these substances and considers the characteristics that describe macro- and microproperties of magnetics. There are three sources of the magnetic properties of substances: electron spin, orbital electron motion, and change of the electron orbital angular momentum at the imposition of an external magnetic field. The first two can explain paramagnetism and the third can be used in considering diamagnetism.
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