### 5. Conclusion

[47] The model of interacting single-domain particles underlying the analysis of
relations between various types of magnetization is, in a certain aspect,
similar to the model of an ideal gas in which every atom is represented, in a
first approximation, by a particle that is only capable of energy and momentum
exchange with other particles. It is remarkable that, even in terms of this
simple model, one can obtain the Mendeleev-Clapeyron equation, having a rather
wide application area. A simple technique incorporating a finite volume of atoms
and their possible interaction yields the Van der Waals equation predicting
vapor-liquid transitions. Of course, a more realistic description of an atom as
a complex quantum-mechanical system appears to be preferable, but numerical
problems involved in this approach are evident; it is also evident that some
reasonable restrictions are inevitable in incorporating properties of the atom,
which is a main constituent of the kinetic theory of gases. A similar situation
is observed in the case of the system of interacting single-domain particles
whose properties are fairly complex, as is evident from the results of this
paper. Therefore, it is natural to accept, as a first approximation, the
simplest model of a single-domain particle and introduce additional restraints
only if model results diverge significantly with experimental data. In our
opinion, the results that we obtained from this detailed study of properties of
single-domain particles can be useful for gaining insights into such well-known
phenomena as the stabilization of the magnetic moment with time, the
metastability of magnetic states in rocks, the pressure-induced destruction of
remanent magnetization, and so on; these phenomena cannot be interpreted in
terms of the simplest assumptions on the properties of
*I*_{r}, *H*_{0} and the
interaction field
*H*.

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