Physical processes in magnet-containing media determine the regularities of evolution of states, properties and phenomena. The development of the more sensitive methods of investigations led to the specialization of studies in the narrower areas, as a result the possibility to observe and to generalize laws of physical processes was lost. The analysis of results about well studied galvanomagnetic phenomena into magnetodielectrics, semiconductors and metals makes it possible to reveal the generality of the effects of temperature, magnetic field and pressure (T, H, P). 

In the present work we consider the mechanism of elastic strains and stresses as the main controlling factor of structure change under the influence of temperature, magnetic field, hydrostatic pressure. We should take into account that the energy of elastic deformation is commensurate to the energy of electric interactions and that is much higher than the rest of the bonds of lower energy value. Besides, the energy elastic stresses are of long range, so it forms the linearity in magnetization and bulk change. These regularities requires a fundamental understanding of the laws of interaction with respect to accepted interpretation of quantum mechanical forces of short range that are attributes of magnetism formation. 

The role of elastic stresses in the linear changes of the magnetostriction, magnetization, magnetoelasticity of single-crystal magnetic semiconductors is described. We suggest also the explanation of the colossal magnetoresistance as a consequence of the elasticity laws. Here we state the results of the causal action of the elastic stresses that control the evolution of the structure and the properties and form the phase transformations in magnetic dielectrics and metals.

P.I. Polyakov, T.A. Ryumshyna. Magnetism and Laws of Bulk Elasticity, Transworld Research Network, 2009.

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