Abstract
The origin of magneto elasticity is the interplay of the elastic properties of a material and its magnetic state. The magneto elastic coupling terms in the free energy give rise to (extra) strains in a magnetic substance, i.e. the volume magnetostriction and the Joule magnetostriction (anisotropic changes in linear dimensions). Nanoscale thin films and multilayers, nanocrystalline magnetic materials, granular films, and amorphous materials have been and still are most attractive topics in the field of basic and applied magnetic research. The local properties of these nanoscale heterogeneous magnetic systems do vary in the scale of nanometers, for amorphous materials down to an atomic scale. One is able to produce nanocrystals with a narrow size distribution, embedded in an amorphous matrix at approximately constant distance between them. Granular solids composed of magnetic particles diluted in a non-magnetic matrix are also heterogeneous systems.
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