. (Compare with electrostriction) This effect can cause losses due to frictional heating in susceptible ferromagnetic cores. Explanation Internally, ferromagnetic materials have a structure that's divided into domains, each of which is a region of uniform magnetic polarization. When a magnetic field is applied, the boundaries between the domains shift and the domains rotate, both of these effects cause a change in the material's dimensions. The reciprocal effect, the change of the susceptibi… (More on Magnetostriction)