AN ACOUSTIC ANALOG OF THE GIANT MAGNETORE SISTANCE EFFECT IN METALLICMULTILAYER FILMS

It is shown that the mechanisms of the giant magnetoresistance effect observed in metal magnetic multilayer films manifest themselves in the absorption of long-wove ultrasound penetrating the film. The electron absorption of ultrasound in thin layers is found to be mainly due to electron scattering by boundaries. The character of correlation of the magnetic field dependences of absorption coefficient and magnetoresis tance is defined by that mechanism of the effect which is realized in a given film.