HIGH-FREQUENCY IMPEDANCE OF MAGNETIC SUPERLATTICES SHOWING GIANT MAGNETORESISTANCE

A semiclassical theory of high frequency electron transport in magneti c superlattices showing giant magnetoresistance is developed with temp oral and spatial dispersion taken into account. Starting from the usua l kinetic equations for spin-dependent distribution functions with app ropriate boundary conditions, we derive a system of diffusion-like equ ations for distribution functions averaged over the period of the supe rlattice. Non-local conductivity, surface impedance, and the magnetoab sorption of the superlattice are calculated and analyzed within the pr oposed model.