LARGE ENHANCEMENT OF THE PERPENDICULAR GIANT MAGNETORESISTANCE IN PSEUDORANDOM MAGNETIC MULTILAYERS

It is predicted that the current-perpendicular-to-plane giant magnetor esistance (CPP GMR) in magnetic multilayers with dimensions smaller th an the electron mean free path is greatly enhanced by growing layers w ith thicknesses that follow a pseudorandom number sequence. The CPP GM R, calculated from the Kubo formula, is shown to increase exponentiall y with the multilayer thickness. This is due to Anderson localization, which is strong in zero field, but becomes weak in one of the spin ch annels when the layer moments are aligned in a saturating magnetic fie ld.