Large enhancement of the perpendicular giant magnetoresistance in pseudorandom magnetic multilayers

It is predicted that the current-perpendicular-to-plane giant magnetoresistance (CPP GMR) in magnetic multilayers with dimensions smaller than the electron mean free path is greatly enhanced by growing layers with thicknesses that follow a pseudorandom number sequence. The CPP GMR, calculated from the Kubo formula, is shown to increase exponentially with the multilayer thickness. This is due to Anderson localization, which is strong in zero field, but becomes weak in one of the spin channels when the layer moments are aligned in a saturating magnetic field.