OSCILLATORY EXCHANGE AND GIANT MAGNETORESISTANCE IN CO-CU SUPERLATTICES DEPOSITED ON GLASS SUBSTRATES

We report a study Of (Co11angstromCutCu)xn superlattices sputtered ont o glass substrates with an intervening 50 angstrom Fe buffer layer. Os cillatory exchange coupling and enhanced magnetoresistance were observ ed. The MR reaches 45% at room temperature for n = 30, and for t(Cu) = 10.4 angstrom. From the saturation field we obtain J(AF) = - 0.18 erg /cm2. A single Co11angstrom/Cu10angstrom/Co11angstrom struture shows a MR of 8% at room temperature with H(s) = 800 Oe. The MR results were analyzed by solving the Boltzmann equation for the multilayer structur e assuming both interface and bulk spin-dependent scattering. Perfect antiferromagnetic coupling with zero remanence was found for t(Cu) = 1 1 angstrom while a square hysteresis loop is observed for t(Cu) = 22 a ngstrom.