GMR in co-evaporated Co-Ag granular thin films

We report the magnetic and magnetoresistive behavior of CoxAg100-x granular films over a wide range of compositions (x = 20-80 at%), deposited by obli que co-evaporation at room temperature. The average size of magnetic partic les estimated from the magnetization data, assuming a log-normal distributi on function, varies with x from 20 to about 50 Angstrom. The GMR variation with x shows a broad maximum at x(max) = 34 at% at T = 300 K, which increas es similar to 3 times at 10 K while x(max) shifts to 25 at%. (C) 1999 Elsev ier Science B.V. All rights reserved.