Magnetoresistance in as-deposited CoCu granular films

CoCu granular films were prepared by the de magnetron facing-target sputter ing. Magnetoresistance (MR) was measured in the magnetic fields applied in film plane, parallel and perpendicular to the electrical current. Both the anisotropic magnetoresistance (AMR) and the giant magnetoresistance (GMR) w ere observed. The most interesting observation is that with the temperature decreasing the AMR increases, but the GMR decreases. The temperature depen dence of the MR may be understood by taking into account of the magnetic in teractions among Co granules. (C) 2001 Elsevier Science B.V. All rights res erved.