GIANT MAGNETORESISTANCE AND CO-CLUSTER STRUCTURE IN PHASE-SEPARATED CO-CU GRANULAR ALLOYS

We examine the effect of Co-cluster morphology on giant magnetoresistance (MR) in phase-separated Co-Cu films. The Co clusters were characterized through grazing incidence, anomalous, small-angle x-ray scattering. With thermal annealing the Co cluster diameter increases from 21 to approximately 250 angstrom with a concomitant drop from approximately 35% to 1% in the 4.2 K MR. The MR scales approximately as the inverse cluster size. Comparison with theory indicates that interfacial spin-dependent electron scattering is the dominant scattering mechanism underlying giant MR for cluster diameters up to at least 250 angstrom.