Abstract
Magnetic properties and giant magnetoresistance (GMR) of granular CoCu layers produced by ion-beam mixing were investigated. Laser-deposited CoCu multilayers with an integral composition of Co 20Cu 80 were ion-beam mixed with 150 keV Cu +. At a maximum fluence of 5×10 15 Cu/cm 2 the multilayer structure is completely replaced by a granular microstructure. Thermal magnetization curves indicate a broad distribution of Co-cluster sizes with superparamagnetic contributions. The magnetoresistance increases strongly by ion-beam mixing. There is evidence for strong magnetic interaction effects related with irradiation damages. The interaction effects can be reduced by annealing, which further increases the magnetoresistance.
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