Modeling field dependence of giant magnetoresistance in ‘‘granular’’ and quasi-granular magnetic films

Giant magnetoresistance in granular alloy thin films prepared by co-sputtering as well as in quasi-granular disordered multilayers has been modeled with relative ease using a simple scattering concept appropriate to superparamagnetic films and involving the Langevin function. The model has been applied to both as-deposited and annealed samples with the result that approximate sizes of spin clusters may be determined.