Univ Santiago Chile Dept Fis Csilla 307 Santiago 2 Chile
Max Planck Inst Festkorperforsch D-70569 Stuttgart Germany
Univ Fed Fluminense Inst Fis Br-24210340 Niteroi Rj Brazil

The magnetic and transport properties of ferromagnetic clusters embedded in a metallic host are studied. A simple model is presented to explain the observed behaviour of the magnetoresistance in such systems. The role played by both the dipolar interaction between the clusters and the ratio of the electronic mean free path in the non-magnetic material to the average inter-cluster distance is clarified. Finally, a suggestion is made of systems in which the best magnetoresistance ratios are expected to be found.
 

Journal of Physics: Condensed Matter, 9 9931-9938, 1997.