Abstract
Fe cluster dispersed Fe X Cu 100- X granular films have been produced by a cluster beam (CB) technique. X-ray diffraction and XAFS measurements indicate that the structure of Fe clusters is b.c.c. for x >60, f.c.c. for x <20 and b.c.c.+f.c.c. for 20< x <60. Magnetoresistance (MR) does not saturate even at an external field of 140 kOe, probably because Fe clusters are very small and magnetic moments of Fe atoms at the cluster surface display a spin glass and/or superparamagnetic character. The MR value monotonically increases with decreasing Fe concentration, showing no maximum. Based upon the Mossbauer spectra, spontaneous magnetic moments and structural studies, such anomalous concentration dependence of MR is attributed to the characteristic magnetism of the present Fe X Cu 100- X granular films: Fe clusters are spin glass in the dilute Fe-f.c.c., antiferromagnetic in the Cu-rich f.c.c. and ferromagnetic in the Fe-rich b.c.c. region.
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