Sa. Makhlouf et al., CHARACTERISTIC HIGH-FIELD DEPENDENCE AND COMPOSITION VARIATION OF GIANT MAGNETORESISTANCE IN FE AG GRANULAR-MATERIALS/, JPN J A P 1, 33(3A), 1994, pp. 1323-1326
Magnetoresistance (MR) measurements of Fe-cluster-dispersed Fe-Ag film
s fabricated by using the ion-cluster-beam technique display the follo
wing features. (1) The giant magnetoresistance (GMR) effect is observe
d in the Fe/Ag granular alloys with 12 to 45 at.% Fe, whereas it is su
ppressed in the Fe-rich region. (2) The MR curves display both saturat
ion- and nonsaturation-type behavior even in a high magnetic field of
140 kOe, whereas the corresponding magnetization curves easily saturat
e at very low fields. The salient point here is that the GMR is optimi
zed without any heat treatment of the specimens, and the results displ
ay some unique features of the GMR in this system.