We have studied the influence of RF deposition power on magnetization and g
iant magnetoresistance (GMR) in sputtered Co26Cu74 granular films, in order
to increase GMR of as-deposited samples. M(H) measurements are fitted with
superparamagnetic and ferromagnetic components and the cluster size inferr
ed. Room temperature magnetoresistance as high as 8% (minimum cluster radiu
s similar to 1.9 nm) was achieved with maximum RF power. (C) 1999 Elsevier
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