Magnetisation and AC susceptibility measurements have been performed to cha
racterize the melt-spun Cu97.5Co2.5 alloy. The magnetisation curve, at room
temperature, shows two contributions, one superparamagnetic and the other
nearly paramagnetic. The temperature dependence of the in-phase AC suscepti
bility shows two maxima with different dynamical character. These two anoma
lies are ascribed to be superparamagnetic blocking and spin-glass freezing
and agree with previous magnetic and structural studies of the same alloy s
ystem. (C) 1999 Elsevier Science B.V. All rights reserved.