Low‐temperature specific heat and magnetization measurements with Ni&sngbnd;Cu solid solutions indicate the presence of magnetic clusters in these alloys between 47% and 62% Cu. Up to 57% Cu the interaction between clusters is sufficient for the alloys to become ferromagnetic at low temperatures.1The paramagnetic susceptibility of the alloys with higher Cu content is essentially independent of temperature above 200°K; in this temperature range the susceptibility depends on the Cu content. At low temperatures the susceptibility becomes temperature dependent and its value is strongly influenced by impurities, e.g., Fe and Co. The decrease of the ferromagnetic moment with increasing Cu content is not a result of the filling of thedband. Rather, it can be accounted for on the basis of the dependence of the moment associated with Ni atoms on their local atomic environment.2