The degree of ferromagnetism of ${\rm Ni}\hbox{-}{\rm W}_{\rm y}$ alloys decreases as W-content y increases. Both the saturation magnetization $M_{\rm sat}$ and Curie temperature $T_{\rm c}$ decrease linearly with W-content y, and both ${\rm M}_{\rm sat}$ and $T_{\rm c}$ go to zero at critical concentration of $y_{\rm c}\sim 9.50$ at.% W. To compare with Ni-W alloys, the magnetic properties of a series of both as-rolled (non-textured) and annealed (biaxially textured) ${[{\rm Ni}_{97{\rm at.}\%}{\rm W}_{3{\rm at.}\%}]}_{100-{\rm x}}{\rm Cu}_{\rm x}$ alloy tapes with compositions $x=$ 0, 1, 3, 5, and 7 at.%, were studied. Characterization methods included XRD analyses to investigate the biaxial texturing of the annealed [Ni-W]-Cu alloy tapes and studies of the magnetization $M$ for both as-rolled and annealed [Ni-W]-Cu alloy tapes. Both the isothermal mass magnetizations $M(H)$ of a series of samples at different fixed temperatures and $M(T)$ in fixed field, were measured. The effect of Cu addition on both the saturation magnetization ${\rm M}_{\rm sat}$ and Curie temperature ${\rm T}_{\rm c}$ of the ${\rm Ni}_{97{\rm at.}\%}{\rm W}_{3{\rm at.}\%}$ alloy was investigated.