Magnetic Properties of [Ni97at.%-W3at.%]100−x-Cux Textured Substrates for Coated Conductors

The degree of ferromagnetism of Ni-W_y alloys decreases as W-content y increases. Both the saturation magnetization M _sat and Curie temperature T _c decrease linearly with W-content y, and both M _sat and T _c go to zero at critical concentration of y_c ~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) [Ni_97at.%-W_3at.%]_100-x-Cu_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 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 and Curie temperature T_c of the Ni_97at.%-W_3at.% alloy was investigated.