Magnetic Properties of $ [\hbox{Ni}_{97{\rm at.}\%}$-W$_{3{\rm at.}\%}]_{{100}-{x}}$-Cu$_x$ 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.