ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
This paper presents results on the magnetic properties of NiCu and NiCo alloys with compositions in the range 70%–100% Ni. Measurements include coercivity initial susceptibility, maximum differential susceptibility, magnetostriction, and Barkhausen effect emissions. Results revealed a surprising increase in the magnetostriction as a function of magnetic induction B as the copper content increased. The saturation magnetostriction λs was nevertheless found to decrease with copper content. The addition of cobalt reduced the magnitude of the magnetostriction resulting in a change of sign from negative to positive at between 20% and 30% cobalt. Coercivity was found to be little affected by elastic stress, but strongly affected by plastic deformation such as occurs, for example, in cold working. A similar result was true for initial susceptibility. Maximum differential susceptibility was, however, found to be strongly dependent on elastic stress. Results were interpreted in terms of stress induced uniaxial anisotropy. As the tensile stress increased the magnetization became more reversible, but the susceptibility decreased.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.341399
