Abstract
A detailed study of the dc hysteresis loops for current and furnace annealed amorphous wires with vanishing saturation magnetostriction constant, λs, is reported. Measurements were conducted on wires of nominal compositions (Co0.94Fe0.06)72.5Si12.5B15 and (Co0.93Fe0.07)72.5Si12.5B15 which had λs values of similar magnitude but opposite sign. The results revealed the establishment and evolution of Barkhausen jumps at different points on the major hysteresis loops. These are interpreted on the basis of the core-shell domain model, widely used in the study of amorphous magnetic wires. The control of these jumps is essential for applications of wires where magnetic noise may be an issue. The influence of annealing conditions on the coercivity and susceptibility of the wires is also reported.
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