Özet:
The dependence of the magnetisation loops, coercivity, anisotropy constant and ΔE effect (the change of Young’s modulus as a function of the magnetic field) was studied in negatively magnetostrictive Co 72.5Si 12.5B15 cold-drawn amorphous wires, with a mean diameter of 100 µm, under annealing conditions. Samples were annealed at a temperature of 460 ∘C for time periods between 0.3 and 1300 min. The results indicated that progressive annealing initially led to relief of the internal stresses and that annealing of the wire at 460 ∘C for 90 min produced the minimum coercivity, which was ∼ 0.0063 Oe. Further annealing increased the coercivity and anisotropy due to partial crystallisation at the surface. The maximum change in Young’s modulus was ∼27 % and was seen in the wire that was annealed for 60 min. © 2014, Springer Science+Business Media New York.