Abstract
The crystalline volume fraction Vcry, saturation magnetostriction λs, effective magnetic anisotropy 〈K〉, and temperature dependence of initial permeability (μi-T curves) for magnetic and nonmagnetic annealed (Fe1−xCox)78.4Si9B9Nb2.6Cu1 (x = 0.35, 0.5, 0.65, 1) alloys were investigated. The results showed that the magnetic annealing can enhance the Vcry and significantly reduce the λs. The Co content has an obvious effect on the λs and 〈K〉, the largest 〈K〉 was observed for the x = 0.5 magnetic annealed sample, which can be explained with magnetic atoms pair ordering theory. And the best high-temperature magnetic softness was obtained for x = 0.35 magnetic annealed sample, in which the lower λs and larger Vcry were observed.
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