Effect of magnetic field annealing on magnetic properties for nanocrystalline (Fe_(1-x)Co_x)_(78.4)Si_9B_9Nb_(2.6)Cu_1 alloys

摘要

The crystalline volume fraction V_(cry), saturation magnetostriction λ_s, effective magnetic anisotropy , and temperature dependence of initial permeability (μ_i-T curves) for magnetic and nonmagnetic annealed (Fe_(1-x)Co_x)_(78.4)Si_9B_9Nb_(2.6)Cu_1 (x = 0.35, 0.5, 0.65, 1) alloys were investigated. The results showed that the magnetic annealing can enhance the V_(cry) and significantly reduce the λ_s. The Co content has an obvious effect on the λ_s and , the largest 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 λ_s and larger V_(cry) were observed.