Effect of magnetic field annealing on magnetic properties for nanocrystalline (Fe1-xCox)78.4Si9B9Nb2.6Cu1 alloys

The crystalline volume fraction V-cry, saturation magnetostriction lambda(s), effective magnetic anisotropy < K >, and temperature dependence of initial permeability (mu(i)-T curves) for magnetic and nonmagnetic annealed (Fe1-xCox)(78.4)Si9B9Nb2.6Cu1 (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 lambda(s). The Co content has an obvious effect on the lambda(s) 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 lambda(s) and larger V-cry were observed. (C) 2013 American Institute of Physics.