Effect of magnetic field annealing methods on soft magnetic properties for nanocrystalline (Fe_0.5Co_0.5)_73.5Si_13.5B₉Nb₃Cu₁ alloy

The effect of magnetic field annealing methods on soft magnetic properties for nanocrystalline (Fe_0.5Co_0.5)_73.5Si_13.5B₉Nb₃Cu₁ alloy was investigated. In contrast to nonmagnetic field annealing, the magnetic field annealing can obviously reduce saturation magnetostriction λ_s and increase effective magnetic anisotropy 〈K〉. Furthermore, the initial permeability μ_i of experimental samples can be enhanced significantly after magnetic field annealing. Different magnetic field annealing methods produced varying degrees of impact on the μ_i of samples, which is ascribed to the difference of obtained λ_s and 〈K〉. In three magnetic field annealing methods, the magnetic field nanocrystallization can manifest more effective magnetic field effect compared with other two magnetic field annealing methods and achieve more superior magnetic softness, the reason of which was also analyzed.