Influence of Magnetic Field Annealing on Magnetic Properties for Nanocrystalline $({\rm Fe}_{0.5}{\rm Co}_{0.5})_{73.5}{\rm Cu}_{1}{\rm Mo}_{3}{\rm Si}_{13.5}{\rm B}_{9}$

Influence of magnetic field annealing on room- and high-temperature magnetic properties of nanocrystalline (Fe_0.5Co_0.5)_73.5Cu₁Mo₃Si_13.5B₉ alloy was investigated. The initial permeability (μ_i) of nonmagnetic annealed samples decreases with annealing temperature (T_a) increasing, while the μ_i of magnetic annealed samples increases with T_a. In contrast to the nonmagnetic annealing samples, the saturation magnetostriction (λ_S) of magnetic annealed samples decreases with Ta increasing because of the ordered rearrangement of the magnetic domain along the applied field direction. Meanwhile, magnetic annealing can induce a uniaxial anisotropy, which results in the enhancement of effective magnetic anisotropy (<;K>). The change of λ_S and can be used to interpret the temperature dependence of initial permeability (μ_i-T curves) for nanocrystalline alloys.