研究了(Fe1-xCox)78.4Nb2.6Si9B9Cu1（x=0.35、0.5、0.65）合金在真空条件下（1×10-3Pa）490℃等温退火30min后的结构与高频磁性。XRD分析表明，非晶 (Fe1-xCox)78.4Nb2.6Si9B9Cu1合金490℃退火后析出晶粒尺寸约15nm的α-FeCo(Si)软磁晶体相，随Co含量的增加，α-FeCo(Si)晶格常数变小，晶粒尺寸略有增大。利用Pseudo-Voigt2函数模拟了晶体相体积百分数。由晶格常数及晶体相体积百分数估算了剩余非晶相的成份。用阻抗分析仪测量了纳米晶(Fe1-xCox)78.4Nb2.6Si9B9Cu1合金在10kHz~10MHz范围的磁谱曲线。结果表明，随Co含量的增加，合金的初始磁导率降低，而共振频率明显提高，用畴壁运动方程及畴壁钉扎理论解释了Co含量的变化对纳米晶合金高频磁性的影响规律。
Microstructure and high-frequency magnetic properties were investigated for soft magnetic nanocrystalline (Fe1-xCox78.4)Nb2.6Si9B9Cu1 (x=0.35, 0.5, 0.65) alloys annealed at 490℃for 0.5 hour under vacuum atmosphere (1×10-3Pa). XRD analyzing showed that the α-FeCo(Si) crystallites of about 15 nm were from the amorphous matrix by annealing the samples. With the increasing of Co content, the lattice parameter of α-FeCo(Si) crystallites decreased and the average grain size increased appreciably. Pseudo-Voigt2 function was used to fit the XRD patterns in order to estimate the crystalline volume fraction. The mean composition of the residual amorphous matrix was estimated according to lattice parameter and crystalline volume fraction. Permeability-frequency spectra from 10 kHz to 10 MHz was studied by using an impedance analyzer for nanocrystalline (Fe1-xCox78.4)Nb2.6Si9B9Cu1 alloys. It was shown that with the increasing of Co content, the initial permeability decreased and resonance frequency remarkably increased. The equation of domain wall motion and domain wall pinning mechanism were used to analyze how the high-frequency magnetic property was determined by the Co content for nanocrystalline (Fe1-xCox78.4)Nb2.6Si9B9Cu1 alloys.
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