Amorphous Fe_xNi_80−xB₁₂Si₈ alloys with 2.4 ≤ x ≤ 16 were fabricated using a melt spinning technique and their magnetic properties were investigated under high magnetic field up to 160 kOe, at different temperatures with x = 2.4, 8 and 16. The temperature dependence of the magnetization was found to follow a mean field model from which we have calculated the exchange constant A from the fits of the experimental results. Using the approach to the saturation magnetization law, some important parameters were determined, such as the local random anisotropy constant and the local correlation length of anisotropy. It is found that the Curie temperature T_C, exchange energy, random local anisotropy constant K_L and the ferromagnetic correlation R_f increase with increasing Fe concentration.

非晶态Fe _X镍_{80- X}乙₁₂的Si _8种合金2.4≤  X  ≤16使用熔融纺丝技术制备了，并且在高磁场他们的磁特性进行了研究，以160千奥斯特，在不同温度下用X  = 2.4，图8和16.发现磁化强度的温度依赖性遵循平均场模型，根据该模型我们根据实验结果拟合计算出交换常数A。利用饱和磁化定律的方法，确定了一些重要的参数，如局部随机各向异性常数和各向异性的局部相关长度。发现居里温度T_C，交换能量，随机局部各向异性常数K _L和铁磁相关性R _f随着Fe浓度的增加而增加。