We study the critical exponents in amorphous Fe_xNi_80-xB₁₂Si₈ alloys with (x = 2.4, 8 and 16) around ferromagnetic (FM) to paramagnetic (PM) phase transition temperature. The melt spinning method has been used to synthesize the amorphous alloy. The magnetic transition nature undergoes a second-order magnetic phase transition from ferromagnetic to paramagnetic states. The critical exponents were analyzed utilizing the modified Arrott plot technique (MAP), the Widom scaling relation (WSR), and the critical isotherm analysis (CIA). Besides, a separate analysis of the critical performance is presented in terms of the magnetocaloric effect (MCE). It was found to be in line with the conclusion drawn from magnetization data analysis. The determined critical exponent values were found to be consistent and comparable with those predicted by mean field approach. This result emphasizes that the ferromagnetic exchange interaction is of the long range type.

我们研究了非晶态Fe _x Ni _80-x B ₁₂ Si _8中的临界指数合金（x = 2.4、8和16）在铁磁（FM）到顺磁（PM）的相变温度附近。熔融纺丝法已经用于合成非晶态合金。磁跃迁性质经历了从铁磁态到顺磁态的二次磁相变。使用改进的Arrott图技术（MAP），Widom比例关系（WSR）和临界等温线分析（CIA）分析了临界指数。此外，根据磁热效应（MCE）提出了对关键性能的单独分析。发现与磁化数据分析得出的结论相符。发现确定的临界指数值与通过均值场法预测的临界指数值一致且可比。