无序$Fe_{1-x}Ru_x$合金内禀磁性的平均场理论研究
Theoretical study of the intrinsic magnetic properties of disordered $Fe_{1-x}Ru_x$ alloys: a mean-field approach
摘要：
采用基于Bogoliubov不等式的平均场近似方法研究了$Fe_{1-x}Ru_x$合金系统0 $\leq$ x $\leq$ 0.10的磁性.铁磁Fe-Fe自旋关联和反铁磁Fe-Ru和Ru-Ru交换被用来描述居里温度和低温磁化强度的温度依赖性。一个组成的依赖性已被施加在交换耦合，如实验所示。从最小二乘拟合过程的实验结果的相互作用参数的估计，得到的磁化强度和铁磁居里温度的温度依赖性低。得到了良好的协议与现有的实验结果。
英文摘要：
The magnetic properties of the $Fe_{1-x}Ru_x$ alloy system for 0 $\leq$ x $\leq$ 0.10 are studied by using a mean-field approximation based on the Bogoliubov inequality. Ferromagnetic Fe-Fe spin correlations and antiferromagnetic Fe-Ru and Ru-Ru exchanges have been considered to describe the temperature dependence of the Curie temperature and low temperature magnetization. A composition dependence has been imposed in the exchange couplings, as indicated by experiments. From a least-square fitting procedure to the experimental results an estimation of the interaction parameters was obtained, which yielded the low temperature dependence of the magnetization and of the ferromagnetic Curie temperature. A good agreement was obtained with available experimental results.
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