论文标题
$（fe_ {1-x} Mn_x）_2alb_2 $的磁性特性和替代对磁性效应的影响
Magnetic properties of $(Fe_{1-x}Mn_x)_2AlB_2$ and the impact of substitution on the magnetocaloric effect
论文作者
论文摘要
在这项工作中，我们研究了$（fe_ {1-x} Mn_x）_2alb_2 $ $ x = 0 $ to $ 1 $范围的磁性结构，使用X射线和中子衍射，磁化测量值和平均值范围理论计算。虽然已知$ fe_2alb_2 $和$ mn_2alb_2 $分别是铁磁（FM）和反铁磁性（AFM），但此处，我们专注于其实心解决方案的磁性结构，这是不充分理解的。 $ fe_2alb_2 $的FM接地状态在$ x \ 0.2 $上变成一个倾斜的AFM，单调减少FM组件，直到$ x \约0.5 $。 FM过渡温度（$ t_c $）随着$ x $的增加而线性降低。磁矩和结构的这些变化反映在晶格参数的异常膨胀中，表明磁弹性耦合。最后，探索了固体溶液的磁性特性。对于$ x = 0.2 $，等温熵变化比$ fe_2alb_2 $要小30％，而由于过渡的温度范围扩大，相对冷却功率较大6％。
In this work, we investigate the magnetic structures of $(Fe_{1-x}Mn_x)_2AlB_2$ solid-solution quaternaries in the $x = 0$ to $1$ range using x-ray and neutron diffraction, magnetization measurements, and mean-field theory calculations. While $Fe_2AlB_2$ and $Mn_2AlB_2$ are known to be ferromagnetic (FM) and antiferromagnetic (AFM), respectively, herein we focused on the magnetic structure of their solid solutions, which is not well understood. The FM ground state of $Fe_2AlB_2$ becomes a canted AFM at $x \approx 0.2$, with a monotonically diminishing FM component until $x \approx 0.5$. The FM transition temperature ($T_C$) decreases linearly with increasing $x$. These changes in magnetic moments and structures are reflected in anomalous expansions of the lattice parameters, indicating a magnetoelastic coupling. Lastly, the magnetocaloric properties of the solid solutions were explored. For $x = 0.2$ the isothermal entropy change is smaller by 30% than it is for $Fe_2AlB_2$, while the relative cooling power is larger by 6%, due to broadening of the temperature range of the transition.
