The fabrication and development of high-entropy alloys (HEAs) with exceptional functionalities is a rapidly expanding field with numerous applications. When the role of entropy in HEAs is considered, the extrinsic factors, such as the existence of grains and different phases, need to be separated from the intrinsic configurations of the atomic lattice. Here, we fabricated the CoCrFeNi₂Al_0.5 HEA/muscovite heterostructures, and some were prepared as epitaxial bilayers and others were prepared as an amorphous system. These two systems are classified into atomic-site disordered (ASD) and structurally disordered (SD) states, respectively, without the extrinsic effects for the determination of the crystal lattice role in high-entropy states. In this study, we determined the role of the structure order in correlation with the structural, electronic, and magnetic properties of HEAs using a combination of energy-dispersive X-ray spectrometry, X-ray diffraction, transmission electron microscopy, magneto-transport, ac magnetometry, and X-ray absorption spectroscopy with magnetic circular dichroism. The ASD state showed fully metallic behavior. In contrast, the SD state showed a metallic behavior with intense magnetic saturation, which was called Kondo-like behavior, under 50 K with a low-temperature coefficient of resistivity of ~64 ppm/°C. The difference between the saturation magnetic moment and the electron relaxation behavior in the ASD and SD states resulted from the existence of the structural order affecting the atomic distance and periodicity to modify the exchange interaction and tune the electron-phonon interaction for scattering. The ferromagnetic behavior contributed by Co, Fe, and Ni atoms was probed by X-ray absorption and magnetic circular dichroism to understand the magnetic interactions in the ASD and SD states.

具有卓越功能的高熵合金 (HEA) 的制造和开发是一个快速扩展的领域，具有众多应用。当考虑熵在 HEA 中的作用时，外在因素（例如晶粒和不同相的存在）需要与原子晶格的内在构型分开。在这里，我们制备了CoCrFeNi ₂ Al _0.5 HEA/白云母异质结构，其中一些制备为外延双层，另一些制备为非晶体系。这两个系统分别分为原子位点无序（ASD）和结构无序（SD）状态，没有外在效应来确定高熵状态下的晶格作用。在这项研究中，我们结合能量色散 X 射线光谱、X 射线衍射、透射电子显微镜、磁传输、交流磁力测定法和具有磁圆二色性的 X 射线吸收光谱法。ASD 状态表现出完全金属行为。相比之下，SD 态在 50 K 下表现出强烈磁饱和的金属行为，称为类近藤行为，电阻率温度系数约为 64 ppm/°C。ASD 和 SD 状态下饱和磁矩和电子弛豫行为之间的差异是由于影响原子距离和周期性的结构有序的存在来改变交换相互作用并调整电子-声子相互作用以进行散射。通过 X 射线吸收和磁圆二色性探测 Co、Fe 和 Ni 原子贡献的铁磁行为，以了解 ASD 和 SD 状态下的磁相互作用。