Zdyb Ryszard, Palotás Krisztián, Simon Eszter, Jaroch Tomasz, Korczak Zbigniew
Institute of Physics, Maria Curie-Sklodowska University, 20-031 Lublin, Poland.
Wigner Research Center for Physics, Institute for Solid State Physics and Optics, Konkoly-Thege M. Str. 29-33, 1121 Budapest, Hungary.
Materials (Basel). 2022 Jan 28;15(3):1019. doi: 10.3390/ma15031019.
The crystallographic and magnetic properties of an Fe monolayer (ML) grown on 2 ML Au/W(110) substrate are studied with spin-polarized low-energy electron microscopy, density functional theory, and relativistic screened Korringa-Kohn-Rostoker calculations. The single layer of iron atoms possesses hexagonal symmetry and reveals a ferromagnetic order at room temperature. We experimentally demonstrate the possibility of tuning the Curie temperature and the magnitude of magnetization of the Fe monolayer by capping with Au. Taking into account several structural models, the calculation results mostly show ferromagnetic states with enhanced magnetic moments of Fe atoms compared to their bulk value and a further increase in their value after covering with Au. The theoretically calculated Curie temperatures are in fair agreement with those obtained in the experiments. The calculations, furthermore, found evidence for the presence of frustrated isotropic Fe-Fe exchange interactions, and a discussion of the structural effects on the magnetic properties is provided herein.
利用自旋极化低能电子显微镜、密度泛函理论和相对论屏蔽的科林加 - 科恩 - 罗斯托克尔计算方法，研究了生长在2 ML Au/W(110)衬底上的铁单层（ML）的晶体学和磁性。铁原子单层具有六边形对称性，并且在室温下呈现铁磁有序。我们通过实验证明了用金覆盖来调节铁单层居里温度和磁化强度大小的可能性。考虑到几种结构模型，计算结果大多显示出与体相值相比铁原子磁矩增强的铁磁态，并且在用金覆盖后其值进一步增加。理论计算的居里温度与实验获得的结果相当吻合。此外，计算发现了存在受挫的各向同性铁 - 铁交换相互作用的证据，并在此提供了对磁性结构效应的讨论。
