Abstract
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.
Highlights
Received: 9 November 2021The Curie temperature and the magnitude of magnetization are among the most important properties of ferromagnetic ultrathin films, which define their usefulness in technology
In real systems ferromagnetic films are formed on substrates, which act as a source of anisotropy, but due to the finite-size effects, the Curie temperature becomes strongly reduced and usually is well below room temperature (RT)
We have investigated changes in the Curie temperature and magnitude of magnetization of 1 ML Fe grown on 2 ML Au/W(110) induced by the adsorption of Au
Summary
The Curie temperature and the magnitude of magnetization are among the most important properties of ferromagnetic ultrathin films, which define their usefulness in technology. It is well known that they strongly depend on the layers’ crystallographic properties, including the type of structure (fcc, hcp, etc.), crystal face, and the distance between atoms. It is known that as the thickness of the film decreases down to a single atom limit, its magnetic properties drastically change. In the presence of a strong enough anisotropy, thermal fluctuations can be overcome, resulting in the appearance of a longrange order of the magnetic moments. In real systems ferromagnetic films are formed on substrates, which act as a source of anisotropy, but due to the finite-size effects, the Curie temperature becomes strongly reduced and usually is well below room temperature (RT)
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