# Ferromagnetism in Two-Dimensional Dysprosium–Platinum Surface Alloy

## TL;DR

This paper studies a 2D dysprosium–platinum alloy's magnetic properties and structure for potential use in magnetic cluster arrays.

## Contribution

The discovery of ferromagnetism in 2D DyPt2 with in-plane magnetization and low Curie temperature.

## Key findings

- Single and triple layers of DyPt2 exhibit ferromagnetism with in-plane easy magnetization.
- Electronic structures of DyPt2 layers show modulated coupling with the substrate via moiré patterns.

## Abstract

In this study, we comprehensively analyze single and
triple layers
of a new two-dimensional surface alloy, namely DyPt2. Both
are ferromagnetic materials with an in-plane easy magnetization axis
and low Curie temperature on the order of a few Kelvins. Magnetic
and electronic properties confirm weak interlayer coupling and the
dominance of interactions within alloy layers. Atomic-scale investigation
proved nearly the same atomic structure of the termination layer and
varying moiré patterns. The electronic structures of single
and triple layer DyPt2 are similar, consisting of a mixture
of Dy and Pt electronic states. The intensity of these electronic
states varies within the moiré pattern, similar to the surface
local work function, demonstrating modulated coupling between the
surface alloy and the substrate. The presented results provide essential
knowledge for further research of this system in terms of its application
in the growth of densely packed arrays of magnetic clusters and molecules.