# Substrate-Controlled Magnetism: Fe nanowires on vicinal Cu surfaces

## TL;DR

This paper demonstrates how vicinal Cu surfaces can be used to control magnetic interactions in Fe nanowires, with potential for stable magnetic configurations at room temperature, using ab initio calculations and Monte Carlo simulations.

## Contribution

It introduces a novel method to tune magnetic properties of Fe nanowires on vicinal Cu surfaces through ab initio calculations and magnetic modeling.

## Key findings

- Magnetic exchange interactions exhibit RKKY oscillations with interwire separation.
- Critical temperatures of Fe nanowires are above room temperature.
- Vicinal Cu surfaces enable control over magnetic coupling.

## Abstract

Here we present a novel approach to control magnetic interactions in atomic-scale nanowires. Our ab initio calculations demonstrate the possibility to tune magnetic properties of Fe nanowires formed on vicinal Cu surfaces. Both intrawire and interwire magnetic exchange parameters are extracted from DFT calculations. This study suggests that the effective interwire magnetic exchange parameters exhibit Ruderman--Kittel--Kasuya--Yosida-like (RKKY) oscillations as a function of Fe interwire separation. The choice of vicinal Cu surface offers possibilities for controlling the magnetic coupling. Furthermore, an anisotropic Heisenberg model was used in Monte Carlo simulations to examine the stability of these magnetic configurations at finite temperature. The predicted critical temperatures of the Fe nanowires on Cu(422) and Cu(533) surfaces are well-above room temperature.