Flat band induced room temperature ferromagnetism in two dimensional systems

TL;DR

This paper demonstrates that flat bands in two-dimensional materials can induce room temperature ferromagnetism, with potential crossover temperatures reaching up to 600 K, significantly surpassing current experimental results.

Contribution

It reveals that flat bands can enable high-temperature ferromagnetism in 2D materials, a novel mechanism for magnetic order at room temperature.

Findings

Flat bands induce ferromagnetic exchange interactions.

Crossover temperatures up to 600 K are predicted.

Ferromagnetism scales linearly with local coupling.

Abstract

The remarkable and fascinating properties of two-dimensional materials have raised them to the rank of most promising candidates for technological applications. In particular, the possibility of long-range ferromagnetic order in 2D materials is generating a growing excitement. Here, we demonstrate that flat bands (FBs) may pave the way to room temperature ferromagnetism in 2D compounds. Indeed, the magnetic exchanges between localized spins are largely dominated by the FB-FB contribution. This contribution is ferromagnetic and scales linearly with the local coupling, thus leading to cross-over temperatures (ferromagnetic phase/ paramagnetic phase) higher by an order of magnitude than those currently reported in experiments. Cross-over temperatures as high as $600~ K$ could be reached in micrometer-sized FB systems.