Flat band induced room temperature ferromagnetism in two dimensional systems

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 $600K$ could be reached in micrometer-sized FB systems.

References in corpus (9)

• Magnetic 2D materials and heterostructures
• High temperature fractional quantum Hall states
• Fractional quantum Hall states at zero magnetic field
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• Breaking through the Mermin-Wagner limit in 2D van der Waals magnets
• Effects of correlated disorder on the magnetism of double exchange systems
• Giant boost of the quantum metric in disordered one dimensional flat band systems
• Carrier induced ferromagnetism in the insulating Mn doped III-V semiconductor InP
• RKKY couplings in the Lieb lattice: flat-band induced frustration

Cited by in corpus (8)

• DFT+DMFT investigation of the magnetic phase transition in the itinerant ferromagnet Fe${}_3$GaTe${}_2$
• RKKY interaction in one-dimensional flat-band lattices
• Quantum percolation on Lieb Lattices
• Engineering flux-controlled flat bands and topological states in a Stagome lattice
• Finite temperatures and flat bands: the Hubbard model on three-dimensional Lieb lattices
• Influence of flat bands on RKKY interaction: perspective of Fano defects
• Flux-induced strengthening of the magnetic couplings in a flat-band diamond chain
• Symmetry-Based Real-Space Framework for Realizing Flat Bands and Unveiling Nodal-Line Touchings