Dilute magnetism in graphene

Abstract

The phase diagram of graphene decorated with magnetic adatoms distributed either on a single sublattice, or evenly over the two sublattices, is computed for adatom concentrations as low as $\sim 1\%$. Within the framework of the $s$-$d$ interaction, we take into account disorder effects due to the random positioning of the adatoms and/or to the thermal fluctuations in the direction of magnetic moments. Despite the presence of disorder, the magnetic phases are shown to be stable down to the lowest concentration accessed here. This result agrees with several experimental observations where adatom decorated graphene has been shown to have a magnetic response. In particular, the present theory provides a qualitative understanding for the results of Hwang et al. [Sci. Rep. 6, 21460 (2016)], where a ferromagnetic phase has been found below $\sim 30\text{K}$ for graphene decorated with S-atoms.

12 pages, 8 figures

References in corpus (11)

• Two Dimensional Atomic Crystals
• Control of graphene's properties by reversible hydrogenation
• Room-Temperature Quantum Hall Effect in Graphene
• Graphane: a two-dimensional hydrocarbon
• Magnetism in Graphene Induced by Single-Atom Defects
• Limits on intrinsic magnetism in graphene
• RKKY Interaction in Graphene from Lattice Green's Function
• Tuning Kondo physics in Graphene with gate voltage
• Evidence for spin-flip scattering and local moments in dilute fluorinated graphene
• Finite temperature ordering of dilute graphene antiferromagnets
• Spin-Polarized Semiconductor Induced by Magnetic Impurities in Graphene