Interface induced room-temperature ferromagnetism in hydrogenated epitaxial graphene

Abstract

Due to the predominantly surface character of graphene, it is highly suitable for functionalization with external atoms and/or molecules leading to a plethora of new and interesting phenomena. Here we show ferromagnetic properties of hydrogen-functionalized epitaxial graphene on SiC. Ferromagnetism in such a material is not directly evident as it is inherently composed of only non-magnetic constituents. Our results nevertheless show strong ferromagnetism, which cannot be explained by simple magnetic impurities. The ferromagnetism is unique to hydrogenated epitaxial graphene on SiC, where interactions with the interfacial buffer layer play a crucial role. We argue that the origin of the observed ferromagnetism is governed by electron correlation effects of the narrow Si-dangling-bond (Si-DB) states in the buffer layer exchange-coupled to localized states in the hydrogenated graphene layer. This forms a quasi-three-dimensional ferromagnet with a Curie temperature higher than 300 K.

23 pages, 7 figures, including supplementary information

References in corpus (7)

• Half-Metallic Graphene Nanoribbons
• Emergence of magnetism in graphene materials and nanostructures
• Hydrogen on graphene: Electronic structure, total energy, structural distortions, and magnetism from first-principles calculations
• Evidence of structural strain in epitaxial graphene layers on 6H-SiC(0001)
• Diluted Graphene Antiferromagnet
• Long spin relaxation times in wafer scale epitaxial graphene on SiC(0001)
• Localized states influence spin transport in epitaxial graphene

Cited by in corpus (21)

• Graphene Spintronics
• Two dimensional magnets: Forgotten history and recent progress towards spintronic applications
• Proximity induced room-temperature ferromagnetism in graphene probed with spin currents
• Ferromagnetism and conductivity in atomically thin SrRuO3
• Correlation-driven eightfold magnetic anisotropy in a two-dimensional oxide monolayer
• Strain induced edge magnetism at zigzag edge in graphene quantum dot
• Modeling Ferro- and Antiferromagnetic Interactions in Metal-Organic Coordination Networks
• Proximity magnetoresistance in graphene induced by magnetic insulators
• Spintronics with graphene quantum dots
• Ferromagnetism and superconductivity with possible $p+ip$ pairing symmetry in partially hydrogenated graphene
• A stable path to ferromagnetic hydrogenated graphene growth
• Electric Contributions to Magnetic Force Microscopy Response from Graphene and MoS2 Nanosheets
• Strain-tuning of edge magnetism in zigzag graphene nanoribbons
• Gate-tunable magnetism of C adatoms on graphene
• Gate-independent energy gap in non-covalently intercalated bilayer graphene on SiC(0001)
• Exotic spintronic properties of transition-metal monolayers on graphyne
• Observation of anomalous Hanle spin precession lineshapes resulting from interaction with localized states
• Controlling Spin-Polarization in Graphene by Cloaking Magnetic and Spin-Orbit Scatterers
• Monovacancy paramagnetism in neutron-irradiated graphite probed by ${}^{13}$C NMR
• Novel mechanism for weak magnetization with high Curie temperature observed in H-adsorption on graphene
• Metal adsorbate interactions and the convergence of density functional calculations