Divacancy-induced Ferromagnetism in Graphene Nanoribbons

Abstract

Zigzag graphene nanoribb ons have spin-polarized edges, anti-ferromagnetically coupled in the ground state with total spin zero. Customarily, these ribbons are made ferromagnetic by producing an imbalance between the two sublattices. Here we show that zigzag ribbons can be ferromagnetic due to the presence of reconstructed divacancies near one edge. This effect takes place despite the divacancies are produced by removing two atoms from opposite sublattices, being balanced before reconstruction to 5-8-5 defects. We demonstrate that there is a strong interaction between the defect-localized and edge bands which mix and split away from the Fermi level. This splitting is asymmetric, yielding a net edge spin-polarization. Therefore, the formation of reconstructed divacancies close to the edges of the nanoribbons can be a practical way to make them partially ferromagnetic.

References in corpus (14)

• Energy Gaps in Graphene Nanoribbons
• Half-Metallic Graphene Nanoribbons
• The missing atom as a source of carbon magnetism
• Magnetism in graphene nano-islands
• From Point Defects in Graphene to Two-Dimensional Amorphous Carbon
• Disorder Induced Localized States in Graphene
• Enhanced Half-Metallicity in Edge-Oxidized Zigzag Graphene Nanoribbons
• Vacancy induced magnetism in graphene and graphene ribbons
• Electronic and structural characterization of divacancies in irradiated graphene
• Carbon nanoelectronics: unzipping tubes into graphene ribbons
• Magnetic moments in the presence of topological defects in graphene
• Edge states and flat bands in graphene nanoribbons with arbitrary geometries
• Zigzag graphene nanoribbon edge reconstruction with Stone-Wales defects
• One-dimensional quantum channel in a graphene line defect

Cited by in corpus (5)

• Magnetic Phases of Graphene Nanoribbons under Potential Fluctuations
• Effects of random atomic disorder on the magnetic stability of graphene nanoribbons with zigzag edges
• Tuning magnetism in graphene nanoribbons via strain and adatoms
• Generation of coherent radiation by magnetization reversal in graphene
• Probing divacancy defects in a zigzag graphene nanoribbon through RKKY exchange interaction