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The edge reconstruction of zigzag graphene nanoribbons to a stable line ofalternatively fused seven and five membered rings with hydrogen passivation hasbeen studied within density functional theory with both localized and extendedbasis approximations. Reconstruction of both edges results in a nonmagneticmetallic ground state, whereas the one edge reconstruction stabilizes thesystem in a ferromagnetic metallic ground state. The reconstructed edgesuppresses the local spin density of atoms and contributes finite density ofstates at Fermi energy. Our study paves a new way to fabricate the metallicelectrodes for semiconducting graphene devices with full control over themagnetic behavior without any lattice mismatch between leads and the channel.

Edge reconstruction induces magnetic and metallic behavior in zigzag graphene nanoribbons