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A type of line defect (LD) composed of alternate squares and octagons (4-8)as the basic unit is currently an experimentally available topological defectin graphene lattice, which brings some interesting modification to magnetic andelectronic properties of graphene. The transitional metal (TM) adsorb ongraphene with line-defect (4-8), and they show interesting and attractivestructural, magnetic and electronic properties. For different TMs such as Fe,Co, Mn, Ni and V, the complex systems show different magnetic and electronicproperties. The TM atoms can spontaneously adsorb at quadrangular sites,forming an atomic chain along LD on graphene. The most stable configuration ishollow site of regular tangle. The TMs (TM = Co, Fe, Mn, Ni, V) tend to formextended metal lines, showing ferromagnetic (FM) ground state. For Co, Fe, andV atom, the system are half-metal. The spin-{\alpha} electron is insulating,while spin-\b{eta} electron is conductive. For Mn and Ni atom, Mn-LD and Ni-LDpresent spin-polarized metal; For Fe atom, the Fe-LD shows semimetal with Diraccones. For Fe and V atom, both Fe-LD and V-LD show spin-polarized half-metallicproperties. And its spin-{\alpha} electron is conducting, while spin-\b{eta}electron is insulating. Different TMs adsorbing on graphene nanoribbon formingsame stable configurations of metal lines, show different electronicproperties. The adsorption of TMs introduces magnetism and spin-polarization.These metal lines have potential application in spintronic devices, and work asquasi-one-dimensional metallic wire, which may form building blocks foratomic-scale electrons with well-controlled contacts at atomic level.

First-principles study of 3d transition metal atom adsorption onto graphene: the role of the extended line defect