▎ 摘　　要

Using first-principles calculations, we have explored the magnetic properties of zigzag edge graphene nanoribbons (ZGNR) with planar tetrahedral coordinated carbon (ptC) or silicon (ptSi). It is observed that the ptC can convert antiferromagnetic-coupled ZGNR into ferromagnetic one, while the ptSi cannot. These contrast results can attribute to the differences between magnetic ptC and non-magnetic ptSi atoms. Moreover, both ZGNR-ptC and ZGNR-ptSi structures are metallic and stable. Thus, the unique magnetic properties and high stabilities of these systems strongly suggest the feasibility of designing novel ferromagnetic devices.