Magnetism of armchair graphene nanoribbons attached with O, CH_2, or NH radical groups are investigated within the framework of density functional theory. A variety of interesting band structures of semimetals, spin gapless semiconductors, and semiconductors are obtained. Among the three radical groups considered, CH_2 can induce the strongest magnetism with 2~(μB) magnetic moment per group. The magnetism is found to come from the unsaturated states on the C atoms at the edges and in the radical groups. No spin polarization is triggered in the ribbons with NH radicals. Our study provides a possible way to carry out ~(d0) magnetism in armchair graphene nanoribbons.
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