A systematic ab initio study on magnetism of the 3d transition metals (TM) from atom to monoatomic wire within density functional theory with generalized gradient approximation (GGA) was performed. The results show that the spin coupling has strong intraatomic exchange strengths about 1 eV for isolated 3d TM atoms. The magnetic moments are distinctly lower than those of free atoms for all dimers except Mn2. All the 3d TM elements exhibit magnetic ground states in the linear wire structure.
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