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Contrary to the antiferromagnetic and insulating character of bulk NiO,one-dimensional chains of this material can become half-metallic due to thelower coordination of their atoms. Here we present ab initio electronicstructure and quantum transport calculations of ideal infinitely long NiOchains and of more realistic short ones suspended between Ni electrodes. Whileinfinite chains are insulating, short suspended chains are half-metallicminority-spin conductors which display very large magnetoresistance and aspin-valve behaviour controlled by a single atom.Comment: 5 pages, 4 figures; accepted version; minor changes in introduction  and reference

Emergence of half-metallicity in suspended NiO chains:Ab initioelectronic structure and quantum transport calculations