Magnetism in systems with various dimensionalities: A comparison between Fe and Co

Abstract

A systematic ab initio study is performed for the spin and orbital moments and for the validity of the sum rules for x-ray magnetic circular dichroism for Fe systems with various dimensionalities (bulk, Pt-supported monolayers and monatomic wires, free-standing monolayers and monatomic wires). Qualitatively, the results are similar to those for the respective Co systems, with the main difference that for the monatomic Fe wires, the ?Tz? term in the spin sum rule is much larger than that for the Co wires. The spin and orbital moments induced in the Pt substrate are also discussed.