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Carbon encapsulated iron nanowires

Ramirez R., Weissmann M., Garcia G., Kiwi M.

Materials Science Poland

2006

Vol. 24, No. 4

883--890

A study of the structural and magnetic properties of carbon encapsulated iron nanowires is presented. The influence of carbon presence on iron magnetic ordering by means of an ab initio computer simulation has been studied. For wires tightly encapsulated, i.e. with large ratio of wires and nanotubes radii, the presence of carbon strongly alters Fe magnetic configuration of free standing wires, in some cases yielding antiferromagnetic ordering. The energy differences between ferromagnetic and antiferromagnetic phases are small enough to allow their coexistence in a nanowire, which is in agreement with the experimental evidence of exchange-bias in such systems.