Suppression of long ranged coupling between magnetic atoms on carbon nanotubes

Indirect exchange coupling plays a central role in determining the magnetic order in systems composed of adsorbed magnetic moments on a metallic host. For low dimensional metallic structures, such as nanotubes, this interaction is predicted to decay slowly. Ab‐initio calculations have nevertheless b...

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Published in:Physica Status Solidi (b) 2008-10, Vol.245 (10), p.2169-2172
Main Authors: Kirwan, D. F., Rocha, C. G., Costa, A. T., Ferreira, M. S.
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Language:English
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73.63.Fg
75.75.+a
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Physics
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description Indirect exchange coupling plays a central role in determining the magnetic order in systems composed of adsorbed magnetic moments on a metallic host. For low dimensional metallic structures, such as nanotubes, this interaction is predicted to decay slowly. Ab‐initio calculations have nevertheless been unable to reproduce this prediction. We show that for Armchair and Zigzag Nanotubes the rate of decay is very sensitive to the location of the impurities within the nanotube host, the range being much shorter when the impurities are located in the centre of a nanotube hexagon. This explains the difficulty in probing the long range character of the indirect exchange coupling from standard ab‐initio calculations. In so doing, we confirm the general long‐ranged character of the coupling but provide a condition for observing shorter range decay. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
doi_str_mv 10.1002/pssb.200879590
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subjects 73.63.Fg
75.75.+a
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic properties and materials
Magnetic properties of nanostructures
Physics
title Suppression of long ranged coupling between magnetic atoms on carbon nanotubes
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