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Suppression of long ranged coupling between magnetic atoms on carbon nanotubes
Author(s) -
Kirwan D. F.,
Rocha C. G.,
Costa A. T.,
Ferreira M. S.
Publication year - 2008
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200879590
Subject(s) - zigzag , carbon nanotube , coupling (piping) , ab initio , ab initio quantum chemistry methods , impurity , nanotube , inductive coupling , metal , condensed matter physics , magnetic moment , materials science , molecular physics , chemical physics , atomic physics , nanotechnology , chemistry , physics , molecule , metallurgy , geometry , mathematics , organic chemistry , quantum mechanics
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)