Costa, A. T., Rocha, C. G. and Ferreira, M. S. ‘Non-collinear coupling between magnetic adatoms in carbon nanotubes’ in Physical Review B, 76, (8), 2007, pp 5401- 5406
Physical Review B 76 8
The long-range character of the exchange coupling between localized magnetic moments indirectly mediated
by the conduction electrons of metallic hosts often plays a significant role in determining the magnetic order of
low-dimensional structures. In addition to this indirect coupling, here we show that the direct exchange
interaction that arises when the moments are not too far apart may induce a noncollinear magnetic order that
cannot be characterized by a Heisenberg-like interaction between the magnetic moments. We argue that this
effect can be manipulated to control the magnetization alignment of magnetic dimers adsorbed on the walls of
carbon nanotubes. Our results show that the magnetic coupling cannot be inferred only by total-energy differences
between the ferromagnetic and antiferromagnetic configurations, the possibility of noncollinear alignments
suggesting this to be a misleading practice
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