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Carbon nanostructures with unusually large paramagnetic moments have been discovered in a theoretical study of the electronic and magnetic properties of carbon nanotubes bent into toroids. Specifically, nanotori formed from metallic nanotubes with λF0ex0ex=0ex0ex3T, where λF is the Fermi wavelength and T the translation vector of the nanotube, exhibit giant paramagnetic moments at selected radii (``magic radii''), while the ones with λF0ex0ex=0ex0exT are paramagnetic at any radius. The large paramagnetic moment is due to the interplay between the toroidal geometry and the ballistic motion of the π electrons in the metallic nanotube.
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Liu et al. (2002) studied this question.
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