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Nature 428, 481 (1 April 2004) | doi:10.1038/428481a

Nanoscale physics:  Big moment for nanotubes

May Chiao

As an electron whizzes around the nucleus of an atom, it develops a magnetic signal known as an orbital magnetic moment. The size of the moment depends on the outer diameter of the electron's orbit, which is fixed by the size of the atom.

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