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Sep20-04, 06:45 PM
Well, it could be argued that in magnets, the normals to each orbit are aligned (same z), while in all other materials, they are not (random z). Again, I don't claim this to be a sufficient explanation to a scientist, but it is one I that have seen in a (perhaps an elementary) physics textbook. I am not sure where exactly the theory fails, although it surely does at some point.
It fails because for an s-orbital, there are no prefered direction of symmetry. So even if they are all "alligned", you still get no net magnetic moment due to all of those "revolution" around the nuclei.