The following is a context I've read in some electromagnetics reference book:

"According to a simplified atomic model, the electrons associated with a
particulatr nucleus orbit around the nucleus in circular paths while spinning
about themselves. In addition, the nucleus itself has a spin motion associated
with it. Since the movement of charge constitutes a current, these orbital and
spin motions are equivalent to current loops of atmoic dimensions. Thus, each
atom can be characterized by a superposition of magnetic dipole moments
corresponding to the electron orbital motions, electron spin motions, and the
nuclear spin."

I can understand that orbital motion of electron could be taken as a current
loop so that contribute to the magnetic dipole moment.

But why could the spin motions of electron and nucleus itself also have the
effects on the magnetic dipole moment?



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