[spirochete]

Elemental iron has a much larger magnetic moment than Fe(II) and Fe(III) complexes.  Why?

Magnetism is caused by unpaired electrons, but electron configurations don't explain it. 

Is it because elemental iron is more ferromagnetic while the Ionic complexes are para and/or antiferromagnetic?  If so, why would that be?

[ARGOS++]

Dear spirochete;

The property of ferromagnetism (also for iron) is NOT ONLY due to the direct influence of two effects from quantum mechanics: spin and the Pauli Exclusion Principle, as Wiki is telling us:

http://en.wikipedia.org/wiki/Ferromagnet

Hope to have been of help to you.
Good Luck!
                    ARGOS⁺⁺