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Magnetic Moment of Iron
Ferromagnetism has its quantum mechanic origin in the difference of spin-up and spin-down
electron densities. It is driven by a balance between a gain in exchange energy due to larger spin-
polarization and a loss in Coulomb repulsion and kinetic energy of the electron system.
Spin-density functional theory is able to predict magnetic moments with astounding accuracy.
The present case illustrates this capability for bulk iron.