Ferromagnetism for 3d, 4f metals

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Why Fe, Co and Ni are ferromagnetic? what aspects of their electronic structure favors ferromagnetism? How 3d or 4f metals can be ferromagnetic and what is their origin of
ferromagnetism?
 
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what is the difference of the origin of ferromagnetism for 3d and 4f metals?
 

Thread 'Stability of persistent currents in superconductors regardless of temperature'

From the BCS theory of superconductivity is well known that the superfluid density smoothly decreases with increasing temperature. Annihilated superfluid carriers become normal and lose their momenta on lattice atoms. So if we induce a persistent supercurrent in a ring below Tc and after that slowly increase the temperature, we must observe a decrease in the actual supercurrent, because the density of electron pairs and total supercurrent momentum decrease. However, this supercurrent...
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