Itinerant ferromagnetism in Fermi gas Ideal fermi gas Pauli paramagnetism 1927 x=2UN(Gr) where N(EF)is the density of state at Fermi surface 'B is the bohr magneton due to the intrinsic magnetic moment of electrons• Ideal fermi gas: Pauli paramagnetism 1927 where is the density of state at Fermi surface is the Bohr magneton due to the intrinsic magnetic moment of electrons Itinerant ferromagnetism in Fermi gas