Itinerant ferromagnetism in Fermi gas Ideal Fermi gas: Landau diamagnetism 1930 2m x 3m*22N(r) due to the quantization of orbital motions of charged particles Altogether, free electron gas is paramagnetic• Ideal Fermi gas: Landau diamagnetism 1930 due to the quantization of orbital motions of charged particles Altogether, free electron gas is paramagnetic Itinerant ferromagnetism in Fermi gas