Isolated magnetic moment. interactions: dipolar interaction, exchange interaction and spin-orbit coupling interaction. environments: crystal field interaction (octa and tetrahedral environments). magnetism in metals : Landau diamagnetism and Pauli paramagnetism, De haas-van Alphan effect. order and magnetic structure: Ferromagnetic and anti-ferromagnetic materials, Weiss model. order and broken symmetry: Magnons and Bloch's law, Landau theory of ferromagntism, Ising model, tight bindingin magnetism, Hubbard model and Stoner criterion.