A concise description of paramagnetism in ideal non-interacting ions, pauli paramagnetism and permanent atomic diamagnetism. I derive the magnetic susceptibility () in each case and describe how it is dependant on temperature. In the case of paramagnetism in ideal non-interacting ions this leads to the Curie Law. These notes also contain a worked example of applying Hund’s rules to nickel, a description of magnetic thermodynamics and outlines an experiment for determining the susceptibility of...