  A phenomenological thermodynamic potential was constructed based on the
symmetry analysis and property characterization of bulk DyCo2. An eight-order
polynomial of Landau expansion was employed to describe the thermodynamic
behavior of DyCo2. Several properties were reproduced including ferromagnetic
transition temperature, magnetization curve, temperature dependence of
magnetization. The transition behavior was analyzed via the thermodynamic
potential. The Landau phenomenological thermodynamic model predicts the correct
metamagnetic transition near the Curie temperature.
