  The temperature-pressure phase diagram of ferromagnetic superconductor UCoGe
includes four phase transitions. They are between the paramagnetic and the
ferromagnetic states with the subsequent transition in the superconducting
ferromagnetic state and between the normal and the superconducting states after
which has to occur the transition to the superconducting ferromagnetic state.
Here we have developed the Landau theory description of the phase diagram and
established the specific ordering arising at each type of transition.
  The phase transitions to the ferromagnetic superconducting state are
inevitably accompanied by the emergency of screening currents. The
corresponding magnetostatics considerations allow to establish the significant
difference between the transition from the ferromagnetic to the ferromagnetic
superconducting state and the transition from the superconducting to the
ferromagnetic superconducting state.
