  We study thermodynamic properties of dyonic black hole and its dual field
theory. We observe that the phase diagram of a dyonic black hole in constant
electric potential and magnetic charge ensemble is similar to that of a Van der
Waals fluid with chemical potential. Phase transitions and other critical
phenomena have been studied in presence of magnetic charge and chemical
potential. We also analyse magnetic properties of dual conformal field theory
and observe a ferromagnetic like behavior of boundary theory when the external
magnetic field vanishes. Finally, we compute susceptibility of different phases
of boundary CFT and find that, depending on the strength of the external
magnetic field and temperature, these phases are either paramagnetic or
diamagnetic.
