  We study the magnetic susceptibility at large 't Hooft coupling by computing
the correlation function of the magnetizations in the strongly coupled Maxwell
theory in large-N limit with finite temperature and chemical potential, within
the framework of the AdS/CFT correspondence. We show that in strong coupling
limit the magnetic susceptibility is independent to the temperature and be
universal, measured in the unit of magnetic permeability of the bulk space. A
comparison with the weak coupling system, the Pauli paramagnetic
susceptibility, is also discussed.
