  By using the Newman-Penrose formalism and 't Hooft brick-wall model, the
quantum entropies of the Kerr-Newman black hole due to the Dirac and
electromagnetic fields are calculated and the effects of the spins of the
photons and Dirac particles on the entropies are investigated. It is shown that
the entropies depend only on the square of the spins of the particles and the
contribution of the spins is dependent on the rotation of the black hole,
except that different fields obey different statistics.
