  Crossing and anti-crossing effects in dispersion characteristics of both bulk
and surface polaritons in a magnetic-semiconductor superlattice influenced by
an external static magnetic field being in the Faraday geometry are discussed.
The bulk polaritons are classified as eigenwaves with right-handed and
left-handed elliptically polarized states, whereas the surface polaritons are
considered as hybrid modes having a predominant effect of either magnetic or
semiconductor subsystem, and distinctions in dispersion characteristics of such
polaritons are revealed involving the concept of critical points.
