  In the recently years it has been argued that spectators in heavy ion
collisions are responsible for creating a strong magnetic field that could play
an important role in the QCD phase transition. In this work we use the SU(2)
Nambu--Jona-Lasinio (NJL) model in order to study the chiral transition in
quark matter subject to a strong magnetic field. We show some results involving
the breaking of chiral symmetry and its restoration at finite temperature and
density.
