  The influence of scalar field interactions in the magnetic catalysis
phenomenom is studied in a gauge theory with scalar and fermion fields. It is
shown that the external magnetic field catalyzes the appearance of a
fermion-antifermion condensate along with a non-zero scalar vev, hence
generating a fermion dynamical mass and breaking the discrete chiral symmetry
of the theory. The model does not require the introduction of a scalar mass
term with a wrong sign in the original Lagrangian to generate the scalar vev,
nor does it exhibit dimensional transmutation ''a la Coleman-Weinberg.'' The
scalar vev noticeably enhances the dynamically generated fermion mass. Possible
cosmological applications of these results are suggested.
