  The Brueckner--Hartree--Fock formalism is applied to study spin polarized
neutron matter properties. Results of the total energy per particle as a
function of the spin polarization and density are presented for two modern
realistic nucleon-nucleon interactions, Nijmegen II and Reid93. We find that
the dependence of the energy on the spin polarization is practically parabolic
in the full range of polarizations. The magnetic susceptibility of the system
is computed. Our results show no indication of a ferromagnetic transition which
becomes even more difficult as the density increases.
