  The dynamical steady state behaviour of the random field
  Ising ferromagnet swept by a propagating magnetic field wave is studied at
zero temperature by Monte Carlo simulation in two dimensions. The distribution
of the random field is bimodal type. For a fixed set of values of the frequency
and wavelength of propagating magnetic field wave and the strength of the
random field, four distinct dynamical steady states or nonequilibrium phases
were identified. These four nonequilibrium phases are characterised by
different values of structure factors. State of first kind, where all spins are
parallel (up). The second one is, the propagating type, where the sharp strips
formed by parallel spins are found to move coherently. The third one is also
propagating type, where the boundary of the strips of spins is not very sharp.
The fourth kind, shows no propagation of stripes of magnetic spins, forming a
homogeneous distribution of up and down spins. This is disordered phase The
appearance of these four dynamical phases or modes depends on the value of the
amplitude of propagating magnetic field wave and the strength of random
(static) field. A phase diagram has also been drawn, in the plane formed by the
amplitude of propagating field and the strength of random field. It is checked
that, the existence of these dynamical phases is neither a finite size effect
nor a transient phenomenon.
