  Magnetic order and excitations in multiferroic DyMnO3 were studied by neutron
scattering experiments using a single crystal prepared with enriched 162Dy
isotope. The ordering of Mn moments exhibits pronounced hysteresis arising from
the interplay between Mn and Dy magnetism which possesses a strong impact on
the ferroelectric polarization. The magnon dispersion resembles that reported
for TbMnO3. We identify the excitations at the magnetic zone center and near
the zone boundary in the b direction, which can possess electromagnon
character. The lowest frequency of the zone-center magnons is in good agreement
with a signal in a recent optical measurement so that this mode can be
identified as the electromagnon coupled by the same Dzyaloshinski-Moriya
interaction as the static multiferroic phase.
