  The Heisenberg ferromagnet (uniaxially anisotropic along z-direction), in the
presence of time dependent (but uniform over space) magnetic field, is studied
by Monte Carlo simulation. The time dependent magnetic field was taken as
elliptically polarised in such a way that the resulting field vector rotates in
the XZ plane. In the limit of low anisotropy, the dynamical responses of the
system are studied as functions of temperature and the amplitudes of the
magnetic field. As the temperature decreases, it aws found that the system
undergoes multiple dynamical phase transitions. In this limit, the multiple
transitions were studied in details and the phase diagram for this observed
multicritical behaviour was drawn in the field amplitude and temperature
palne.The natures (continuous/discontinuous) of the transitions are determined
by the temperature variations of fourth order Binder cumulant ratio and the
distributions of the order parameter near the transition points. The
transitions are supported by finite size study. The temperature variations of
the variances of dynamic order parameter components (for different system
sizes) indicate the existence of diverging length scale near the dynamic
transition points. The frequency dependences of the transition temperatures of
the multiple dynamic transition are also studied briefly.
