  We have investigated the time-dependent regime of a two-dimensional
metamagnetic model at its tricritical point via Monte Carlo simulations. First
of all, we obtained the temperature and magnetic field corresponding to the
tricritical point of the model by using a refinement process based on
optimization of the coefficient of determination in the log-log fit of
magnetization decay as function of time. With these estimates in hand, we
obtained the dynamic tricritical exponents $\theta $ and $z$ and the static
tricritical exponents $\nu $ and $\beta $ by using the universal power-law
scaling relations for the staggered magnetization and its moments at early
stage of the dynamic evolution. Our results at tricritical point confirm that
this model belongs to the two-dimensional Blume-Capel model universality class
for both static and dynamic behaviors, and also they corroborate the conjecture
of Janssen and Oerding for the dynamics of tricritical points.
