  Dynamic phase transition phenomena in ultrathin films described by
Blume-Capel model have been investigated using Monte Carlo simulations.
Hysteresis loops, micromagnetic structures, and hysteresis loop area curves, as
well as dynamic correlation between the magnetization and the external field
have been studied as functions of the field, as well as the film parameters.
The variation of critical coupling of the modified film surface at which the
transition temperature becomes independent of film thickness have been
clarified for varying system parameters. Frequency dispersion of hysteresis
loop area have been found to obey a power law for low and moderate frequencies
for both ordinary and enhanced surfaces.
