  The decay of the hysteresis loop area of the system, which is obeying a site
diluted kinetic Ising model, is considered by the disorder parameter using the
effective field theory analysis. The exhibition focuses on the understanding of
external field frequency, amplitude and the site concentration dependency of
the hysteresis loop area for several powerful treatments. Important
characteristics of the hysteretic response, such as frequency dispersion,
effect of domain nucleation phenomenon on the dynamic process etc. has been
introduced together with well known other characteristics. An attempt has been
made to explain the relations between the competing time scales (intrinsic
microscopic relaxation time of the system and the time period of the external
oscillatory field) and the shape of the response. As a result of the detailed
investigations, existence of essentially three, particularly four types of
dispersion curves have been propounded.
