  We study magnetic domain patterns in ferromagnetic thin films by numerical
simulations for a simple Ising-like model. Magnetic domain patterns after
quench demonstrate various types of patterns depending on the field sweep rate
and parameters of the model. How the domain patterns are formed is shown with
use of the number of domains, the domain area, and domain area distributions as
well as snapshots of domain patterns. Considering the proper time scale of the
system, we propose a criterion for the structure of domain patterns.
