  A simulation study for the magnetization process is performed for the
multi-domain state in a chiral p-wave superconductor, using the time-dependent
Ginzburg-Landau theory. The external field penetrates inside as core-less
vortices through the domain wall, forming the vortex sheet structure. We find
that, with increasing magnetic fields, the domain walls move so that the
unstable domains shrink to vanish. Therefore, the single domain structure is
realized at higher fields.
