Abstract
Thermo-magnetically reversed domain size in TbCo magneto-optical disks has been numerically analyzed. The recorded domain radii were derived from the calculation of partial differentials of magnetic energies at the domain walls according to Huth's model. Disk samples were prepared and the measured thermo-magnetic properties were used for the calculation. The relative value of the domain wall energy was obtained using the mean field theory, and its absolute value was set so that the calculated and measured threshold recording powers were identical to each other. The recorded domains in the disks were observed with an Ar laser scanning polarization microscope to compare their radii with the calculated ones. This numerical analysis yielded fairly good estimations in the rather high power region, whereas the calculated radii were much smaller than the measured ones near threshold recording power.
