THE ROLE OF WALL COERCIVITY AND ENERGY ON THE READ-OUT STABILITY OF GDTB-FE BASED MAGNETOOPTICAL DISKS

The read-out stability of thermomagnetically written domains in GdTb-Fe disks has been measured by recording experiments as a function of read laser power and the applied magnetic field. The domain stability increases significantly and the field dependence becomes much flatter with increasing Tb content. At low Tb content compensation temperatures below room temperature result in a strong reduction of domain stability at higher applied magnetic fields. The results of a bubble-like model using the measured magnetic and thermal properties of the disks explain and predict the recording data with high precision. © 1990 IEEE