Abstract
Thermal stability of magnetic domain size in magneto-optical recording media TbFeCo is discussed. Shrinkage in domain size under accelerated conditions using irradiating laser light is found more significant for rare earth (RE) rich disk than transition metal (TM) rich disk. The reason for this difference is because the coercivity Hc of the RE-rich type is higher than the TM-rich type at the time of laser irradiation, which is effective against a wall field for minimizing domain size shrinkage.
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