THE EVALUATION OF DOMAIN STABILITY FOR HIGH DENSITY RECORDING ON MAGNETO-OPTICAL DISK

The stability of small recorded domain were investigated by the wall pinning force (Hw) which were calculated from the measurement result of wall expanding and shrinking coercive forces (He, Hs). He and Hs decrease with decreasing recorded domain diameter. Therefore Hw also decrease with decreasing recorded domain size. This result indicates that the writing stability of small domain ( < 0.4μmφ ) becomes low. The stability for recording 0.25μm domain on a RE-rich TbFeCo disk is higher than that of TM-rich one. It is found that the reason is originated from the large value of the Hw for the RE-rich TbFeCo at around recording temperature comparing for the TM-rich one by using the Huth model.