Read/Write Properties of Nd-RE-TM Films in the Short-Wavelength Region

The effect of adding Nd to an RE-TM film on the disk´s magnetooptic and read/write properties was investigated. It was found that as the amount of Nd was increased, the C/N ratio at a wavelength of 532 nm was improved. In spite of an increase in the Kerr rotation angle, the carrier level was not significantly improved. This fact can be explained by the disk´s magnetooptic characteristics, as a result of which the Kerr ellipticity angle decrease in the short-wavelength region as the Nd content was increased. Thus the value of the figure of merit was not improved. The improvement in C/N ratio was due to a decrease in the noise level.