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

Abstract

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