| 摘要 |
PURPOSE:To obtain a magneto-optical recording medium having a satisfactory reproduction S/N by providing a chalcogenite film on a substrate as an optical guide. CONSTITUTION:A chalcogenite film 9 and a magneto-optical magnetic film 10 are laminated on a substrate 8, the refractive index N1 of the film 9 shows N1+ to the right-turn circular polarized light and N1- to the left-turn circular polarized light respectively. In the same way, the refractive index N2 of the film 10 has two types of indexes N2+, N2-. The area of refractive indexes (N1+, N1-) and the area of (N'1+, N'1-) are arranged alternately on the same plane containing a large difference between the reflection factor R and the Kerr rotational angle thetak. Thus either one of these two areas can be used as an optical guide. In other words, the optical guide is set at the area of (N1+, N1-), for example, for follow-up of tracks. As a result, the stable recording/ reproducing and erasing jobs are ensured with no increase of reproduction noises produced by follow-up of tracks with use of a geometrical groove.
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