| 摘要 |
A magneto-optical recording medium has a substrate and a magneto-optical recording film. The substrate is formed from material having light transmittivity. On one surface of the substrate there is provided a magneto-optical recording film. In said one surface of the substrate where the magneto-optical recording film is provided, when a wavelength of a light beam, irradiated on the magneto-optical recording medium, is lambda , there are formed grooves having an optical depth where its lower limit is lambda /8 and its upper limit is lambda /4 or less. The magneto-optical recording film is formed so that the Kerr ellipticity thereof becomes 0 DEG . A head unit for the magneto-optical recording medium has an optical-axis device for compensating the Kerr ellipticity of the magneto-optical recording medium, the optical-axis device being disposed in an optical path between an object lens for focusing a light beam emitted from a light source on the magneto-optical recording film and a polarization beam splitter.
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