Magneto-optical recording medium and head unit for a magneto-optical recording medium

Abstract

A magneto-optical recording medium having a substrate and magneto-optical recording film. The substrate is formed from a material having light transmittivity. One surface of the substrate is provided with a magneto-optical recording film. When light having a wavelength of .lambda. is irradiated on the surface of the substrate having the magneto-optical recording film, grooves are formed in film which have an optical depth with a lower limit of .lambda./8 and an upper limit of .lambda./4 or less. The magneto-optical recording film is formed so that the Kerr ellipticity thereof becomes 0.degree.. 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 is 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.

Dependencies are inferred from the claim text.