Abstract
An ordinary structured magneto-optical disk was improved and optimized to achieve high areal recording density using the magnetic field modulation recording technique. After studying film material/thickness, groove geometry, and birefringence in a poly-carbonate substrate, a track pitch of 0.85 µm with a linear recording density of 0.31 µm/bit is determined to be a good combination for a wavelength of 690 nm and an objective lens with a numerical aperture of 0.55, which results in an areal density of 3.8 bit/µm2 or 2.4 Gbit/inch2.
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