Glass substrate for a magnetic disk, a magnetic disk which can be formed with a stable texture and a magnetic disk device
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United States of America Patent
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Apr 25, 2006
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N/A
app pub date -
Aug 12, 2004
filing date -
Jul 24, 1997
priority date (Note) -
Expired
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Abstract
A glass substrate for a magnetic disk contains a transition metal. The substrate, which is subjected to formation of zone texturing by irradiating the substrate with a laser beam, has a high mechanical strength even if it is not chemically strengthened. The glass substrate contains a transition metal element and has a transmittance of 10% of less for light in a wavelength range of 300 to 2000 nm. The surface roughness of an information recording surface portion thereof is 2.0 nm or less. In addition to a transition metal element, the glass substrate may include a rare earth metal element.
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