MANUFACTURING METHOD FOR PERPENDICULAR MAGNETIC RECORDING MEDIUM
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United States of America Patent
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Issued Date -
Jun 12, 2008
app pub date -
Jun 15, 2007
filing date -
Dec 6, 2006
priority date (Note) -
Abandoned
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Abstract
A manufacturing method for a magnetic recording medium is disclosed. By using the method, the anisotropic magnetic field (Hk) of an underlayer is improved, spike noise generated in the soft magnetic underlayer is suppressed, and the signal-to-noise ratio (SNR) is improved without employing a special layer configuration and without the need for complicated and expensive processing. A soft magnetic underlayer is formed by laminating a soft magnetic lower underlayer, a non-magnetic metal layer, and a soft magnetic upper underlayer in succession on a non-magnetic substrate. After forming the non-magnetic metal layer, its surface is exposed to a gas containing between 2 and 100 at % oxygen. A perpendicular magnetic recording layer is formed on the soft magnetic underlayer.
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