Perpendicular Magnetic Recording Medium Using Soft Magnetic Layer Which Suppresses Noise Generation, And Perpendicular Magnetic Recording Apparatus Therewith
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United States of America Patent
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Issued Date -
Sep 20, 2007
app pub date -
Mar 24, 2005
filing date -
Mar 26, 2004
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Abandoned
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Abstract
The magnetic recording medium of the present invention has a substrate, a perpendicular magnetic recording layer, and a soft magnetic layer formed therebetween, having a thickness of less than 100 nm, the soft magnetic layer having a magnetic anisotropy in a surface direction, and product BsHc, which is a production of a saturation magnetic flux density Bs and a coercive force Hc, of not less than 79 TA/m (10 kGOe). By making the thickness of the soft magnetic layer into the above-mentioned range, the magnetic anisotropy in surface direction can be stabilized. magnetostatic energy can be increased sufficiently by making the BsHc the above-mentioned range. Therefore, generating of the magnetic wall in the soft magnetic layer can be suppressed, the noise generating from the soft magnetic layer can be suppressed, and a high-density recording is enabled.
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