Magnetic recording media having CrTiX underlayers to reduce circumferential/radial anisotropy and methods for their production
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United States of America Patent
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Apr 17, 2001
Grant Date -
N/A
app pub date -
Jan 8, 1997
filing date -
Feb 26, 1996
priority date (Note) -
Expired
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Abstract
The present invention provides magnetic recording media comprising a rigid substrate and an underlayer disposed over the substrate, in which the underlayer comprises CrTiCu or CrTiV. A magnetic layer is disposed over this underlayer, and is also disposed over a texturized surface. Generally, the substrate comprises aluminum, and an NiP layer is disposed over the substrate and below the underlayer. The texture will typically be imposed on this NiP layer. Advantageously, the CrTiCu or CrTiV underlayer has been found to compensate for texture-induced anisotropy, limiting a ratio of circumferential coercivity to radial coercivity within the range between about 0.8 and 1.25.
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