CoCrNiTa/Cr magnetic recording medium
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United States of America Patent
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Mar 7, 2000
Grant Date -
N/A
app pub date -
Nov 5, 1997
filing date -
Nov 5, 1997
priority date (Note) -
Expired
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Abstract
A magnetic recording medium for use in making high-density computer hard disks. It contains: (a) an aluminum or Ni/P substrate; (b) a chromium underlayer on the substrate; (c) a four-component magnetic recording layer on the underlayer; and (d) a carbon protective layer on the magnetic recording layer. The magnetic recording layer comprises 66-78 atom percent of cobalt, 12-16 atom percent of chromium, 6-10 atom percent of nickel, and 4-8 atom percent of tantalum. The CoCrTiTa four-component exhibits a high coercivity (greater than 2,800 Oe), which results in many improved qualities, including increased recording density, reduced noise, improved off-track capability (OTC), and reduced on-track error rate (OTER). It also also allows the sputtering process to be conducted at a substantially lowered temperature.
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