CoCrNiTa/Cr magnetic recording medium

Details CoCrNiTa/Cr magnetic recording medium CoCrNiTa/Cr magnetic recording medium

1997-11-05

2000-03-07

Kiliman, Leszek

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428336, 428694T, 428694TS, 428900, 427128, 427129, 427130, 2041922, G11B 566

Patent

active

060337729

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.

REFERENCES:
patent: 4677032 (1987-06-01), Robinson
patent: 5004652 (1991-04-01), Lol
patent: 5049451 (1991-09-01), Lol
patent: 5057200 (1991-10-01), Lol

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