Title :
Pass wear resistance for perpendicular recording media
Author :
Tagami, K. ; Tamai, H. ; Hayashida, H. ; Arai, T.
Author_Institution :
NEC Corp., Kawasaki, Japan
fDate :
11/1/1988 12:00:00 AM
Abstract :
Pass wear resistance of sputtered CoCr perpendicular flexible disks has been investigated. The disk was composed of CoCr film on a heat-resistant base film, a protection layer, and lubricant. The pass wear durabilities were evaluated for a conventional double-sided 3.5-in drive. It was found that the scratch depth (SD) per load force (LF) depends on preparation conditions, and that the CoCr film hardness is related to pass wear durability. SD/LF values range from 0.2 to 0.3 for CoCr films without a protective layer. With a protective layer and lubricant, the range of SD/LF values varies from 0.2-0.3 to 0.1-0.3. The disk hardness, especially for small SD/LF media, has been improved. A pass wear durability of 30 million passes was attained for a disk having SD/LF=0.1
Keywords :
chromium alloys; cobalt alloys; floppy discs; hardness; sputtered coatings; wear; Co-Cr alloy; double-sided 3.5-in drive; film hardness; flexible disks; heat-resistant base film; lubricant; pass wear durability; pass wear-resistance; perpendicular recording media; preparation conditions; protection layer; scratch depth; sputtered CoCr; Disk drives; Lubricants; Magnetic heads; Mechanical factors; Needles; Perpendicular magnetic recording; Protection; Sputtering; Surface resistance; Testing;
Journal_Title :
Magnetics, IEEE Transactions on
