Effects of end groups on the spreading characteristics of molecularly thin liquid lubricant films in hard disk drives

Author

Tagawa, N. ; Korenaga, M. ; Mori, A. ; Kobayashi, N. ; Ikegami, M.

Author_Institution

High Technol. Res. Center, Kansai Univ., Osaka

fYear

2006

fDate

Nov. 29 2006-Dec. 1 2006

Firstpage

1

Lastpage

2

Abstract

Spreading characteristics of novel alkanoleamine-terminated perfluoropolyether (PFPE) films on carbon surfaces were investigated experimentally by using a scanning micro-ellipsometer. It was found that the mobility of the alkanoleamine-terminated PFPE films was lower than that of conventional lubricants that have the same number of OH end groups as that of the alkanoleamine-terminated lubricants. The mobility of ZDPA with a dipropylamine end group (no OH end group) has peculiar characteristics. In other words, its mobility is higher than that of Zdol when the lubricant film thickness exceeds one monolayer. However, it is lower than Zdol when the lubricant film thickness is less than one monolayer. This may be due to unique interaction between the ZDPA amine group and the carbon overcoat

Keywords

carbon; disc drives; hard discs; liquid films; lubricants; oxygen compounds; thin films; wetting; OH end groups; PFPE films; ZDPA amine group; alkanoleamine-terminated perfluoropolyether; carbon surface; dipropylamine end group; hard disk drives; molecularly thin liquid lubricant films; scanning micro-ellipsometer; spreading characteristics; Chemical technology; Displays; Hard disks; Lubricants; Mechanical systems; Nanotechnology; Spine; Systems engineering and theory; Testing; Thickness measurement; alkanoleamine-terminated perfluoropolyether films; head-disk interface; scanning micro-ellipsometry; spreading characteristics;

fLanguage

English

Publisher

ieee

Conference_Titel

Asia-Pacific Magnetic Recording Conference, 2006

Conference_Location

Singapore

Print_ISBN

1-4244-0863-6

Type

conf

DOI

10.1109/APMRC.2006.365898

Filename

4215283