Title :
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
fDate :
Nov. 29 2006-Dec. 1 2006
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;
Conference_Titel :
Asia-Pacific Magnetic Recording Conference, 2006
Conference_Location :
Singapore
Print_ISBN :
1-4244-0863-6
DOI :
10.1109/APMRC.2006.365898
