Title :
Effects of vacuum ultraviolet irradiation to lubricant layer on hard-disk media
Author :
Chiba, H. ; Nakamura, N. ; Takeda, M. ; Watanabe, K.
Author_Institution :
Inorg. Mater. & Polymers Lab., Fujitsu Labs. Ltd., Atsugi, Japan
fDate :
9/1/2002 12:00:00 AM
Abstract :
We investigated the effects of 172-nm irradiation to examine the potential of ultraviolet treatment to bonded lubricant ratio and surface energy. The bonded ratio of lubricant reached almost 100%. The surface shows strong water-repellent properties. For example, the contact angle of water was a maximum of 110°. Surface-free energy was estimated to be 12 mN/m, according to Zisman´s plot. This value is lower than that of poly(tetrafluoroethylene).
Keywords :
contact angle; hard discs; lubrication; surface energy; ultraviolet radiation effects; 172 nm; C; Zisman plot; bonded lubricant ratio; carbon overcoat; contact angle; hard-disk media; head-disk magnetic spacing; lubricant layer; polytetrafluoroethylene; strong water-repellent properties; surface energy; surface-free energy; ultraviolet treatment; vacuum ultraviolet irradiation; Atomic measurements; Bonding; Hard disks; Humidity; Hydrogen; Lamps; Lubricants; Radiation effects; Surface contamination; Surface treatment;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2002.802840
