Lubricant replenishment on carbon coated discs

Author

Ma, X. ; Gui, J. ; Marchon, B. ; Jhon, M.S. ; Bauer, C.L. ; Rauch, G.C.

Author_Institution

Seagate Recording Media, Fremont, CA, USA

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

2454

Lastpage

2456

Abstract

The replenishment of a lubricant on a carbon coated disc was characterized through theoretical modeling employing experimentally acquired diffusion coefficient data. To quantify the reflow behaviour of a lubricant film, a parameter, the critical reflow time, was defined as the time to replenish a depleted hole of 1 μm diameter in a 2 nm thick lubricant film. The results based on solving 2D diffusion equations showed that the critical reflow time is a strong function of the endgroup polarity and molecular weight of a lubricant, as well as the H and N content in the carbon film. Based on these results, design criteria have been provided for enhanced wear durability of magnetic media

Keywords

carbon; diffusion; hard discs; lubrication; reliability; wear resistant coatings; 1 micron; 2 nm; 2D diffusion equations; C; coated discs; critical reflow time; depleted hole; design criteria; diffusion coefficient data; endgroup polarity; lubricant replenishment; molecular weight; reflow behaviour; wear durability; Amorphous magnetic materials; Amorphous materials; Disk recording; Equations; Lubricants; Magnetic films; Magnetic recording; Robustness; Semiconductor device modeling; Surface resistance;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800856

Filename

800856