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RESEARCH PAPERS

Lubricant Removal, Degradation, and Recovery on Particulate Magnetic Recording Media

[+] Author and Article Information
V. J. Novotny, T. E. Karis, N. W. Johnson

IBM Research Division, Almaden Research Center, San Jose, Calif 95120-6099

J. Tribol 114(1), 61-67 (Jan 01, 1992) (7 pages) doi:10.1115/1.2920869 History: Received November 05, 1990; Revised April 02, 1991; Online June 05, 2008

Abstract

Lubrication of particulate magnetic recording media improves their mechanical durability in sliding and flying by several orders of magnitude compared with unlubricated media. Lubricant removal, degradation, and recovery were studied using microslit scanning Fourier transform infrared spectroscopy and microspot scanning X-ray photoelectron spectroscopy. These techniques measure the total and surface lubricant amounts in the porous film, respectively. Lubricant dynamics were compared for two physisorbed polyperfluoroalkylether lubricants of similar molecular weight but different molecular structure—Y with a CF3 side group and Z with linear chains. The bulk viscosity of Y was about ten times higher than the viscosity of Z. In sliding, the lubricant removal rate of Y was significantly higher than that of Z while in flying the removal rates were reversed. Removal rates in sliding were orders of magnitude higher than those in flying. Effective lateral diffusion coefficients estimated from the rate of lubricant reflow back to the depleted tracks were close to inversely proportional to the bulk viscosity. During sliding and flying both lubricants degraded as evidenced by chemically altered lubricant detected on the surfaces after dissolution of undegraded lubricant.

Copyright © 1992 by The American Society of Mechanical Engineers
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