NDLI: Experimental Comparisons of Spreading and Replenishment Flows of Molecularly Thin Lubricant Films Coated on Magnetic Disks

Content Provider	IEEE Xplore Digital Library
Author	Mitsuya, Y. Zhang, H. Ohgi, J. Fukuzawa, K.
Copyright Year	1965
Abstract	To ensure the reliability and durability of the head-disk interface of magnetic disk drives, the lubricant film flow coated on the disk surface has become a significant concern because it is related to recovery performance when the film is damaged. In this study, the replenishment characteristics of perfluoropolyether (PFPE) polar lubricant films after lubricant depletion induced by a glass ball sliding on the disk were clarified by measuring the profile changes of the lubricant film. Lightly loaded and slowly rotated test conditions were selected to avoid strongly disturbing the molecular layering structure. We found that the replenishment process dramatically changed with increasing film thickness, and recoverable and unrecoverable features appeared depending on the coated and residual film thicknesses. The replenishment process was compared with the step-boundary flow, i.e., the flow from the step-shaped lubricant boundary and the disjoining pressure distributions. The diffusion coefficients calculated from the step-boundary flow were found to be ineffective for replenishment flow, and the disjoining pressure differences between the coated and residual film thicknesses bifurcate the replenishment flow into recoverable and unrecoverable features.
Sponsorship	IEEE Magnetics Society
Starting Page	3641
Ending Page	3644
Page Count	4
File Size	400754
File Format	PDF
ISSN	00189464
Volume Number	44
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-11-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lubricants Magnetic films Magnetic levitation Glass Testing Diamond-like carbon Springs Rough surfaces Surface roughness Rail transportation polar lubricant Disjoining pressure lubrication magnetic disk recording perfluoropolyether (PFPE)
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Fundamental Study of Vapor Lubrication by PFPE Lubricants in Hard Disk Drives

Conformation of ultra-thin PFPE lubricant with different structure on magnetic disks - direct observation and MD simulation -

Behavior of molecularly thin lubricant films for contact sliders in hard disk drives

Advanced head disk interface system assisted by gas PFPE lubrication

Spreading Properties of Monolayer Lubricant Films: Effect of Bonded Molecules

Atomistic and Molecular Effects on the Surface Morphology and Film Conformation of Perfluoropolyether Lubricant Layer

Solvent Effects on Friction Properties of Monolayer Perfluoropolyether Films Coated on Magnetic Disk Surfaces

Effects of End Groups on the Spreading Characteristics of Molecularly Thin Liquid Lubricant Films in Hard Disk Drives

Conformation of Ultrathin PFPE Lubricants With Different Structure on Magnetic Disks—Direct Observation and MD Simulation

Experimental Comparisons of Spreading and Replenishment Flows of Molecularly Thin Lubricant Films Coated on Magnetic Disks

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