Effect of lubricant characteristics on particle adhesion and removal in a magnetic hard disk surface

Hee Sung Park, Sung Hoon Choa, Jungho Hwang

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Abstract

Particle contamination has been a big concern in the disk drive industry. In this study, spin-off tests were carried out to investigate the adhesion and removal tendencies of a particle on the disk surface. Numerical simulation was performed to investigate the dominant parameters of particle detachment and to compare with experimental results. It was found that particles are detached from the disk surface by the moments of the centrifugal and drag forces. The centrifugal and capillary forces were found to be dominant forces that determine spin-off ratio of a particle from the disk surface. Removal of fine particles smaller than several micrometers, which are the main sources of thermal asperity (TA), is extremely difficult because the adhesion force exceeds the centrifugal force. For particles smaller than 2.5 μm, the adhesion force dominates, and the particle removal by centrifugal or air shear forces does not take place. Lubricant types and manufacturing processes also influence particle removal. In this study, the work performed by Li and Sharma (2000) is extended to include the effects of lubricant characteristics on particle adhesion, such as surface tension and viscosity. Lower surface tension and viscosity of lubricant will help to increase the removal rate of particles from the disk surface.

Original languageEnglish
Pages (from-to)213-220
Number of pages8
JournalJournal of Information Storage and Processing Systems
Volume3
Issue number3-4
Publication statusPublished - 2001 Jul 1

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

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