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Chemical Fluorination of Carbon Overcoated Thin-Film Magnetic Storage Media in a Fluorinating Solution

IP.com Disclosure Number: IPCOM000116968D
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 41K

Publishing Venue

IBM

Related People

Baum, TH: AUTHOR [+2]

Abstract

Thin-film magnetic storage media typically utilize a hard carbon overcoat to enhance wear durability and to decrease corrosion of the magnetic media. The overcoat is usually lubricated with a fluorinated polyether lubricant or other suitable polymer. The lubricating polymer provides improved tribological properties and lubricity during head/disk operation in the file.

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Chemical Fluorination of Carbon Overcoated Thin-Film Magnetic Storage
Media in a Fluorinating Solution

      Thin-film magnetic storage media typically utilize a hard
carbon overcoat to enhance wear durability and to decrease corrosion
of the magnetic media.  The overcoat is usually lubricated with a
fluorinated polyether lubricant or other suitable polymer.  The
lubricating polymer provides improved tribological properties and
lubricity during head/disk operation in the file.

      The use of thin polymeric liquid lubricants can result in
elevated stiction values during operation.  A fluorinated solid film,
on the other hand, displays a lower surface energy, lower coefficient
of friction and may behave as a lubricating layer.  One method to
produce a fluorinated layer is via solution chemical fluorination of
the sputtered carbon overcoat.  For example, immersion of a thin-film
magnetic disk into a fluorinating reagent results in the surface
fluorination of the carbon layer.  The degree of fluorination may
depend upon the level of hydrogen in the sputtered carbon film, the
chemical structure of the carbon, the fluorinating reagent utilized
and the time of immersion or fluorination.

      A thin-film disk was placed into a concentrated solution of
tris triethylamine hydrofluoride which is a useful fluorinating
reagent for unsaturated organic molecules.  This material was
successfully utilized to fluorinate the carbon overcoat layer.  X-ray
photoelectron...