Thermal and Electron-Stimulated Chemistry of Fomblin-Zdol Lubricant on a Magnetic Disk

Jong-Liang Lin, C. S. Bhatia, John T. Yates

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The thermal and electron-induced decomposition of Fomblin-Zdol lubricant on a rigid magnetic disk with a hard carbon overcoat are studied by temperature-programmed reaction/desorption spectroscopy and electron stimulated desorption. The thermal spectroscopy shows two desorption features peaked at 640 and 700 K resulting from decomposition of the Fomblin-Zdol molecules. The threshold temperature for dissociation of the Fomblin-Zdol molecule is at 500–550 K in accordance with the known thermal stability of the free molecule. HF originating from thermal reactions with either surface OH or surface CH groups is a prominent desorption product. Electron impact also causes Fomblin-Zdol dissociation. Two efficient mechanisms for electron impact dissociation have been resolved separately above and below the ionization threshold of ~ 14 eV. The low-energy process is likely due to the formation of negative ions followed by dissociation (dissociative electron attachment) and has a cross section of ~2X 10–16cm. These results show that Fomblin-Zdol as a lubricant on a magnetic disk is inherently unstable thermally and in the presence of triboelectrons.

Original languageEnglish
Pages (from-to)163-168
Number of pages6
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume13
Issue number2
DOIs
Publication statusPublished - 1995 Jan 1

Fingerprint

magnetic disks
electron attachment
lubricants
Lubricants
desorption
chemistry
Electrons
electron impact
Desorption
electrons
decomposition
molecules
thresholds
negative ions
spectroscopy
Molecules
thermal stability
Spectroscopy
methylidyne
Decomposition

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

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abstract = "The thermal and electron-induced decomposition of Fomblin-Zdol lubricant on a rigid magnetic disk with a hard carbon overcoat are studied by temperature-programmed reaction/desorption spectroscopy and electron stimulated desorption. The thermal spectroscopy shows two desorption features peaked at 640 and 700 K resulting from decomposition of the Fomblin-Zdol molecules. The threshold temperature for dissociation of the Fomblin-Zdol molecule is at 500–550 K in accordance with the known thermal stability of the free molecule. HF originating from thermal reactions with either surface OH or surface CH groups is a prominent desorption product. Electron impact also causes Fomblin-Zdol dissociation. Two efficient mechanisms for electron impact dissociation have been resolved separately above and below the ionization threshold of ~ 14 eV. The low-energy process is likely due to the formation of negative ions followed by dissociation (dissociative electron attachment) and has a cross section of ~2X 10–16cm. These results show that Fomblin-Zdol as a lubricant on a magnetic disk is inherently unstable thermally and in the presence of triboelectrons.",
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Thermal and Electron-Stimulated Chemistry of Fomblin-Zdol Lubricant on a Magnetic Disk. / Lin, Jong-Liang; Bhatia, C. S.; Yates, John T.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 13, No. 2, 01.01.1995, p. 163-168.

Research output: Contribution to journalArticle

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