Laser-induced deformation on hard disk surface

D. M. Liu, Y. F. Lu, Y. Yuan, W. J. Wang, T. S. Low, T. S. Wee, K. T. Chang, J. K. Goh

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Laser-induced deformation on hard disk surface has been studied. A diode-pumped Q-switched Nd: YVO 4 laser was used in the experiment. The sample is a commercial hard disk. Atomic force microscope (AFM) was employed to analyze the surface morphology after laser irradiation. Depending on the laser fluence used, a radial structure with or without a circular protruding center could be obtained. Auger electron spectroscopy (AES) analyses on different sputtered level were performed to analyze the compositions at irradiated and unirradiated areas. The mechanisms of surface deformation are proposed qualitatively based on the results. Since the upper three layers, the carbon, magnetic and chromium layers, are quite thin and have higher melting points than that of the underlying nickel-phosphorous layer, the radial structure is possibly due to the interfacial stress developed during the localized sub-surface melting of the nickel-phosphorous layer. The circular protruding center is probably resulted by the whole surface melting due to higher local laser fluence.

Original languageEnglish (US)
Pages (from-to)482-488
Number of pages7
JournalApplied Surface Science
Volume138-139
Issue number1-4
DOIs
StatePublished - Jan 1999
Externally publishedYes

Keywords

  • Auger electron spectroscopy
  • Hard disk
  • Q-switched Nd:YVO laser

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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