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The roughness measurement of the super-smooth surface of hard disks

Yang, Shuming and Jiang, Xiang (2006) The roughness measurement of the super-smooth surface of hard disks. In: Proceedings of Computing and Engineering Annual Researchers' Conference 2006: CEARC’06. University of Huddersfield, Huddersfield, pp. 1-7.

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Abstract

Technologies for manufacturing hard disks are driven by the demand to increase magnetic storage
capacity. However, the rate of increasing storage capacity is being slowed by the inability to produce ever closer flying heights between the sliders and disk surfaces. One of important requirements for flying height is to control the surface of substrates of hard disks to a super-smooth level to allow the sliders to ‘fly’ faster and more closely to the disk surfaces. Currently, there are no any assessment standards for super-smooth surfaces. In this paper, the authors attempt to build a measurement and characterisation protocol for the evaluation of hard disk surfaces using a white-light optical instrument CCI (Coherence Correlation Interferometer). The key advantage of this instrument is its exceptionally high vertical resolution which is an order of magnitude better than comparable systems. System factors and measurement factors both influence the experimental results with CCI, this paper focuses
on analysing the latter including sampling intervals, the number of measurements, measurement area filter cut-off wavelength etc. Based on the experimental results, an optimised group of parameters for measurement and characterisation are recommended. The authors have successfully measured and compared the surface roughness of six hard disks derived from differing Chemical Mechanical Polishing (CMP) ‘abrasives’. It has been found that: (1) the roughness values of the six hard disks
surfaces have all reached a sub-nanometre level; (2) there is little difference in the influences of different CMP regimes on the topography of the hard disk surfaces.

Item Type: Book Chapter
Uncontrolled Keywords: magnetic storage, hard disk, roughness CCI (Coherence Correlation Interferometer)
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QC Physics
Schools: School of Computing and Engineering
School of Computing and Engineering > Centre for Precision Technologies
School of Computing and Engineering > Computing and Engineering Annual Researchers' Conference (CEARC)
School of Computing and Engineering > Centre for Precision Technologies > Surface Metrology Group
Related URLs:
Depositing User: Graham Stone
Date Deposited: 06 Apr 2009 15:34
Last Modified: 02 Dec 2010 12:29
URI: http://eprints.hud.ac.uk/id/eprint/3812

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