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ESCA-Thickness Metrology and Head-Medium Spacing Impact of Disk Lubricant.

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Title: ESCA-Thickness Metrology and Head-Medium Spacing Impact of Disk Lubricant.
Authors: Tang, Huan1, Ma, Xiaoding1, Barth, Gunter1, Liu, Jianwei1, Stirniman, Michael1, Gui, Jing1
Source: IEEE Transactions on Magnetics. Feb2005, Vol. 41 Issue 2, p621-625. 5p.
Subjects: Electron spectroscopy, Gage calibration, Measurement, Thickness measurement, Physical measurements, Standardization, Calibration, Electron emission, Spectrum analysis
Abstract: Electron spectroscopy for chemical analysis (ESCA) has been commonly used as a metrology tool for lubricant film-thickness measurement on magnetic hard disks. The ace curacy of the ESCA-thickness measurement rests solely with the calibration accuracy of the characteristic photoelectron ate tenuation length in the lubricant film. Several past studies on this subject yielded widely divergent results, due to the difficulty in obtaining an accurate, absolute lubricant film-thickness measurement. In this paper, we revisited the calibration issue and, instead of following the same paths pursued in the past, used a derivative method to yield an accurate calibration of the photoelectron attenuation length. We also compared the various methods for lubricant film-thickness calculation based on ESCA measurements and determined that the most accurate method is to use only the photoemission signal from the lubricant film. In addition, by studying the lubricant flame thickness effect on the electrical readback signal, we found that the lubricant film leads to an increase in the head-medium spacing by an amount greater than one times, but less than two times, its physical thickness. [ABSTRACT FROM AUTHOR]
Copyright of IEEE Transactions on Magnetics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 16213620
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PubTypeId: academicJournal
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  Data: ESCA-Thickness Metrology and Head-Medium Spacing Impact of Disk Lubricant.
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  Data: <searchLink fieldCode="AR" term="%22Tang%2C+Huan%22">Tang, Huan</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Ma%2C+Xiaoding%22">Ma, Xiaoding</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Barth%2C+Gunter%22">Barth, Gunter</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Liu%2C+Jianwei%22">Liu, Jianwei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Stirniman%2C+Michael%22">Stirniman, Michael</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Gui%2C+Jing%22">Gui, Jing</searchLink><relatesTo>1</relatesTo>
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  Data: <searchLink fieldCode="DE" term="%22Electron+spectroscopy%22">Electron spectroscopy</searchLink><br /><searchLink fieldCode="DE" term="%22Gage+calibration%22">Gage calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Measurement%22">Measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Thickness+measurement%22">Thickness measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Physical+measurements%22">Physical measurements</searchLink><br /><searchLink fieldCode="DE" term="%22Standardization%22">Standardization</searchLink><br /><searchLink fieldCode="DE" term="%22Calibration%22">Calibration</searchLink><br /><searchLink fieldCode="DE" term="%22Electron+emission%22">Electron emission</searchLink><br /><searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink>
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  Data: Electron spectroscopy for chemical analysis (ESCA) has been commonly used as a metrology tool for lubricant film-thickness measurement on magnetic hard disks. The ace curacy of the ESCA-thickness measurement rests solely with the calibration accuracy of the characteristic photoelectron ate tenuation length in the lubricant film. Several past studies on this subject yielded widely divergent results, due to the difficulty in obtaining an accurate, absolute lubricant film-thickness measurement. In this paper, we revisited the calibration issue and, instead of following the same paths pursued in the past, used a derivative method to yield an accurate calibration of the photoelectron attenuation length. We also compared the various methods for lubricant film-thickness calculation based on ESCA measurements and determined that the most accurate method is to use only the photoemission signal from the lubricant film. In addition, by studying the lubricant flame thickness effect on the electrical readback signal, we found that the lubricant film leads to an increase in the head-medium spacing by an amount greater than one times, but less than two times, its physical thickness. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of IEEE Transactions on Magnetics is the property of IEEE and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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        Value: 10.1109/TMAG.2004.838061
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      – Code: eng
        Text: English
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      – SubjectFull: Electron spectroscopy
        Type: general
      – SubjectFull: Gage calibration
        Type: general
      – SubjectFull: Measurement
        Type: general
      – SubjectFull: Thickness measurement
        Type: general
      – SubjectFull: Physical measurements
        Type: general
      – SubjectFull: Standardization
        Type: general
      – SubjectFull: Calibration
        Type: general
      – SubjectFull: Electron emission
        Type: general
      – SubjectFull: Spectrum analysis
        Type: general
    Titles:
      – TitleFull: ESCA-Thickness Metrology and Head-Medium Spacing Impact of Disk Lubricant.
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            NameFull: Tang, Huan
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            NameFull: Ma, Xiaoding
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            NameFull: Barth, Gunter
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            NameFull: Liu, Jianwei
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            NameFull: Stirniman, Michael
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              Text: Feb2005
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              Y: 2005
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