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    Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
    (2012-12-01)
    Boonsang, Siridech
    ;
    Aroonjarernchay, Wanchai
    In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty. © 2012 IEEE.
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    Uncertainty analysis of polarization interferometric measurements of hard disk drive recording head-media dynamic spacing
    (2012-06-12)
    Boonsang, Siridech
    ;
    Aroonjarernchay, Wanchai
    In this paper the numerical method based on Monte-Carlo techniques is utilized for the analysis of the flying height measurement uncertainty. In the current flying height tester, the prediction of error is the main concern in order to assure the attainable precision. In previous study, a simplified analytical method is normally used and it may not provide the accurate results of the error prediction especially when the amount of the flying height values becoming as low as sub-5 nm. In this paper, instead of using the analytical method for error analysis, the numerical method based on Monte-Carlo techniques is utilized. Our simulation results show that the measurement uncertainty is mainly from the variation in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the optical constants of DLC layer causes the higher measurement uncertainty.
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    An environmental controlled system for the flying height measurement
    (2012-06-12)
    Boonsang, Siridech
    ;
    Niltarach, Wittaya
    ;
    Aroonjarernchay, Wanchai
    This paper presents the environmental controlled system for the flying height measurement. The effect of temperature and humidity to flying height change is seriously needed due to the critically small head-media spacing. The small environmental changes can cause the variation of the head-media spacing. The flying height measurement system is based on the commercial dynamic flying height testing machine. The maximum temperature that the flying height measurement system can be performed is 58 degree Celsius at the relative humidity of 3 %. The slider flying height is linearly reduced with increasing temperature comparable with the measurement and simulation results shown in the literature.