Uncertainty Analysis of Polarization Interferometric Measurements of Hard-Disk Drive Recording Head-Media Dynamic Spacing

Siridech Boonsang and Wanchai Aroonjarernchay


Interferometry, Head-Media Spacing, Dynamic Flying Height


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 varia-tion in the optical constants of the DLC layer. They also show that the increasing of standard deviation of the op-tical constants of DLC layer causes the higher measure-ment uncertainty.

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