Evaluations of Diamond-Like-Carbon Film Optical Constants and Their Effects on Flying Height Determination

[+] Author and Article Information
Yufeng Li, Aric Menon, Peter Goglia

Seagate Technology, Bloomington, MN 55420

J. Tribol 118(4), 767-773 (Oct 01, 1996) (7 pages) doi:10.1115/1.2831606 History: Received August 15, 1995; Revised December 29, 1995; Online January 24, 2008


The accuracy in flying height determination of a film coated magnetic slider relies on the availability of accurate optical property values of each film. In view of this, the index of refraction and coefficient of extinction of carbon and underlayer films, as used on a magnetic slider, was evaluated in this study. Various thicknesses of carbon and underlayer films were coated on Al2 O3 -TiC substrates, and their optical properties were determined by using a variable angle spectroscopic ellipsometer at multiple angles of incidence and two optical models via reasonable range and least square methods. Then the effects of the carbon and underlayer films on flying height measurement were assessed. It was found that the optical properties of the underlayer film are strongly thickness and wavelength dependent. Therefore, the flying height measurement errors caused by incorrect treatment of the films are functions of film thickness and light wavelength.

Copyright © 1996 by The American Society of Mechanical Engineers
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