Partial contact at the head/tape interface is investigated as a function of changes in the head/tape spacing due to asperity compression during contact. A model of head/tape contact, based on measurements of average contact pressure versus average head/tape spacing, is developed and incorporated into a numerical simulation of the head/tape interface. Numerical calculations of head/tape spacing with partial contact are verified by interferometric measurements.
Abstracr -In an interferometric system for measurement of spacing between a transparent disk and a slider, the effect of phase shift on reflection off the slider surface must be considered to obtain an accurate measurement. In this paper we describe a theoretical treatment of the problem and provide typical measurements of phase shift on reflection for several types phase shift utilizes an ellipsometric measurement of the slider's complex index of refraction from which the phase shift on reflection is calculated. Monochromatic interferometric theory is used to show that assuming the slider to behave as a dielectric with a phase shift on reflection of 1~ can result in flying height measurement errors on the order of 12 nm. The magnitude of the phase-shift effect is investigated for different slider materials. In addition, the variation in phase shift as a function of the wavelength of light is investigated.
A procedure is described whereby head wear can be numerically simulated. Wear is assumed to be proportional to a materia1 constant times the contact pressure. Based on this assumption, the change in head contour due to wear is calculated in incremental steps starting from any initial contour. Simulation data is compared to an experimental measurement of head contour change due to wear.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.