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Accurate measurement of the flying height of a slider taking into account the reflectance variation of the magnetic disk surface.

This paper presents a new optical method for measuring the flying height of a slider on a n actual magnetic disk. The slider used in the measurements was of the taper-flat type and partly made of quartz glass. The surface of the glass was coated with a half-mirror membrane, by which the laser beam applied to this membrane was divided into two beams: one reflecting on the glass surface, and the other transmiting through the glass and reflecting on the magnetic disk surface. The intensities of these two beams and their interfered beams were measured independently, so that the change in reflectance of the disk surface could be taken into account in the measurement of the flying height.