Abstract
As technology improves, the spacing between magnetic disks and magnetic heads continues to be reduced. A typical spacing measurement method is based on interferometry, in which the magnetic disk is usually replaced by a glass disk. Therefore, this method cannot be used to measure the spacing between a real magnetic disk and a ceramic slider. In order to measure this real spacing, we have developed a new spacing sensor based on Frustrated Total Reflection. We fabricated the sensor on a ceramic slider using the magnetic head insulation layer as a waveguide. To evaluate the performance of the new sensor, we used it to measure the spacing between a glass disk and a ceramic slider, using a typical interferometry method. The results agreed with each other within an error of 5 nm. The sensor shows potential for use with a real magnetic slider.
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