A SCANNING METHOD TO STUDY THE INFLUENCE OF ROUGHNESS, MICROWAVINESS, AND LUBRICANT THICKNESS VARIATION ON SLIDER DYNAMICS

摘要

Flying height modulation maps and microwaviness maps are obtained by using laser Doppler vibrometry (LDV) and acoustic emission (AE) transducers which are moved radially over the complete disk surface. The sensitivity of the acoustic emission measurement is improved by applying a current to the write element, thereby increasing pole tip protrusion. Disk and slider displacement maps are obtained using a radially scratched disk. Acoustic emission maps are presented for a scratched disk and for a non-scratched disk. For the non-scratched disk, AE maps are obtained with an inactive and active write element.