ISSUES ON HIGH-SPEED LASER ZONE TEXTURING OF MAGNETIC DISK SUBSTRATESWITH IMPROVED QUALITY

Important issues of laser zone texturing in manufacturing are discusse d. We report practical strategies in terms of tooling and process cont rol. We found that good bump height uniformity is achieved-by operatin g in the most stable region where the effects of laser pulse energy fl uctuation, disk thickness variation, and disk runout are minimized. By selecting optimum process parameters, a bump height standard deviatio n of less than 1.5% can be achieved.