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The higher laser repetition rate and shorter wavelength laser required for small diameter laser texture designs tend to tilt and deform crater bumps during formation. The relationship between bump distortion and the texturing parameters is studied using a green CW laser system. A stiction model is developed using elliptical contact analysis to predict the effects of bump tilting on tribological performance. The optimization of laser texture designs for 2.5 um diameter bumps is discussed using model prediction. Experiments are carried out to verify the simulation results. Reasonable agreement between calculated and experimental data suggest that a smaller bump diameter design with proper tilting and bump density provides improved stiction performance.Index Terms -Laser texture, green laser, head-media interface, tribology.

Laser zone texture technology is widely used to enhance the tribological performance of high areal density media. A review of laser texture design approaches with stiction modeling and contact stress analysis is presented. Criteria developed for optimizing sombrero and crater bump designs for NiP/Al substrates and spherical bump designs for glass and glass-ceramic substrates are introduced. Manufac-turability issues in maintaining bump height control for both NiP/Al and alternative substrates are presented. The extendibility of laser texture technology to meet the requirements of magnetic designs in excess of 10 Gb/in 2 is discussed.Index Terms-Laser texture, head-media interface, tribology.

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A model has been established to describe the relationship between laser texture bump height and the offset from the focal plane. Experiments have been carried out to quantify model parameters. A smaller bump diameter design provides improved stiction performance using an optimized bump spacing arrangement. However, smaller bump diameter corresponds to smaller depth of focus. Since the bump height is highest when the disk surface is at the focal plane and since substrate surfaces normally have a runout of about 15 to 40pm, the minimum bump height in a batch of disks will decrease with lower bump diameter or larger defocus offset distance. Using the bump height defocus model combined with our stiction model, we found that a bump diameter less than a critical value will adversely affect the stiction performance.