Investigation of slider vibrations due to contact with a smooth disk surface

The dynamic behavior of pico sliders is investigated during slider-disk con tacts as a function of velocity, pitch angle, crown height, and lubricant t hickness using laser Doppler vibrometry and acoustic emission sensors. Anal og and digital filtering methods are applied to distinguish air hearing and slider body resonances from frequencies related to disk runout, load beam design, and gimbal structure. Sliders with high pitch angle and small crown were found to exhibit smaller vibration amplitudes after slider-disk conta cts than sliders with low pitch angle or large crown. The lubricant thickne ss of the disk was found to affect both the glide avalanche height of the d isk and the dynamic behavior of the slider. The results show that roll and pitch frequencies of the air bearing increase with decreasing disk velocity .