Experimental comparison of load/unload slider dynamics for two different pico-slider designs

A comparison of Laser-Doppler vibrometry (LDV) and acoustic emission (AE) d ata is presented for two different slider designs during load/unload (L/UL) . The behavior of the slider is measured for three different vertical load/ unload velocities using a transparent glass disk with the slider flying at the bottom surface of the disk. The LDV laser spot can be positioned on the slider airbearing surface during the complete load/unload process with the help of a so-called "periscope." A characteristic velocity peak during unl oading is observed that is caused by the slider pull-off force.