Abstract
We experimentally and analytically investigated bouncing vibrations of a flying head slider in near-contact regime. In the experiment, we examined the effect of pitch angle on the unstable vibration with hysteresis between touch-down and take-off process by changing the ambient pressure. The pitch angle of the slider was changed by Z-height. As a result, we found that the hysteresis of touch-down and take-off pressure become small as the pitch angle increase even though the trailing spacing decreases slightly. Next, we measured the slider dynamics at the threshold of the bouncing vibration, and found that there are two cases in the start of unstable bouncing vibration of the slider depending on ZH. Moreover, we measured the 3-dimensional slider motion by using two laser Doppler vibrometers simultaneously, and found that the bouncing vibration is a coupled vibration between translation and pitch with a small phase shift. In the analysis, we used a two-degrees-of-freedom slider model considering attractive force and shearing force of the lubricant. The analytical results agree well with the experimental ones.
