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Abstract
In this paper, laser Doppler vibrometry is used to study the motion of a femto slider in the vertical, pitch, roll, off-track and down-track direction due to slider–lubricant interactions. The change in slider dynamics is determined by comparing the laser Doppler vibrometer signals from the slider for time increments of 2 min. The time evolution of this signal is analyzed. The data suggest that slider–lubricant interactions at the head-disk interface have a strong effect on slider dynamics. Spectral analysis of the slider motion indicates that excitation occurs at the same frequency for all degrees of freedom. The excitation frequency is slightly lower than the free vibration frequency, suggesting that lubricant damping plays a role in the excitation of the slider.
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