Design Theory and Vibration Characteristics of Contact Head Slider

Abstract

The design theory of the previously proposed contact head slider was extended by considering the intermolecular adhesion force and thermally protruding head slider. The microwaviness-excited vibration characteristics of the thermally protruding head slider were analyzed by using the JKR adhesive contact theory. An important fact revealed is that, owing to the adhesive force, the excited frequency of the contacting slider are changed from zero to a value higher than the original second mode resonance frequency with an increase in the head penetration depth. This results in the successive appearance of the first and second pitch mode resonances. Because the friction force varies at the same frequency as the slider normal vibration, low frequency vibrations of the slider-suspension system has to be excited in the off-track and down-track directions. It is speculated that the large vibration with the first mode frequency commonly observed at moderate penetration depth is caused by internal resonance when the the resonance frequency of contact slider passes through the first mode frequency. It is suggested that the region of the head penetration depth for perfect contact sliding can be widened by increasing the contact damping and decreasing the microwaviness.

Influence of Withdrawal Speed on Adhesion Force

“…Using these methods, many previous studies reported on the relationship between the adhesion force and the surface roughness or surface energy of the sample [20][21][22][23][24][25][26][27][28][29][30][31]. There are also many other reports focusing on the effect of surface roughness on the adhesion and interaction of two contact bodies using different surface measurements and theoretical methods [32][33][34][35][36][37][38][39]. These reports suggest that the adhesion force between two contact solids is predictable; however, their application to many industrial machines is difficult because these theories and experimental results are based on static measurements.…”