PFPE潤滑膜によって形成される分子液架橋の動剛性と減衰の測定(S62-4 HDI(2),S62 情報機器コンピュータメカニクス)

概要

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The spring constants and damping coefficients of molecularly thin liquid bridges of PFPE lubricant forming between a diamond tip and DLC surface of a magnetic disk are estimated by means of regression analysis of tip damping vibration. Two PFPE lubricants having functional end groups (Zdol2000 and Zdol4000) with respective thicknesses of roughly 20 nm and 40 nm, were coated on a DLC disk surface in order to form a liquid bridge between the disc and the probe tip. The spring constant of the liquid bridge had negative values varying from -0.15 to -0.1 N/m. Damping values, expressed in the form of frequency-multiplied damping coefficients ranged from 0.02 to 0.06 N/m. It is interesting to note that both and decreased with bridge elongation, and after reaching the minimum, those values began to increase.
2004-09-04