SPM用マイクロプローブを用いた磁気ディスク表面凝着力の速度依存性の計測

概要

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A novel method for measuring the velocity-dependent adhesion force exerting on the magnetic disk has been developed using a micro-probe for Scanning Probe Microscope(SPM). The deformation of the cantilever having a diamond tip was measured based on the Michelson laser interferometry wherein an interference fringe pattern was formed over the cantilever. The fringe images were captured by an ultra high speed CCD camera, and then the deformation of the cantilever was accurately obtained through the image processing for extracting ridgelines. The high speed camera enabled one to observe the fringe image variation while the tip was being separated from a target surface accompanied by transient vibration. To circumvent the difficulties in identifying the separation point, the position and the deflection of the cantilever just at the separation were obtained as the initial values of the transient response, which was identified by means of the least squares method. Finally, the present method was applied to the measurements of the separation force exerting on the glass disk having a moleculary thin lubricant film. As a result, the separation force was found to be approximately in proportion to the square root of the retractive velocity.
一般社団法人日本機械学会の論文
2000-02-25