Development of nano-meter head-disk interface for the Tb/in^2 class ultrahigh-recording-density information storage systems

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In order to achieve more than 1Tb/in2 area recording density, it is necessary to develop nano-meter head disk interface (HDI) less than 10 nm. The goal of this research is to make clear the design guideline of next generation nano-meter spacing HDI. In addition, we studied the peculiar behavior of ultra-thin liquid lubricant films for contact sliders and developed the breakthrough technologies such as nanotextures fabricated by femtosecond laser processing on the air bearing slider surfaces to realize future contact recording. The obtained results are summarized as follows;(1)The spreading characteristics of novel alkanolamine-terminated perfluoropolyether (PFPE) films as well as conventional lubricant films on carbon surfaces were investigated and evaluated experimentally by using a scanning micro-ellipsometer. The apparent diffusion coefficients of the novel lubricants were also studied and they were compared with the conventional lubricants. As a result, the effects of end-groups on … More the spreading characteristics of molecularly thin liquid lubricant films were clarified.(2)The effects of molecularly thin liquid lubricant films on slider hysteresis behavior were investigated experimentally. In other words, the difference in the touchdown and takeoff velocities was monitored by varying the lubricant bonded ration and lubricant film thickness of the disks. As a result, it was suggested that the variation in the touchdown velocity is due to a variation in the intermolecular forces and that the variation in the takeoff velocity is caused by a variation in the friction forces between the slider and disk surface. In addition, the next generation design guideline was clarified for ultra-low spacing of less than 2-3 nm.(3)The effects of ultra-thin liquid lubricant films on contact slider dynamics were investigated, using three types of lubricant, which have different end-groups and molecular weight as a function of lubricant film thickness. As a result, it was found that the lubricant film thickness instability occurs as a result of slider-disk contacts, when the lubricant film thickness is thicker than one monolayer. In addition, it is concluded that the lubricant film thickness should be designed to be one monolayer thickness region.(4)A novel contact slider was proposed and developed. This has nanotextures fabricated by femtosecond laser processing. Contact experiments were also carried out using the fabricated sliders. The feasibility of the developed contact slider technology was confirmed for next-generation HDI design. Less