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

为了实现大于1 Tb/in 2的面记录密度，需要开发小于10 nm的纳米级头盘界面（HDI）。本研究的目的是明确下一代纳米间距HDI的设计准则。此外，我们研究了超薄液体润滑膜的特殊行为的接触滑块和开发的突破性技术，如纳米纹理的空气轴承滑块表面的飞秒激光加工，以实现未来的接触记录。主要研究结果如下：（1）采用扫描显微椭偏仪对新型链烷醇胺封端全氟聚醚（PFPE）膜和传统润滑膜在碳表面的铺展特性进行了研究和评价。研究了新型润滑剂的表观扩散系数，并与传统润滑剂进行了比较。因此，端基对 ...更多信息 阐明了分子薄液体润滑膜的铺展特性。（2）实验研究了分子薄层液体润滑膜对滑块迟滞特性的影响。换句话说，通过改变盘的润滑剂结合比和润滑剂膜厚度来监测着陆和起飞速度的差异。因此，有人建议，降落速度的变化是由于分子间力的变化，而起飞速度的变化是由滑块和磁盘表面之间的摩擦力的变化引起的。此外，还阐明了下一代小于2-3 nm的超低间距设计指南。（3）采用三种不同端基和分子量的润滑剂，研究了超薄液体润滑膜对接触滑块动力学特性的影响。结果发现，当润滑剂膜厚度大于一个单层时，由于滑块-盘接触而发生润滑剂膜厚度不稳定性。此外，得出润滑膜厚度应设计为一个单层厚度区域的结论。(4)A提出并研制了一种新型接触滑块。这具有通过飞秒激光加工制造的纳米纹理。接触实验也进行了使用制造的滑块。所开发的接触滑块技术的可行性被确认为下一代HDI设计。少

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