摘要
当硬盘驱动器的磁头飞行高度处于几纳米的范围内,需要考虑浮动块与磁盘间介质对分子间作用力的影响。采用修正的Hamaker常数,推导出适合于浮动块与磁盘界面的分子作用力计算公式;然后,以双轨浮动块和ASS浮动块为例,采用数值积分方法,研究了润滑层对分子作用力与最小飞行高度之间关系。数据结果显示,当润滑层厚度小于1nm时,润滑层能明显地减小分子作用力;当润滑层厚度大于2nm时,继续增加润滑层厚度,分子作用力减小幅度降低。通过研究润滑层对分子作用力与俯仰角之间关系,可以发现润滑层对其影响较小。最后,采用有限体积法计算楔形浮动块的气膜压力分布,研究了楔形浮动块考虑润滑层的分子间作用力与气膜力耦合后的总承载力与最小飞行高度的关系。结果表明:润滑层在浮动块最小飞行高度小于2nm时对总承载力的影响较大;浮动块在没有润滑层的磁盘上以超低飞行高度飞行时更容易与磁盘发生碰撞。
As the flying height of a hard drive head is within a few nanometers,it is necessary to consider the effect of the medium on intermolecular force between the head and the disk.The molecular interaction formula in the head/disk interface is derived by adopting the amended Hamaker constant.Then,the effect of the lubricating layer on intermolecular forces is studied by taking a double-track slider and an advanced step slider（ASS） as examples and using numerical integration method.It is found that the lubricating layer can significantly reduce the intermolecular force when the thickness of the lubricating layer is less than 1nm.The rate of reduction of intermolecular force is low by continuing to increase the lubricating layer thickness when the lubricating layer is thicker than 2nm.The effect of the lubricating layer on the relationship between the intermolecular forces and pitch angle is proved small.Finally,the air bearing force for the wedge-type slider is calculated by using the finite volume method and the relationship is studied between the total air bearing force including intermolecular force considering lubricating layer and minimum flying height.The result shows that the lubricating layer has greater impact on the total air bearing force when the slider flying height is less than 2nm,and that the collision between the slider and the disk is more likely to happen when the slider is flying at an ultra-low altitude on the disk without lubricating layer.
出处
《山东建筑大学学报》
2010年第6期613-618,共6页
Journal of Shandong Jianzhu University
