Pumping effect of sliders in hard disk systems
Pumping effect of sliders in hard disk systems
复制标题
DOI：
10.1007/s11249-004-2755-6
复制
发表时间：
2005
影响因子：
3.2
通讯作者：
Bo Zhang;A. Nakajima
中科院分区：
文献类型：
--
作者：
Bo Zhang;A. Nakajima
在硬盘驱动器中，污染物在滑块表面的积累是至关重要的，因为只有极少量的污染物在滑块表面就会导致硬盘驱动器的灾难性故障，滑块和硬盘之间的间距只有10纳米，为了达到100 Gbit/in2的记录密度，在不久的将来将进一步减少到约5-6纳米。本文提出滑块的泵送效应是污染物在滑块上积聚的机理之一。从连续体角度考虑滑块表面的吸附过程和剪切流动过程，对泵送效果进行了分析。根据吸附膜最大剪切流量与最大吸附量之比λ的取值，可将泵送效果分为两类：λ < 0.1时为控制剪切流量的泵送效果，λ > 0.4时为控制吸附速率的泵送效果。对于剪切流量控制效果，污染物的积累速率与圆盘表面速度成正比，与滑块的飞行高度成反比。
The accumulation of contaminants on the slider surface is of paramount importance in hard disk drives because only an ultra small amount of contaminants on the slider surface will cause catastrophic failures for hard disk drives with a spacing between the slider and the hard disk as small as 10 nm, which will be reduced further in the near future to about 5–6 nm in order to attain a recording density of 100 Gbit/in2. In this paper the pumping effect of the slider is proposed as one mechanism of the contaminant accumulation on the slider. Analysis of the pumping effect is conducted by considering the adsorption process and the shear flow process on the slider surface in terms of the continuum. It is found that the pumping effect can be divided into two different classifications depending on the value of the parameter λ which is the ratio of the maximum shear flow of the adsorbed film to the maximum adsorption amount: the shear flow rate-controlling pumping effect for λ < 0.1 and the adsorption rate-controlling pumping effect for λ > 0.4. For the shear flow rate-controlling effect, the accumulation rate of the contaminant is directly proportional to the disk surface velocity, while inversely proportional to the flying height of the slider.