Lubricant thickness modulation induced by head-disk dynamic interactions
Lubricant thickness modulation induced by head-disk dynamic interactions
复制标题
头盘动态相互作用引起的润滑剂厚度调节
DOI：
10.1109/tmag.2002.988921
复制
发表时间：
2002
影响因子：
2.1
通讯作者：
J. Gui
中科院分区：
文献类型：
--
作者：
Xiaoding Ma;Huan Tang;M. Stirniman;J. Gui
本文用HDI-SRA装置研究了磁头飞行后润滑油在磁盘上的再分布，研究了磁头飞行时润滑油膜的行为。润滑油耗尽轨道上观察到的磁盘表面上，更有趣的是，润滑油膜被发现表现出周期性的厚度调制的downtrack方向。润滑剂厚度调制的波长被发现与磁盘的线速度线性增加，并依赖于弱的润滑剂类型和润滑剂粘结比。调制幅度随飞行时间缓慢增长。负压空气轴承皮科滑块和双体船式正压纳米滑块在润滑膜上产生类似的图案。厚度调制的频率在40-50 kHz的范围内，并且归因于盘润滑剂与滑块辊模式的相互作用。此外，对于高度结合的润滑剂膜，在196 kHz的频率下可以看到精细得多的润滑剂调制图案，该频率非常接近滑块的俯仰模式的频率。这些结果表明，在磁盘上的润滑剂厚度调制所产生的滑块-磁盘的动态相互作用，是由于滑块体运动。
The behavior of a thin lubricant film under a flying head has been studied by examining the lubricant redistribution on the disk after flying, using an HDI-SRA instrument. Lubricant depletion tracks were observed on the disk surfaces and, more interestingly, the lubricant film was found to exhibit a periodic thickness modulation in the downtrack direction. The wavelength of the lubricant thickness modulation is found to increase linearly with the disk linear velocity, and depends weakly on the lube type and lube bonding ratio. The amplitude of the modulation grows slowly with flying time. Both negative-pressure air bearing pico sliders and catamaran-style positive-pressure nano sliders generate similar patterns on lubricant films. The frequency of the thickness modulation is in the range of 40-50 kHz, and is attributed to interactions of the disk lubricant with the slider roll mode. In addition, for highly-bonded lubricant films, a much finer lubricant modulation pattern can be seen with a frequency of 196 kHz, which is very close to the frequency of the pitch mode of the slider. These results indicate that the lubricant thickness modulations on-the disk are generated by slider-disk dynamic interactions, and are due to slider body motions.