Effect of Lubricant on Flyability and Read-Write Performance in the Ultra-Low Flying Regime

Ma, Xiang; Kuo, David; Chen, Jianping; Tang, Huan; Gui, Jing

doi:10.1115/1.1398547

Cited by 36 publications

(22 citation statements)

References 11 publications

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“…Experimental results showed that the flying slider smoothes the lubricant film distribution by carrying the lubricant from thick lubricant region and depositing it onto the thin lubricant region (Ma et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Theoretical analysis of evaporation and re-adsorption of PFPE molecules on hard disk surface

Zhang

Nakajima

2005

Microsyst Technol

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The collision density of the evaporated lubricant molecules in the air with the hard disk was analyzed based on the kinetic theory of gases. It is found that the collision density is quite high even for the ultralow vapor pressure of the lubricant perfluoropolyether used in hard disks. This suggests that the adsorption of the collided molecules may have significant contribution to the lubricant film replenishment. In addition, the adsorption of the lubricant molecules is also expected to reduce the potential barrier to the surface diffusion, and hence to promote the spreading process of lubricant film on hard disk surface. An adsorbing-spreading mechanism is proposed for the lubricant film replenishment in hard disks.

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Section: Introductionmentioning

confidence: 99%

Theoretical analysis of evaporation and re-adsorption of PFPE molecules on hard disk surface

Zhang

Nakajima

2005

Microsyst Technol

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“…Therefore, the effect of ultra-thin liquid lubricant films on air bearing dynamics becomes more and more important and many research works related to such issues have been done. For instance, the effect of the lubricant layer on magnetic recording performance has been studied and significant slider vibration induced by slider-disk dynamic interactions when the slider flies close to the disk surface has been observed (Kuo et al 2001;Ma et al 2002a). A strong dependence of the disk glide avalanche behavior on the lubricant film thickness such that the disk with a thicker lubricant film appeared to have a higher glide avalanche point was also reported from the practical design point of view (Kohira et al 2000).…”

Section: Introductionmentioning

confidence: 85%

Interactions between nano-spacing flying head sliders and ultra-thin liquid lubricant films with non-uniform distribution in hard disk drives

2005

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Interactions between nano-spacing flying head sliders and ultra-thin liquid lubricant films with non-uniform distribution in hard disk drives Abstract This paper describes the effect of ultra-thin liquid lubricant films on air bearing dynamics and flyability of less than 10 nm spacing flying head sliders in hard disk drives. In particular, the effect of non-uniform lubricant film distributions on head/disk interface dynamics are studied. The disks with lubricant on one half of disk surface thicker than the other half were used in this study. The dynamics of sliders is monitored using acoustic emission (AE) and the interactions between the slider and disk are investigated experimentally. The disks were also examined with a scanning micro-ellipsometer before and after each test. Complicated slider responses were observed and clarified. In addition, it was found that the periodic lubricant film thickness modulations or non-uniformity caused by the sliderdisk contact interactions could be observed. It is suggested that this lubricant film thickness non-uniformity will be one of the technical issues in order to achieve ultra-low head/disk contact interface of less than 10 nm.

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“…What appears to be related to the accumulation is the depletion of the lubricant film in the flying track of the slider, although it has been investigated independently [9][10][11]. Experimental results show that the lubricant film thickness in the flying track decreases.…”

Section: Introductionmentioning

confidence: 96%

Pumping effect of sliders in hard disk systems

Zhang

Nakajima

2005

Tribol Lett

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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/in 2 . 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 k 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 k < 0.1 and the adsorption rate-controlling pumping effect for k > 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.

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Effect of Lubricant on Flyability and Read-Write Performance in the Ultra-Low Flying Regime

Cited by 36 publications

References 11 publications

Theoretical analysis of evaporation and re-adsorption of PFPE molecules on hard disk surface

Theoretical analysis of evaporation and re-adsorption of PFPE molecules on hard disk surface

Interactions between nano-spacing flying head sliders and ultra-thin liquid lubricant films with non-uniform distribution in hard disk drives

Pumping effect of sliders in hard disk systems

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