Lubrication effects on head–disk spacing loss

Demczyk, B. G.; Liu, Janice; Chen, Chao Y.; Zhang, Shuyu

doi:10.1016/j.triboint.2005.01.018

Cited by 16 publications

(7 citation statements)

References 3 publications

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“…Hysteresis has thus far been analytically demonstrated to be a result of meniscus forces, as well as intermolecular forces (Kato et al 2000;Iida and Ona 2003;Thornton and Bogy 2003). Experimental studies have also been carried out to verify such analytical results (Ambekar et al 2005;Demczyk et al 2005;. However, it appears that our present understanding of slider hysteresis is still limited because of the complicated behavior of air bearing sliders and lubricant films.…”

Section: Introductionmentioning

confidence: 99%

Effect of humidity on the interactions between probes and ultra-thin liquid lubricant films in an environmentally controlled atomic force microscope

2009

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To achieve a magnetic recording density of 1 Tb/in 2 , the required head-disk spacing is expected to be less than 2-3 nm. However, a critical issue in achieving such an ultra-low spacing is the dynamic instability of the head-disk interface (HDI), that is, the experimentally observed hysteresis of the flying sliders. It is important to clarify the interactive forces between the sliders and disk surfaces in a nanometer HDI. In addition, the adhesive forces between the thermally protruding magnetic head writer pole tip, which exists in the most commercially available recording head, and the lubricant film have also become very important. Therefore, in this study, the interactions between the probes of an environmentally controlled atomic force microscope (AFM) and ultra-thin liquid lubricant films were studied as a model experiment, resulting in the acquisition of fundamental knowledge related to the adhesive forces as well as the slider hysteresis. Subsequently, the effect of humidity on the force curve characteristics was investigated by varying the lubricant film thickness. As a result, it was found that the probe touchdown occurred earlier as the humidity increased, with its driving force suggested to be the force of the lubricant meniscus formed on the AFM probe. The probe touchdown occurred earlier for lubricants with a higher mobility. The adhesive force gradually increased with the humidity and was at its minimum for a one monolayer film thickness, independent of the lubricant materials. On the other hand, the elongation of the lubricant meniscus increased with the humidity. Therefore, the probe takeoff occurred later as the humidity increased. Accordingly, the hysteresis increased with the humidity and was mainly dependent on the elongation of the meniscus.

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Section: Introductionmentioning

confidence: 99%

Effect of humidity on the interactions between probes and ultra-thin liquid lubricant films in an environmentally controlled atomic force microscope

2009

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“…It is reported that the hysteresis is related to the lubricant thickness and the percentage of mobile lubricant (Ambekar et al 2005;Demczyk et al 2005;Tagawa et al 2005). In general, thicker lubricant seems to have lower takeoff speed and lower touchdown speed (Ambekar et al 2005), or lower takeoff pressure and lower touchdown pressure (Demczyk et al 2005;Tagawa et al 2007). One possible explanation is that the lubricant may influence the Hamaker constant for the intermolecular force, and therefore the takeoff and touchdown performances are changed.…”

Section: Discussion On Short Range Forces and Lubricant Interactionmentioning

confidence: 99%

Contact recording review

Hua

Liu

et al. 2010

Microsyst Technol

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Various contact recording technologies for hard disk drives are reviewed. The advantages and disadvantages of each approach to contact recording are analyzed. Experimental detection methods and simulation models for the contact force are introduced. Some important technologies related to contact recording are addressed. The effects of lubricant and the short range forces on contact recording are discussed, and the dynamic flying characteristics of a slider with spherical pad at trailing edge are studied. It is suggested that a thermal protrusion slider with a spherical pad at the trailing edge may be a possible approach for the success of contact recording.

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“…The unique effects of slider-lubricant interaction and the associated nonlinearity have been characterized [52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71]. Dynamic lubricant meniscus force was once idealized as in the static case [19,20], in which the disk velocity is not considered.…”

Section: Nonlinear Dynamics Of Slider In Sub-10 Nm Clearance Regimementioning

confidence: 99%

Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

Sheng

2011

Advances in Tribology

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This paper provides an overview of the problems pertaining to the sensing and identification of nonlinear dynamics of slider with clearance in sub-5 nanometer regime. This problem is complex in nature because the nonlinear dynamics of slider in sub-5 nanometer clearance regime involves different sources of nonlinear, nonstationary, and uncertainty characteristics. For example, the involved forces such as air-bearing force, intermolecular force, and contact forces are all nonlinear. The complex interface interaction with mobile lubricant makes the slider response be nonstationary. Furthermore, the interfacial parameters are available only by assumptions in the sense of statistics. Most of the reported studies either focused on physics-based simulations by using assumed interfacial parameters or focused on experimental characterization. The issues of the sensing and identification of the nonlinear dynamic properties of slider in nanometer clearance regime will be discussed with an aim at illustrating the promising approaches for improving the correlation between test data and physics-based simulations.

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Lubrication effects on head–disk spacing loss

Cited by 16 publications

References 3 publications

Effect of humidity on the interactions between probes and ultra-thin liquid lubricant films in an environmentally controlled atomic force microscope

Effect of humidity on the interactions between probes and ultra-thin liquid lubricant films in an environmentally controlled atomic force microscope

Contact recording review

Sensing and Identification of Nonlinear Dynamics of Slider with Clearance in Sub-5 Nanometer Regime

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