Dynamic Stability and Spacing Modulation of Sub-25 nm Fly Height Sliders

Hu, Yong; Bogy, David B.

doi:10.1115/1.2833864

Cited by 20 publications

(8 citation statements)

References 12 publications

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“…Therefore, we know that the contact occurs at the trailing edge of the slider trailing edge pad. The behavior of the slider is similar to that described in the reference [13]. The slider reacts slightly as the bumps travel under the front part of the slider and experiences larger oscillation as the bumps encounter the more sensitive lower film thickness portions of the bearing.…”

Section: Resultsmentioning

confidence: 76%

“…The minimum bump height is determined by the slider form factor, its air bearing stiffness, damping ratio and minimum FH, and the bump size and shape. It has been reported based on simulations [13] that a nano slider with a 12 nm minimum FH will not contact a bump unless the bump height reaches 14 nm. A pico negative pressure slider with a 14 nm minimum FH will not contact bump when the bump height is lower than 21 nm.…”

Section: Introductionmentioning

confidence: 98%

“…The slider-bump interaction process has been one of the most important subjects for slider air bearing dynamics and has been widely studied by simulations and experiments [13][14][15][16][17][18][19]. Hu and Bogy [13] simulated the performance of sliders flying over a rectangular bump on a disk surface.…”

Section: Introductionmentioning

confidence: 99%

“…Hu and Bogy [13] simulated the performance of sliders flying over a rectangular bump on a disk surface. It is found that the air bearings of a nano slider and a pico slider with a 15 nm FH are disturbed by flying over a 10 nm high and 25 lm wide bump.…”

Section: Introductionmentioning

confidence: 99%

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Slider–bump contact and flying height calibration

Liu

Wang

et al. 2006

Tribol Lett

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It is a big challenge to determine ultra-low slider flying height accurately. The standard bump disk method is probably the most reliable and acceptable method so far. One of the key issues to determine slider-flying height with the bump disk method is the complicated slider-bump interaction process and the possible disturbance of the bumps on the slider flying performance. Our knowledge about the slider-bump interaction process is still very limited due to the lack of an effective and powerful experimental technique to study it. In this work, the slider-bump interaction process was studied with a dynamic flying height-attitude (3D) system. The interaction process was also simulated to compare with the experimental observations and to help determine the sliderbump contact points in the experimental observations. The accuracy of flying height (FH) calibration with the bump disk method and the minimum slider-bump interference height required for the testing system used in this study to detect the onset of sliderbump contact were analyzed and discussed. It is proved that the 3D system is a very useful and powerful tool for the application. Many details of the slider-bump interaction process can be revealed with the 3D system. It is found that the calibrated FH is much more accurate than that predicated by the simulations.

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Section: Resultsmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Slider–bump contact and flying height calibration

Liu

Wang

et al. 2006

Tribol Lett

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show abstract

“…For this study, we use the first order slip model Q=1+(6aKn 0 )/(PH), where a=(2-)/ is the accommodation factor. Although the finite element method (FEM) has been used in the solution of the Reynolds equation [14], the finite difference method appears to be the method of choice for many researchers [3,4,6,9]. Singular perturbation techniques for asymptotic solution [5] had also been tried but had not gained popular support.…”

Section: Numerical Solution For the Compressible Reynolds Equationmentioning

confidence: 99%

Motion of nanoscale contaminant particles in air bearings under electrostatic charges: a case study

Yeigh¹,

Polwort²,

Gipson³

2009

Mesh Reduction Methods

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This case study examines the possible effect that electrostatic forces may have on debris particle motion through the interface between two sliding surfaces in an air bearing. It uses as an example the read/write head and disk surface of a typical modern hard disk drive. The Reynolds equation for compressible fluids at high bearing numbers is solved using a factored implicit scheme. A first-order molecular slip correction is also applied. Debris particle motion equations are derived with corrections for gravity, drag, and the Saffman lift effect from previous studies and combined with an equation for electrostatic forces proposed in this study. Aluminum debris particles ranging from 150 to 300nm are introduced and tracked by solving motion equations using Runge-Kutta methods. Electrostatic forces acting on a debris particle were found to affect trajectories at levels of charge far lower than anticipated. Charges at levels as low as 1.5 electrons influenced particle motion significantly.

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Numerical study of flow and thermal behaviour of lid-driven flows in cavities of small aspect ratios

Chen

Cheng

2006

Int. J. Numer. Meth. Fluids

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SUMMARYNumerical study has been performed to investigate the e ects of cavity shape on ow and heat transfer characteristics of the lid-driven cavity ows. Dependence of ow and thermal behaviour on the aspect ratio of the cavities is also evaluated. Three types of the cross-sectional shape, namely, circular, triangular, and rectangular, and four aspect ratios, 0:133; 0:207; 0:288, and 0.5, are taken into account to construct twelve possible combinations; however, attention is focused on the small-aspect-ratio situations. Value of the Reynolds number considered in this study is varied between 100 and 1800. For the cases considered in this study a major clockwise vortex driven by the moving lid prevailing in the cavity is always observed. When the Reynolds number is ÿxed, the rectangular cavity produces strongest lid-driven ow, and the triangular cavity weakest. For the cases at small aspect ratio and low Reynolds number, the streamlines appear symmetric fore-and-aft with respect to the central line at x=L = 0:5. Data for the local and average Nusselt numbers are also provided. For rectangular cavities, it is observed that case 1=5R produces the highest average Nusselt number at any Reynolds number. Among the twelve possible geometric cases considered herein, the highest and lowest average Nusselt numbers are found with cases 1=6T and 1=2C, respectively.

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Dynamic Stability and Spacing Modulation of Sub-25 nm Fly Height Sliders

Cited by 20 publications

References 12 publications

Slider–bump contact and flying height calibration

Slider–bump contact and flying height calibration

Motion of nanoscale contaminant particles in air bearings under electrostatic charges: a case study

Numerical study of flow and thermal behaviour of lid-driven flows in cavities of small aspect ratios

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