Slider Air Bearing Design in Consideration of the Pumping Effect

2011 ◽  
Author(s):  
Bo Zhang ◽  
Toshifumi Mawatari ◽  
Akira Nakajima
Keyword(s):  
Shear Stress ◽  
Disk Drive ◽  
Critical Value ◽  
Air Bearing ◽  
Bearing Surface ◽  
Pumping Effect ◽  
Slider Air Bearing ◽  
Different Types ◽  
Bearing Design ◽  
Air Film

The pumping effect proposed by the authors is used to analyze the contamination of the air bearing in hard disk drive. Three different types of air bearing surface are considered in the focus on the accumulation of the contamination at the rear pad where the minimum spacing is located. It is found that the contamination tends to accumulate at both the front and the rear ends of the air bearing surface pad where the shear stress of air film is interrupted due to due to the dramatic change in the spacing. The accumulation at the tailing edge of the air bearing is the most detrimental. The thickness of adsorbed film at the tailing edge increases suddenly when the terrace length at the tailing edge exceeds a critical value, which is in between 15 μm and 35 μm in this article.

Simulation of particle rebounding from the slider air bearing surface

2016 ◽  
Vol 22 (6) ◽  
pp. 1475-1481 ◽  
Author(s):  
Sen Liu ◽  
Hui Li ◽  
Shengnan Shen ◽  
Shijing Wu
Keyword(s):  
Air Bearing ◽  
Bearing Surface ◽  
Slider Air Bearing

Pumping Effect of Slider Air Bearing Surface for Non-Langmuir Adsorption

2010 ◽  
Author(s):  
Bo Zhang ◽  
Akira Nakajima
Keyword(s):  
Disk Surface ◽  
Air Bearing ◽  
Head Disk Interface ◽  
Bearing Surface ◽  
Adsorption Model ◽  
Adsorbed Film ◽  
Disk Interface ◽  
Langmuir Adsorption ◽  
Langmuir Adsorption Model ◽  
Slider Air Bearing

Numerical analysis of the adsorbed film thickness at the air bearing surface is conducted using the non-Langmuir adsorption model. It is found that the adsorbed film at the air bearing surface becomes significant when the viscosity of adsorbed film is higher than about 1 Pa s. The adsorbed contaminant will accumulate at the rear end of the slider, and it is possible that the accumulated liquid-like contaminant may form a liquid tail which will directly contact with the disk surface, resulting in a crush of the head/disk interface.

Slider Curvature Control through Dicing Process

2011 ◽  
Vol 103 ◽  
pp. 92-96
Author(s):  
Chirawat Srisang ◽  
Krisda Siangchaew ◽  
Jakrapong Kaewkhao ◽  
Artorn Pokaipisit ◽  
Pichet Limsuwan
Keyword(s):  
Feed Rate ◽  
Cutting Speed ◽  
Air Bearing ◽  
Bearing Surface ◽  
Separation Processes ◽  
Slider Air Bearing ◽  
Fly Height ◽  
Curvature Control

In the manufacturing of slider, the final step is a dicing process of the rowbars into individual slider. However, in all slider separation processes seem to affect the curvature of the slider air bearing surface (ABS). As a result, the change in ABS crown and camber which can significantly affect the fly height of the slider. This paper investigates the influence of three types of dicing process, with the same feed rate and cutting speed, on the ABS curvature.

Simulations of Air Slider Bearings With Realistic Gas-Surface Scattering

1998 ◽  
Vol 120 (3) ◽  
pp. 639-641 ◽  
Author(s):  
T. E. Wenski ◽  
T. Olson ◽  
C. T. Rettner ◽  
Alejandro L. Garcia
Keyword(s):  
Direct Simulation Monte Carlo ◽  
Disk Drive ◽  
Surface Scattering ◽  
Molecular Gas ◽  
Air Bearing ◽  
Direct Simulation ◽  
Slider Air Bearing ◽  
Accommodation Coefficients ◽  
Simulation Monte Carlo ◽  
Good Agreement

We have calculated the pressure distribution for an infinitely wide plane slider air bearing by using a particle-based direct simulation Monte Carlo method. These simulations include a sophisticated gas-surface scattering model and take measured accommodation coefficients as inputs. Our results are in good agreement with the molecular gas lubrication theory of Fukui and Kaneko for both glass and disk-drive surfaces.

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