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.

scholarly journals Parametric Investigations at the Head-Disk Interface of Thermal Fly-Height Control Sliders in Contact

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Sripathi V. Canchi ◽  
David B. Bogy ◽  
Run-Han Wang ◽  
Aravind N. Murthy
Keyword(s):  
Hard Disk Drives ◽  
Air Bearing ◽  
Head Disk Interface ◽  
Bearing Surface ◽  
Surface Design ◽  
Disk Interface ◽  
Height Control ◽  
Experimental Findings ◽  
And Control ◽  
Fly Height

Accurate touchdown power detection is a prerequisite for read-write head-to-disk spacing calibration and control in current hard disk drives, which use the thermal fly-height control slider technology. The slider air bearing surface and head gimbal assembly design have a significant influence on the touchdown behavior, and this paper reports experimental findings to help understand the touchdown process. The dominant modes/frequencies of excitation at touchdown can be significantly different leading to very different touchdown signatures. The pressure under the slider at touchdown and hence the thermal fly-height control efficiency as well as the propensity for lubricant pickup show correlation with touchdown behavior which may be used as metrics for designing sliders with good touchdown behavior. Experiments are devised to measure friction at the head-disk interface of a thermal fly-height control slider actuated into contact. Parametric investigations on the effect of disk roughness, disk lubricant parameters, and air bearing surface design on the friction at the head-disk interface and slider burnishing/wear are conducted and reported.

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.

Meniscus Adhesion at Ultra-Low Flying Slider-Disk Interfaces

2005 ◽  
Author(s):  
C. Mathew Mate ◽  
Robert N. Payne ◽  
Peter Baumgart ◽  
Kathy Kuboi
Keyword(s):  
Experimental Evidence ◽  
Van Der Waals ◽  
Adhesive Force ◽  
Air Bearing ◽  
Disk Drives ◽  
Bearing Surface ◽  
Slider Air Bearing ◽  
Adhesive Forces

As head-disk spacings in disk drives approach a few nanometers, adhesive forces between the slider and disk can drastically alter the slider flying dynamics. At these small separations, it is still unclear, however, what type of adhesive force dominates. Most previous studies have concentrated on van der Waals and electrostatic attractive forces [1], which are readily incorporated into air bearing simulations. In this talk, we provide experimental evidence that the dominant adhesive force originates from menisci forming around the low flying portions of the slider air-bearing-surface as the spacing transitions from near-contact to contact.

The Double Dimple Magnetic Recording Head Suspension and Its Effect on Fly Height Variability

1995 ◽  
Vol 117 (2) ◽  
pp. 267-271
Author(s):  
J. C. Harrison ◽  
K. P. Hanrahan
Keyword(s):  
Degrees Of Freedom ◽  
Initial Conditions ◽  
Flying Height ◽  
Air Bearing ◽  
Bearing Surface ◽  
Percent Reduction ◽  
Recording Head ◽  
Head Gimbal Assembly ◽  
Magnetic Recording Head ◽  
Fly Height

A gimbal forming modificaton is presented which, when implemented, leads to significant reduction in air bearing surface (ABS) static attitude and flying height variability within head-gimbal assembly (HGA) populations. The modification requires no additional parts or steps in the manufacture of the suspension assembly. An experimental test of the concept is described, along with the procedure on which it is based. The resulting reduction in product variability is obtained without measurement of (or tailoring to) the initial conditions of the constitutive parts of each HGA. A ≈ 50 percent reduction in static attitude variability, and a ≈ 33 percent reduction in flying variability, was experimentally shown to result from the adoption of the Double Dimple design concept, in all flying degrees of freedom.

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.

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