Overcoat Wear and Dynamic Friction Study at the Head-Disk Interface

2014 ◽  
Author(s):  
Sukumar Rajauria ◽  
Sripathi Canchi ◽  
Erhard Schreck ◽  
Bruno Marchon
Keyword(s):  
Shear Strength ◽  
Friction And Wear ◽  
Physical Contact ◽  
Dynamic Friction ◽  
Head Disk Interface ◽  
Friction Measurement ◽  
Disk Interface ◽  
Wear Process ◽  
The Individual ◽  
Friction Study

The dynamic friction and wear at the head and the disk interface is investigated with the motive of understanding the head overcoat wear process associated with physical contact between the head and the disk. In this work, the results from systematic experiments under overpush conditions are presented. Various regimes of head wear are identified based on the individual wear rate of the participating overcoat layers. A strain gauge based friction measurement is used to extract the friction coefficient and the adhering shear strength between the head and the disk.

Dynamic Friction Study on Voltage Assisted Overcoat Wearing Head-Disk Interface

2016 ◽  
Author(s):  
Sukumar Rajauria ◽  
Sripathi Canchi ◽  
Erhard Schreck ◽  
Bruno Marchon ◽  
Qing Dai
Keyword(s):  
Quantitative Analysis ◽  
Strain Gauge ◽  
Dynamic Friction ◽  
Head Disk Interface ◽  
Friction Measurement ◽  
Carbon Overcoat ◽  
Sliding Speed ◽  
Disk Interface ◽  
Positive Voltage ◽  
Friction Study

Voltage assisted wear at the head and the disk interface is investigated with the motive of understanding the head overcoat wear processes. In this work, we report the quantitative analysis of voltage assisted wear on head carbon overcoat at high sliding speed interfaces. We found that voltage assisted TFC head wear acts asymmetrically at the interface with positive voltage leading to high wear. We quantitatively analyzed the interface using a strain gauge based friction measurement.

Experimental and analytical studies of dynamic friction at the head/disk interface

2000 ◽  
Vol 33 (5-6) ◽  
pp. 343-351 ◽  
Author(s):  
Huan Tang ◽  
Li-Ping Wang ◽  
Jing Gui ◽  
David Kuo
Keyword(s):  
Dynamic Friction ◽  
Head Disk Interface ◽  
Disk Interface ◽  
Analytical Studies

Sliding Failure Model for Magnetic Head-Disk Interface

1990 ◽  
Vol 112 (2) ◽  
pp. 299-303 ◽  
Author(s):  
P. A. Engel ◽  
B. Bhushan
Keyword(s):  
Friction And Wear ◽  
Time To Failure ◽  
Failure Model ◽  
Head Disk Interface ◽  
Magnetic Head ◽  
Disk Interface ◽  
Damage Rate ◽  
Debris Particles ◽  
Physical Variables ◽  
Topographic Parameters

A mechanical model is presented for the “time to failure” of a sliding magnetic head-disk interface system. The principal physical variables include the sliding speed, surface topography, elastic mechanical properties, coefficient of friction, and wear rate. Surface protrusions, such as asperities and debris particles, induce impact and sliding encounters which represent a damage rate. Failure occurs when a specific damage rate, a characteristic for the system, is reached. Modeling uses a set of topographic parameters describing the changing, wearing surface.

Effect of particulate contamination on the friction and wear of a magnetic head-rigid disk interface

2000 ◽  
Vol 214 (5) ◽  
pp. 493-505 ◽  
Author(s):  
S Chandra ◽  
B Bhushan
Keyword(s):  
Failure Mechanism ◽  
Friction And Wear ◽  
Particle Concentration ◽  
Damage Mechanism ◽  
Flying Height ◽  
Head Disk Interface ◽  
Magnetic Head ◽  
Disk Interface ◽  
Particulate Contamination ◽  
Rigid Disks

Particulate contamination studies were carried out with laser-textured and mechanically textured magnetic rigid disks and nanosliders. The effects of particle concentration and its size, particle material, duration of exposure to contamination, interface speed and disk textures were studied. The head-disk interface (HDI) durability increased as particle concentration decreased. The effect of different hard-particle materials was attributed to how easily it can form agglomerates. Data indicate that limited-time exposure to a class 10 000 environment will not deter tribological performance of the HDI. In a contaminated environment, head flying in the data zone exhibited higher durability than that in the-lase textured zone. However, the mechanically textured disk and the data zone of laser-textured disks showed comparable durability in the presence of contamination. The HDI damage mechanism and pattern changed as the disk speed changed. A failure mechanism to show how the airborne particles interact with the interface is presented. The effects of the HDI geometry, flying height, pitch angle which controls the air flow pattern govern the failure mechanism in the flying mode.

A study of dynamic friction at the head–disk interface

2000 ◽  
Vol 87 (9) ◽  
pp. 6152-6154 ◽  
Author(s):  
Huan Tang ◽  
Li-Ping Wang ◽  
Jing Gui ◽  
David Kuo
Keyword(s):  
Dynamic Friction ◽  
Head Disk Interface ◽  
Disk Interface

Slider Overcoats for Enhanced Interface Durability in Magnetic Recording Applications

1995 ◽  
Vol 117 (1) ◽  
pp. 86-93 ◽  
Author(s):  
S. K. Ganapathi ◽  
Timothy A. Riener
Keyword(s):  
Magnetic Recording ◽  
Friction And Wear ◽  
Disk Drive ◽  
Disk Surface ◽  
Electrical Performance ◽  
Head Disk Interface ◽  
Bearing Surface ◽  
Component Level ◽  
Disk Interface ◽  
Significant Performance

The effects on tribological performance of air bearing surface overcoats on magnetic recording sliders are presented. Both component level and disk drive level testing indicate that significant performance enhancements are afforded by the overcoat, and that both stiction/friction and wear of the head/disk interface are reduced, thus increasing interface durability. The degradation in electrical performance of the heads due to the presence of the overcoat is shown to be consistent with that predicted by the Wallace equation. In addition, it is shown that the performance enhancements of the overcoat are achieved only in the presence of lubricant on the disk surface, suggesting that the overcoat lubricant interaction may be more benign than the interaction of the lubricant with the slider material.

The Solidarity of Distance1

2005 ◽  
Vol 36 (3) ◽  
pp. 103-115 ◽  
Author(s):  
Robert A. Wicklund
Keyword(s):  
Physical Contact ◽  
Emotional Distance ◽  
Starting Point ◽  
Shared Emotions ◽  
Common Goals ◽  
Full Interaction ◽  
The Individual ◽  
Social Incompetence

Abstract: Solidarity in the classic sense pertains to a cohesion among humans that entails physical contact, shared emotions, and common goals or projects. Characteristic cases are to be found among families, close friends, or co-workers. The present paper, in contrast, treats a phenomenon of the solidarity of distance, a solidarity based in fear of certain others and in incompetence to interact with them. The starting point for this analysis is the person who is motivated to interact with others who are unfamiliar or fear-provoking. Given that the fear and momentary social incompetence do not allow a full interaction to ensue, the individual will move toward solidarity with those others on a symbolic level. In this manner the motivation to approach the others is acted upon while physical and emotional distance is retained.

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