NDLI: Air Bearing Design to Prevent Reverse Flow from the Trailing Edge of the Slider

Content Provider	Springer Nature Link
Author	Li, Jianhua Xu, Junguo Aoki, Yuichi
Copyright Year	2009
Abstract	A simulation approach that relies on an analysis of the flow patterns closest to an air bearing surface (ABS) was used to predict the lubricant accumulation on the ABS of a head slider. The lubricant accumulation patterns obtained through the simulation were in good agreement with experimental results and with our experimental apparatus. We used this method to study and analyze flow pattern droplets close to the trailing edge of a number of sliders and found that there was a reverse flow from the slider’s trailing edge on both sides of the trailing pad and behind the read/write element, which could result in a lubricant accumulation on the slider surface close to the trailing edge of a slider and thus lead a transient slider vibration and magnetic-signal loss in a hard disk drive. Further simulations and analyses revealed that the reverse flow is dependent on the depth of slider surface on adjacent to the trailing edge of the slider, and that if the depth is less than a critical depth, which is dependent on the velocity of the disk, the reverse flow could be eliminated. On the basis of these findings, we propose a new ABS design concept for effectively suppressing the reverse flow of lubricants from the trailing edge of the slider. In this concept, the slider has a “smooth flow pad” and the depths of outlet recesses are specified as being smaller than the critical depth. It was confirmed by both simulation and experiment that lube accumulation on the slider surface is obviously decreased and the reliability of a hard disk drive with this air bearing design is consequently improved.
Starting Page	113
Ending Page	120
Page Count	8
File Format	PDF
ISSN	10238883
Journal	Tribology Letters
Volume Number	35
Issue Number	2
e-ISSN	15732711
Language	English
Publisher	Springer US
Publisher Date	2009-04-08
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Air bearing design Lubricant droplet Lubricant pickup Accumulation pattern Air flow Reverse flow Air bearing slider Hard disk drive Nanotechnology Physical Chemistry Theoretical and Applied Mechanics Surfaces and Interfaces, Thin Films Tribology, Corrosion and Coatings
Content Type	Text
Resource Type	Article
Subject	Surfaces, Coatings and Films Mechanics of Materials Mechanical Engineering Surfaces and Interfaces

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Lubricant Flow and Accumulation on the Slider’s Air-Bearing Surface in a Hard Disk Drive

Dominant Factors in Lubricant Transfer and Accumulation in Slider-Disk Interface

Lubricant Dewetting on the Slider’s Air-Bearing Surface in Hard Disk Drives

Flying Height Drop Due to Air Entrapment in Lubricant

Investigation of Lubricant Transfer between Slider and Disk Using Molecular Dynamics Simulation

Slider Dynamics over a Discrete Track Medium with Servo Patterns

Air Entrapment in Nanometer-Thick Lubricant Films and its Effect on Slider Flying Height in a Hard Disk Drive

Observation of Slider Landing Process in Hard Disk Drive

Effect of Pitch and Roll Static Angle on Lubricant Transfer Between Disk and Slider

Air Bearing Design to Prevent Reverse Flow from the Trailing Edge of the Slider

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