Possibility of Organic Monolayer Films as Lubricants for Disk Drives: Comparative Study of PFPE and Organosilane

2003 ◽  
Vol 125 (4) ◽  
pp. 850-853 ◽  
Author(s):  
Junho Choi ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato
Keyword(s):  
Hard Disk ◽  
Disk Drive ◽  
Monolayer Films ◽  
Organic Monolayer ◽  
Pfpe Lubricant ◽  
Coated Surface ◽  
Carbon Overcoats ◽  
Drive Systems ◽  
Magnetic Hard Disk ◽  
Chain Lengths

Organosilane monolayer of 1H,1H,2H,2H-perfluorodecyltrichlorosilane and PFPE lubricant films were deposited on magnetic hard disk surfaces protected with amorphous carbon overcoats, and their frictional properties were investigated by a ball-on-flat tribotester. The thickness of PFPE films having only an immobile layer or both immobile and mobile layers was varied from about 0.6 nm to 4 nm. The friction coefficient of the organosilane monolayer coated surface is comparable to that of the PFPE coated surface with a 1.0 nm thick immobile layer and lower than that of the PFPE coated surface with a 0.6 nm thick immobile layer. The thickness of the lubricant has to decrease to less than 1 nm to further increase recording density. In that case, the mobile portion of PFPE lubricant is negligible. This study suggests that organosilane monolayers (with shorter chain lengths) may be used as an alternate lubricant in hard disk drive systems.

Analog Frontend for Tribo-Current-Based Fly-Height Sensor for Magnetic Hard Disk Drive

2018 ◽  
Vol 65 (2) ◽  
pp. 556-566
Author(s):  
Arup Polley ◽  
Pankaj Pandey ◽  
Bryan E. Bloodworth ◽  
Costin Cazana
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Magnetic Hard Disk ◽  
Fly Height

Bifurcation Approach to the Analysis of Multiple Flying Height States in Load/Unload Hard Disk Drive Systems

2005 ◽  
Author(s):  
Pyung Hwang ◽  
Polina V. Khan
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Numerical Continuation ◽  
Continuation Methods ◽  
Multiple Equilibrium ◽  
Flying Height ◽  
Drive Systems ◽  
The Relationship ◽  
Force Equilibrium

The application of numerical continuation methods to calculate suspension force-equilibrium position curve for hard disk drive sliders is proposed. The method efficiently detects multiple equilibrium positions. The relationship between suspension force offset and critical preload is found for the femto slider.

Novel Magnetic Micro-Tweezers Leveraging on Magnetic Hard-Disk Drive Technology

2006 ◽  
Author(s):  
M. L. Chan ◽  
G. M. Jaramillo ◽  
D. A. Horsley
Keyword(s):  
Image Processing ◽  
Hard Disk Drive ◽  
Particle Tracking ◽  
Magnetic Particles ◽  
Hard Disk ◽  
Disk Drive ◽  
Video Capture ◽  
Magnetic Tweezer ◽  
Particle Tracking Algorithm ◽  
Magnetic Hard Disk

We report the implementation of a magnetic tweezer using an inductive write head from a hard-disk drive for applying forces to micro-magnetic particles in a microscopy setup. Forces are generated by magnetic particles in reaction to the localized fields across the inductive head gap. This allow for mechanical manipulation and measurement of particles in fluid. The displacement is measured through image processing and particle tracking algorithm from the video capture data. We demonstrated the magnetic tweezer system with application to 1-2 μm paramagnetic and 4.5 μm ferromagnetic microparticles and measured forces in the range of 0.1–4 pN.

Tribochemical Polishing of Aluminum Oxide in the Atmosphere of CHF3

2005 ◽  
Author(s):  
Takao Soejima ◽  
Katsuyuki Okubo ◽  
Ken’ichi Hiratsuka ◽  
Yukihiro Sakamoto
Keyword(s):  
Aluminum Oxide ◽  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Gaseous Atmosphere ◽  
Radical Reactions ◽  
Thermally Stable ◽  
Gas Atmosphere ◽  
Tribochemical Processes ◽  
Magnetic Hard Disk

Fluorinated hydrocarbon has been used as lubricants on the surface of magnetic hard disk drive. This is because this compound is thermally stable. However it has been found that fluorinated hydrocarbon was degraded on the surface during friction to generate radicals1,2). Therefore we considered that hard ceramics will be worn out in the gaseous atmosphere of fluorinated hydrocarbon by radical reactions. If the interaction of gas to ceramics is strong, we can expect that the surface will be polished through tribochemical processes. In the present paper, we investigated the characteristic of tribochemical polishing of aluminum oxide against glass in CHF3 gas atmosphere.

Ultrathin CNx Overcoats for 1 Tb/in2 Hard Disk Drive Systems

2001 ◽  
Author(s):  
De-Jun Li ◽  
Murat U. Guruz ◽  
Yip-Wah Chung
Keyword(s):  
Carbon Nitride ◽  
Hard Disk ◽  
Corrosion Damage ◽  
Disk Drive ◽  
Dc Magnetron Sputtering ◽  
Pulsed Dc ◽  
Fold Reduction ◽  
Pulsed Dc Magnetron Sputtering ◽  
Improved Performance ◽  
Drive Systems

Abstract Carbon nitride films were grown on silicon and hard disk substrates using pulsed dc magnetron sputtering in a single cathode deposition system. Substrates were mounted on a specially designed rotating holder that allowed 45° tilt angle and substrate rotation about the surface normal up to 20 rpm. AFM scans over 10×10 μm2 showed that 50 nm thick CNx films prepared under optimum substrate bias conditions have r.m.s. surface roughness almost four times lower than those prepared without substrate tilt and rotation. We observed a two-fold reduction in corrosion damage for hard disk substrates with 1 nm CNx overcoats deposited with substrate tilt and rotation. This improved performance is likely a result of more efficient and uniform momentum transfer parallel to the surface during deposition in this configuration.

Settling control with reference redesign for dual actuator hard disk drive systems

2004 ◽  
Vol 28 (2) ◽  
pp. 219-227 ◽  
Author(s):  
Jiagen Ding ◽  
Shang-Chen Wu ◽  
Masayoshi Tomizuka
Keyword(s):  
Hard Disk Drive ◽  
Hard Disk ◽  
Disk Drive ◽  
Drive Systems
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