Surface analysis and application in magnetic hard disk media

2002 ◽  
Author(s):  
R. Gopalakrishnan
Keyword(s):  
Surface Analysis ◽  
Hard Disk ◽  
Magnetic Hard Disk

Experimental Observation of Fractal-Regular Surfaces and a Transformation Scheme for Extracting Fractal Parameters

2005 ◽  
Author(s):  
Shao Wang ◽  
Wai Kin Chan
Keyword(s):  
Silicon Wafer ◽  
Roughness Parameter ◽  
Hard Disk ◽  
Spectral Density Function ◽  
Power Spectral ◽  
Fractal Parameters ◽  
Asperity Contacts ◽  
Fractal Roughness ◽  
Magnetic Hard Disk ◽  
Wafer Surfaces

To account for the effects of asperity contacts at various length scales, it is appropriate to characterize an engineering surface as a fractal-regular surface. In spite of significant theoretical advancement, there is a desperate need for experimental verification of the theory of fractal-regular surfaces and a consistent scheme of obtaining the fractal parameters. In the present study, the existence of a fractal region and a regular-shape region in the power spectral density function for fractal-regular surfaces was confirmed experimentally, for the first time, with data obtained from magnetic hard disk and silicon wafer surfaces. A novel scheme involving a variable transformation was developed to extract fractal parameters. This scheme was validated by accurate recovery of fractal parameters from simulated surfaces. The fractal dimension, the fractal roughness parameter and the fractal domain length were found for magnetic hard disk and silicon wafer surfaces.

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

Tribology challenges of modern magnetic hard disk drives

Wear ◽  
2001 ◽  
Vol 251 (1-12) ◽  
pp. 1124-1132 ◽  
Author(s):  
Andrei Khurshudov ◽  
Robert J. Waltman
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Magnetic Hard Disk

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.

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