Composition and thickness distribution of carbon overcoat films on thin film magnetic disks studied with surface reflectance analyzers

1999 ◽  
Author(s):  
Gerard H. Vurens ◽  
David Klein
Keyword(s):  
Thin Film ◽  
Thickness Distribution ◽  
Surface Reflectance ◽  
Carbon Overcoat ◽  
Magnetic Disks

Tribological implications of solvents in dip-coating lubrication of thin film magnetic disks

1996 ◽  
Vol 32 (5) ◽  
pp. 3699-3701 ◽  
Author(s):  
C. Gao ◽  
Y.C. Lee ◽  
J. Chao ◽  
M. Russak
Keyword(s):  
Thin Film ◽  
Dip Coating ◽  
Magnetic Disks

Formation of Lubricant “Sierra” at Boundary Between PFPE Solution Dipped and Un-Dipped Zones Over DLC Coated Magnetic Disks

2002 ◽  
Author(s):  
Yasunaga Mitsuya ◽  
Keiko Goto ◽  
Yoshihiro Hayashi
Keyword(s):  
Film Thickness ◽  
Thickness Distribution ◽  
Dip Coating ◽  
Boundary Line ◽  
Boundary Area ◽  
Magnetic Disks ◽  
Coating Method ◽  
Formation Conditions ◽  
Dip Coating Method ◽  
Multiplex Bead

An unstable phenomenon arising at the boundary between PFPE solution dipped and un-dipped zones over DLC coated magnetic disks has been studied. The formation conditions of a ridge of lubricant, or “sierra,” at this boundary and the structure of the “sierra” were clarified. Lubricant film having a step-shaped boundary was first formed by the halfway dip-coating method, and film thickness distribution was then measured around the boundary area. It was found that the film thickness was uniform over the entire lubricated area for a higher speed of withdrawing the disk from the lubricant solution and decreased linearly when the withdrawing speed was lowered. However, the “sierra” structure of the lubricant suddenly formed along the boundary line when the withdrawing speed was further decreased to less than a specified value of around 1 mm/s. The “sierra” was less likely to form for a lower dilution and a longer elapsed time after making the lubricant solution. It was also revealed that, along the ridgeline of the “sierra,” peaks formed periodically and the peak feet propagated in the direction perpendicular to the boundary, forming convex fronts and leaving multiplex bead chains of lubricant accumulations inside the convex.

Mechanical property measurements of thin-film carbon overcoat on recording media towards 1Tbit∕in2

2006 ◽  
Vol 99 (8) ◽  
pp. 08G906 ◽  
Author(s):  
Ki Myung Lee ◽  
Chang-Dong Yeo ◽  
Andreas A. Polycarpou
Keyword(s):  
Thin Film ◽  
Mechanical Property ◽  
Recording Media ◽  
Carbon Overcoat

Effect of Sputtering Process Conditions on Microstructure and Mechanical Properties of Pt-Fe Nano Film

2011 ◽  
Vol 675-677 ◽  
pp. 655-658 ◽  
Author(s):  
S. Ishiguro ◽  
R. Ogatsu ◽  
T. Inami ◽  
T. Nakano ◽  
Dong Ying Ju ◽  
...  
Keyword(s):  
Thin Film ◽  
Mechanical Properties ◽  
Hard Disk Drive ◽  
Disk Drive ◽  
Process Conditions ◽  
Next Generation ◽  
Recording Medium ◽  
Micro Structure ◽  
Magnetic Disks ◽  
High Density Magnetic Recording

One of the vertical magnetic recordings medium materials of the hard disk drive (HDD) is a Pt-Fe thin film. The development of ultra-high density magnetic recording medium in next generation is expected the magnetic disks such as HDD with capacity enlargement of the data. In order to study effectiveness of the proposed sputtering method, we evaluated micro structure, magnetic and the mechanical properties of a Pt-Fe thin film by some sputtering process conditions. From research results, effect sputtering conditions on micro-structure and mechanical properties of Pt-Fe nano film are verified.

Transparent Pin Wear Test on Thin-Film Magnetic Disk

1995 ◽  
Vol 117 (2) ◽  
pp. 297-301 ◽  
Author(s):  
Youichi Kawakubo ◽  
Yotsuo Yahisa
Keyword(s):  
Thin Film ◽  
Wear Debris ◽  
Wear Test ◽  
Video Camera ◽  
Video Monitoring ◽  
Friction Measurement ◽  
Magnetic Disks ◽  
Bulk Hardness ◽  
Pin On Disk ◽  
Wear Tests

Pin-on-disk wear tests on thin-film magnetic disks were performed using transparent materials. Quartz glass (QG), transparent zirconia (TZ), sapphire (SA), and synthesized diamond (DI) were used as pin materials. In addition to friction, sliding condition and pin wear were continuously monitored with video camera. Simultaneous friction measurement and video monitoring showed that friction dropped when wear debris intruded between pin and disk surfaces. Pin wear, from the measured diameter of wear scar on spherical pins, increased in the order of DI, SA, QG, and TZ. This order of pin wear does not coincide with that of the pin bulk hardness. Disk lifetime increased in the order of TZ, QG, SA, and DI, and the smaller the pin wear, the longer the disk lifetime.

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