Effects of Mobile and Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2005 ◽  
Vol 128 (1) ◽  
pp. 176-180 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant

Lubrication by an extremely thin film has become very important in micromachines, magnetic recording disks, and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that both mobile and bonded molecules exist on the disk surface, the bouncing vibration of the sliding ball can be reduced wide load range. In the case where only mobile or only bonded molecules exists, there is little effect on the bouncing vibration.

Effects of Mobile and Chemically Bonded Molecules of Molecularly Thin Lubricant Film on the Vibrational Stability of a Sliding Ball

2004 ◽  
Author(s):  
Kentaro Tanaka ◽  
Masahiro Kawaguchi ◽  
Takahisa Kato ◽  
Katsumi Iwamoto
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Direct Contact ◽  
Disk Surface ◽  
Lubricant Film ◽  
Load Range ◽  
Molecularly Thin Lubricant ◽  
The Stability

Lubrication by an extremely thin film has become very important in micro machines, magnetic recording disks and so on. Molecularly thin perfluoropolyether (PFPE) films are considered a good lubricant for these micro devices. When the thickness of the PFPE film is thinned to several nanometers, it is possible to assume that the film consists of mobile and chemically bonded molecules. In this paper, we investigated the role of these molecules from the viewpoint of the vibrational stability of the sliding ball with the disk surface. From experiments by the ball on disk type tribotester, it is found that chemically bonded molecules prevent direct contact between the slider and the disk surface. Furthermore, when mobile molecules exist on bonded molecules, the stability is improved in wide load range.

The role of stress-induced anisotropy in longitudinal thin film magnetic recording media

1996 ◽  
Vol 79 (8) ◽  
pp. 5342 ◽  
Author(s):  
C. A. Ross ◽  
M. E. Schabes ◽  
R. Ranjan ◽  
G. Bertero ◽  
T. Chen
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media ◽  
Induced Anisotropy ◽  
Stress Induced Anisotropy

The role of Ta and Pt in segregation within Co-Cr-Ta and Co-Cr-Pt thin film magnetic recording media

1996 ◽  
Vol 79 (8) ◽  
pp. 5345 ◽  
Author(s):  
K. M. Kemner ◽  
V. G. Harris ◽  
V. Chakarian ◽  
Y. U. Idzerda ◽  
W. T. Elam ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Recording Media ◽  
Magnetic Recording Media

Study on Lubricant Depletion Induced by Laser Heating in Thermally Assisted Magnetic Recording Systems: Effect of Lubricant Thickness

2009 ◽  
Author(s):  
Norio Tagawa ◽  
Hideki Andoh ◽  
Hiroshi Tani
Keyword(s):  
Film Thickness ◽  
Magnetic Recording ◽  
Laser Heating ◽  
Disk Surface ◽  
Lubricant Film ◽  
Stress Effect ◽  
Lubricant Film Thickness ◽  
Lubricant Depletion ◽  
Thermocapillary Stress ◽  
Thermally Assisted Magnetic Recording

In this study, fundamental research on lubricant depletion due to laser heating in thermally assisted magnetic recording was conducted. In particular, the effect of lubricant film thickness on lubricant depletion was investigated. The conventional lubricant Zdol2000 was used. As a result, it was found that the lubricant depletion characteristics due to laser heating depend largely on the lubricant film thickness. In addition, it was suggested that the lubricant depletion mechanism involves the evaporation of the mobile lubricant molecules, when the maximum attained temperature is not very high. Another suggested lubricant depletion mechanism involves the thermocapillary stress effect induced by the disk surface temperature gradient resulting from the non-uniformity of the laser spot intensity distribution.

scholarly journals Characterization by TOF-SIMS of the interface between a lubricant film and a carbon film on a thin-film magnetic recording disk.

2000 ◽  
Vol 49 (4) ◽  
pp. 251-256 ◽  
Author(s):  
Tetsuo AMEMIYA ◽  
Nobuyuki YOSHINO ◽  
Yoshio UMEDA ◽  
Yoshimasa NIHEI
Keyword(s):  
Thin Film ◽  
Magnetic Recording ◽  
Carbon Film ◽  
Lubricant Film ◽  
Tof Sims

Transmission Electron Microscopy studies of texture of Cr underlayer of magnetic recording hard disk

1991 ◽  
Vol 49 ◽  
pp. 580-581
Author(s):  
L. Tang ◽  
G. Thomas ◽  
M. R. Khan ◽  
S. L. Duan
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Transmission Electron Microscopy ◽  
Magnetic Recording ◽  
Magnetic Thin Films ◽  
Magnetic Films ◽  
Substrate Bias ◽  
Epitaxial Relationship ◽  
Transmission Electron

Cr thin films are often used as underlayers for Co alloy magnetic thin films, such as Co1, CoNi2, and CoNiCr3, for high density longitudinal magnetic recording. It is belived that the role of the Cr underlayer is to control the growth and texture of the Co alloy magnetic thin films, and, then, to increase the in plane coercivity of the films. Although many epitaxial relationship between the Cr underlayer and the magnetic films, such as ﹛1010﹜Co/ {110﹜Cr4, ﹛2110﹜Co/ ﹛001﹜Cr5, ﹛0002﹜Co/﹛110﹜Cr6, have been suggested and appear to be related to the Cr thickness, the texture of the Cr underlayer itself is still not understood very well. In this study, the texture of a 2000 Å thick Cr underlayer on Nip/Al substrate for thin films of (Co75Ni25)1-xTix dc-sputtered with - 200 V substrate bias is investigated by electron microscopy.

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