scholarly journals Effect of laser heating on the smear behavior of PFPE lubricant films on magnetic disks in air and helium

2019 ◽  
Vol 1 ◽  
pp. 280-284
Author(s):  
N. Tagawa ◽  
K. Yakata ◽  
H. Tani ◽  
S. Koganezawa ◽  
R. Lu
Keyword(s):  
Laser Heating ◽  
Magnetic Disks ◽  
Pfpe Lubricant ◽  
Lubricant Films

scholarly journals Electric-Field-Assisted Dip-Coating for Ultra-Thin PFPE Lubricant Film on Magnetic Disks - Molecular Conformation Change by Electric Field -

2011 ◽  
Vol 6 (1) ◽  
pp. 40-44
Author(s):  
Hiroshi Tani ◽  
Masami Kubota ◽  
Masayuki Kanda ◽  
Motohiro Terao ◽  
Norio Tagawa
Keyword(s):  
Electric Field ◽  
Molecular Conformation ◽  
Dip Coating ◽  
Lubricant Film ◽  
Conformation Change ◽  
Magnetic Disks ◽  
Pfpe Lubricant

Depletion of Monolayer Liquid Lubricant Films Induced by Laser Heating in Thermally Assisted Magnetic Recording

2011 ◽  
Author(s):  
Norio Tagawa ◽  
Takao Miki ◽  
Hiroshi Tani
Keyword(s):  
Film Thickness ◽  
Laser Heating ◽  
Temperature Programmed Desorption ◽  
Lubricant Film ◽  
Lubricant Film Thickness ◽  
Lubricant Depletion ◽  
Liquid Lubricant ◽  
Lubricant Films ◽  
Temperature Programmed ◽  
Thermally Assisted Magnetic Recording

In this study, the lubricant depletion caused by laser heating was investigated for lubricant films with thicknesses greater than and less than one monolayer. The conventional lubricants Zdol2000 and Ztetrao12000 were used. It was found that the critical temperature at which lubricants start to deplete by laser heating strongly depends on the lubricant film thickness. To analyze the lubricant depletion mechanism, we carried out temperature programmed desorption (TPD) spectroscopy on the tested lubricant films. It was found that the lubricant depletion characteristics induced by laser heating could be explained using the experimental TPD spectroscopy results for the tested lubricant films. It was also found that the depletion mechanism involved the desorption or decomposition of the lubricant molecules that interacted with the diamond-like carbon thin films when the lubricant film thickness was less than one monolayer.

Direct Visualization of Molecularly Thin Lubricant Films on Magnetic Disks by Ellipsometric Microscopy With a White Light Source

2004 ◽  
Author(s):  
Kenji Fukuzawa ◽  
Akira Nakada ◽  
Yasunaga Mitsuya ◽  
Hedong Zhang
Keyword(s):  
Light Source ◽  
White Light ◽  
Theoretical Calculations ◽  
Direct Visualization ◽  
Magnetic Disks ◽  
White Light Source ◽  
Lubricant Films ◽  
Real Time Visualization ◽  
Molecularly Thin Lubricant ◽  
Conventional Laser

We demonstrated the direct visualization of molecularly thin lubricant films on magnetic disks with a thickness resolution of 0.1 nm by using an ellipsometric microscope with a white light source. It was able to reduce the optical interference noise that arises in conventional laser-based ellipsometric microscopes, and to provide a large SNR by a factor of about 6 compared to a laser-based ellipsometric microscope. The wavelength width should be given the first priority in designing a white light source ellipsometric microscope, and the width should be determined after considering the required coherence length and thickness resolution. Theoretical calculations indicate that a wavelength width of less than 10 nm can provide a thickness resolution of 0.1 nm. A white light source ellipsometric microscope can provide real-time visualization of a molecularly thin lubricant film with a thickness resolution of 0.1 mm, which is useful in investigating the kinetic behavior of molecularly thin lubricant films on magnetic disks.

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