5714 UV Irradiation Effects on Spreading Characteristics of Molecularly Thin Lubricant Films Coated over Magnetic Disks : Influence of Molecular End Groups

2006 ◽  
Vol 2006.5 (0) ◽  
pp. 627-628
Author(s):  
Yuki KUDO ◽  
Hedong ZHANG ◽  
Yasunaga MITSUYA ◽  
Kenji FUKUZAWA
Keyword(s):  
Uv Irradiation ◽  
Irradiation Effects ◽  
Magnetic Disks ◽  
End Groups ◽  
Lubricant Films ◽  
Molecularly Thin Lubricant

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.

A Simulation Method for Spreading Dynamics of Molecularly Thin Lubricant Films on Magnetic Disks Using Bead-Spring Model

2005 ◽  
Author(s):  
Yoichi Tagaya ◽  
Yasunaga Mitsuya ◽  
Susumu Ogata ◽  
Hedong Zhang ◽  
Kenji Fukuzawa
Keyword(s):  
Molecular Motion ◽  
Simulation Method ◽  
Precipitation Method ◽  
Magnetic Disks ◽  
Rouse Model ◽  
Spreading Dynamics ◽  
Lubricant Films ◽  
Initial Molecule ◽  
Molecularly Thin Lubricant ◽  
And Diffusion

An effective simulation technique for describing the spreading properties of molecularly thin lubricant films on magnetic disks has been developed. We propose a molecular precipitation method that can simulate initial molecule arrangement of the films dip-coated onto the disks. Reptation and Rouse models as the model of the molecular motion, and molecular insertion and molecular precipitation methods as the method for putting molecules in initial positions were compared. From the results of the spreading profiles and diffusion coefficients, it has been revealed that the molecular precipitation method combined with the Rouse model is effective in simulating the spreading of the lubricant films.

Thickness and adhesion force distributions in the spreading region of molecularly thin lubricant films on magnetic disks

2005 ◽  
Vol 41 (10) ◽  
pp. 3001-3003
Author(s):  
Hedong Zhang ◽  
Y. Mitsuya ◽  
E. Nakai ◽  
K. Goto ◽  
K. Fukuzawa
Keyword(s):  
Adhesion Force ◽  
Magnetic Disks ◽  
Lubricant Films ◽  
Molecularly Thin Lubricant

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

2004 ◽  
Vol 126 (4) ◽  
pp. 755-760 ◽  
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 larger SNR by a factor of about 6 compared to a laser-based ellipsometric microscope. The wavelength width should be given 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 nm, which is useful in investigating the kinetic behavior of molecularly thin lubricant films on magnetic disks.

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