Effects of end groups on the spreading characteristics of molecularly thin liquid lubricant films in hard disk drives

2006 ◽  
Author(s):  
N. Tagawa ◽  
M. Korenaga ◽  
A. Mori ◽  
N. Kobayashi ◽  
M. Ikegami
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Liquid Lubricant ◽  
End Groups ◽  
Lubricant Films

Effects of End Groups on the Spreading Characteristics of Molecularly Thin Liquid Lubricant Films in Hard Disk Drives

2007 ◽  
Vol 43 (9) ◽  
pp. 3705-3709 ◽  
Author(s):  
N. Tagawa ◽  
M. Korenaga ◽  
A. Mori ◽  
N. Kobayashi ◽  
M. Ikegami
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Liquid Lubricant ◽  
End Groups ◽  
Lubricant Films

Effect of Temperature on the Spreading Characteristics of Molecularly Thin Liquid Lubricant Films in Hard Disk Drives

2008 ◽  
Author(s):  
Norio Tagawa ◽  
Kenta Mori ◽  
Atsunobu Mori ◽  
Masako Ikegami
Keyword(s):  
Diffusion Coefficient ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Effect Of Temperature ◽  
Disk Drives ◽  
Liquid Lubricant ◽  
Quantitative Correlation ◽  
Lubricant Films ◽  
Apparent Diffusion ◽  
Mobile Fraction

In this study, the effect of temperature on the spreading characteristics of ultra-thin liquid lubricant films in hard disk drives (HDD) was investigated by using three types of lubricants, namely, Zdol2000, Ztetraol2000, and A20H2000. The apparent diffusion coefficient of individual lubricants was evaluated and compared by varying the temperature of disk substrates. As a result, it was found that the mobility of each lubricant increases with the temperature. However, the rate of mobility increase is different for each lubricant, depending on the lubricant material. Furthermore, there exists no quantitative correlation between the mobility increase for ultra-thin liquid lubricant films and the viscosity decrease in bulk lubricant materials due to a rise in the temperature. It was also found that among the test lubricants, A20H2000 has the highest robustness for temperature change. In addition, it could be observed that the evaporation of the mobile fraction of lubricants occurred remarkably over a temperature range of 50– 80 °C.

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