Spreading characteristics of cyclotriphosphazine-terminated perfluoropolyether films on carbon surfaces

Tagawa, Norio; Tateyama, Tadao; Mori, Atsunobu; Kobayashi, N.; Fujii, Yasuhito; Ikegami, Masako

doi:10.1109/tmag.2003.816431

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…In addition, it can be seen that the film thickness drops to approximately 1.5 nm and no further thinning is observed in these cases. It is interesting that 1.5 nm corresponds to the thickness of the first complete monolayer for Zdol2000, as evaluated from the spreading characteristics of Zdol2000 [7]. Regarding the lubricant film thickness profiles in the R direction, it is seen that there are lubricant film thickness peaks at the edge of the contact slider pad on the disk.…”

Section: Lubricant Film Thickness Profiles For Zdol2000mentioning

confidence: 95%

“…The initial film thickness was controlled by adjusting the draw rate of the disk to 3 mm/s. The spreading characteristics of the test lubricants have already been studied and it is found that the mobility of A20H lubricants is lower than that of conventional Zdol [7].…”

Section: Methodsmentioning

confidence: 99%

“…In this study, these lubricant profiles were measured collectively after the three contact experiments, which were carried out by lowering the disk velocity from 1.4 to 1.0 m/s, were completed. Because the monolayer film thickness of Zdol2000 is approximately 1.5 nm [7], this initial lubricant film thickness seems to be less than one monolayer. From figure 5, it is evident that the lubricant film thickness remains almost constant.…”

Section: Lubricant Film Thickness Profiles For Zdol2000mentioning

confidence: 99%

“…The lubricant film thickness profiles along the h direction as well as the R direction, before and after each test at approximately 1 nm initial lubricant film thickness, are shown in figure 7. Because the monolayer film thickness of A20H2000 is approximately 1.6 nm [7], this initial lubricant film thickness also seems to be less than one monolayer. From this figure, it can be seen that the lubricant film thickness profiles do not change.…”

Section: Lubricant Film Thickness Profiles For A20h2000mentioning

confidence: 99%

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Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives

Tagawa

Mori

2005

Tribol Lett

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In this paper, we describe the behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives. In the experiments, the ultrathin liquid lubricant film behavior is investigated using Zdol and cyclotriphosphazene-terminated PFPE lubricant which have different end groups as a function of lubricant film thickness. The disks are examined with a scanning microellipsometer before and after contact slider experiments. It is found that the lubricant film thickness profiles almost do not change, when the lubricant film thickness is less than one monolayer. It can also be observed that lubricant film thickness instability due to dewetting occurs as a result of slider-disk contacts for the tested lubricants and the films undergo spontaneous redistributions, resulting in significantly nonuniform film thickness profiles, when the lubricant film thickness is thicker than one monolayer. In addition, it is found that the observed behavior of ultrathin liquid lubricant films for cyclotriphosphazine-terminated PFPE lubricant contrasts markedly with that for Zdol. The difference between cyclotriphosphazene-terminated PFPE lubricant and Zdol is only the functional end group. Therefore, it may be concluded that their unstable lubricant behavior depends on the chemical structure of functional end groups.

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Section: Lubricant Film Thickness Profiles For Zdol2000mentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

Section: Lubricant Film Thickness Profiles For Zdol2000mentioning

confidence: 99%

Section: Lubricant Film Thickness Profiles For A20h2000mentioning

confidence: 99%

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Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives

Tagawa

Mori

2005

Tribol Lett

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Conformation and Fundamental Properties of Novel Lubricant TA-30 for Near Contact Magnetic Recording

Tagawa

Tani

2010

Tribol Lett

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A novel perfluoropolyether (PFPE) lubricant called TA-30 has been developed recently. We investigate the conformation of TA-30 on diamond-like carbon (DLC) thin films, by attempting the direct observation of a lubricant film by atomic force microscopy (AFM) using a fluoride probe. We investigate the fundamental properties of a TA-30 lubricant film, such as its spreading characteristics, and the film thickness dependence of surface energy. Considering these experimental results, we conclude that the conformation of TA-30 is considerably different from that of conventional Z-tetraol2000 whose molecular height is 1.7 nm and which was adsorbed on the DLC surface with the random coil. The TA-30 molecules are adsorbed rigidly to the DLC surface with double layers. The thickness of the first TA-30 layer is *0.9 nm (similar to diameter of the PFPE backbone) and that of the second layer from the DLC surface is 1.4 nm. Since TA-30 has a lower film thickness than Z-tetraol2000 on the DLC surface, it can have two layers, even if the film thickness is approximately of the order of 1 nm, whereas Z-tetraol2000 does not cover the DLC surface and does not form the complete first layer. In addition, we conduct slider touchdown and takeoff hysteresis tests by using TA-30 and Z-tetraol2000. It is confirmed that the use of TA-30 can improve the head-disk interface (HDI) reliability at lowfly-height conditions.

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Effects of ultra-thin liquid lubricant films on contact slider dynamics in hard-disk drives

Tagawa

Tashiro

Mori

2007

Tribology International

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Spreading characteristics of cyclotriphosphazine-terminated perfluoropolyether films on carbon surfaces

Cited by 8 publications

References 6 publications

Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives

Behavior of ultrathin liquid lubricant films for contact sliders in hard disk drives

Conformation and Fundamental Properties of Novel Lubricant TA-30 for Near Contact Magnetic Recording

Effects of ultra-thin liquid lubricant films on contact slider dynamics in hard-disk drives

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