Effect of Ultra-Thin Liquid Lubricant Films on Dynamics of Nano-Spacing Flying Head Sliders in Hard Disk Drives

Tagawa, Norio; Yoshioka, Noritaka; Mori, Atsunobu

doi:10.1115/1.1739409

Cited by 8 publications

(3 citation statements)

References 6 publications

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“…This may be because the mobility of A20H lubricants is less than Zdol. In fact, the lubricant mobile layer or lubricant mobility suppresses the slider vibration when the slider contacts with the disk [2]. Fig.1.…”

Section: Wtc2005-63622mentioning

confidence: 98%

Effects of Molecularly Thin Lubricant Films on Slider Touch-Down and Take-Off Hysteresis Behavior in Hard Disk Drives

Tagawa

Sendo

Mori

2005

World Tribology Congress III, Volume 1

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This paper describes the effects of molecularly thin liquid lubricant films on slider hysteresis phenomena of touch-down and take-off process in hard disk drives. In the experiments, the tested lubricants were conventional Zdol and novel cyclotriphosphazene-terminated PFPE lubricant (A20H lubricant) with different molecular weight. As a result, it is found that the difference between the touch-down velocity and take-off one (hysteresis behavior) for novel A20H lubricant film is larger than that for Zdol. The LDV RMS values for novel lubricant, which indicate the slider bouncing vibration during the slider-lubricant contact, are also larger than that for Zdol. The effects of lubricant film thickness and molecular weight on slider hysteresis behavior as well as slider bouncing vibration are also clarified. In addition, the replenishment performances of test lubricants for depleted tracks due to slider touch down contact are investigated and discussed.

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Section: Wtc2005-63622mentioning

confidence: 98%

Effects of Molecularly Thin Lubricant Films on Slider Touch-Down and Take-Off Hysteresis Behavior in Hard Disk Drives

Tagawa

Sendo

Mori

2005

World Tribology Congress III, Volume 1

Self Cite

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“…Most recently, the effects of an ultrathin liquid lubricant film on air bearing dynamics and flyability in a spacing of less than 10 nm has been studied. As a result, it was found that the flying height at which sliderlubricant contact occurs depends on the mobile lubricant film thickness under the conditions that the total lubricant film thicknesses are the same and the lubricant bonded ratios are different [6]. Thus far, however, research on slider-lubricant interactions for contact sliders has not been carried out, in spite of the above-mentioned investigations.…”

Section: Introductionmentioning

confidence: 96%

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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“…The magnitude of slider vibration during contact for the Z-DOL was also found to be smaller than the A20H's. It is because Z-DOL lubricant has a higher mobility than A20H lubricant which has better slider vibration suppression during event of any slider-disk contact [18].…”

Section: Intermolecular Force Flying Height Hysteresis and Interfacementioning

confidence: 99%

Interface stability study towards ultra-high density magnetic recording

Tan¹

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Experimental results of surface interaction forces study 4.0 Introduction 4.1 Harmonic vibration methodology and sample preparation 4.1.1 Basic of Harmonic Vibration methodology 4.1.2 Sample preparation 4.1.3. Using harmonic vibration method for contact potential measurement 4.1.4 Primary characteristics of 2nd harmonic vibration on V 2 ac 4.2 Characteristics studies of contact potential at the slider-disk interface 4.2.1 Influence of different rotational speed on contact potential 4.2.2 Influence of different lubricant thickness on contact potential 4.2.3 Influence of slider's flying duration on contact potential 4.2.4 Influence of slider-disk contact on contact potential 4.2.4 Influence of different lubricants with different functional end group 4.2 Characteristics studies of 2nd Harmonic Vibration at sliderdisk interface 4.2.1 Influences of air bearing stiffness on 2nd harmonic vibration. 4.2.2 Influence of lube-induced meniscus on 2nd harmonic vibration amplitude 4.2.3 Influences of electro-spacing on 2nd harmonic vibration 4.3 Relative ranking of surface interaction forces 4.3.1 Test to determine near asperities contact level slider-disk spacing 4.3.2 Experimental method to determine relative ranking of surface interaction forces 4.3.3 Analysis of the experimental study 4.4 Summary CHAPTER 5..

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Effect of Ultra-Thin Liquid Lubricant Films on Dynamics of Nano-Spacing Flying Head Sliders in Hard Disk Drives

Cited by 8 publications

References 6 publications

Effects of Molecularly Thin Lubricant Films on Slider Touch-Down and Take-Off Hysteresis Behavior in Hard Disk Drives

Effects of Molecularly Thin Lubricant Films on Slider Touch-Down and Take-Off Hysteresis Behavior in Hard Disk Drives

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

Interface stability study towards ultra-high density magnetic recording

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