Effect of Viscoelasticity on Lubricant Behavior Under Heat-Assisted Magnetic Recording Conditions

Sarabi, Soroush; Bogy, David B.

doi:10.1007/s11249-017-0979-5

Cited by 8 publications

(3 citation statements)

References 27 publications

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“…In HAMR, a higher bonded ratio is desirable to prevent evaporation and decomposition of the lubricant due to laser heating. For this reason, Sarabi et al [27] considered the lubricant film as a uniform viscoelastic film and employed the lubrication equation for viscoelastic lubrication films presented by Tichy [28] to analyze the evaporation caused by laser spots and the replenishment characteristics of their depleted marks. In addition, Sakhalkar et al [29,30] analyzed the mechanism of transfer of lubricant evaporated from the disk surface to the head surface in HAMR recording using the viscoelastic film equation considering the temperature characteristics of tension and viscosity, and clarified the difference in transfer rate and transfer amount between Z-Tetraol and Z-dol, and the influences of various parameters.…”

Section: Diffusion Characteristics Of Sub-nanometer Lubricant Filmmentioning

confidence: 99%

Physics of the Sub-Monolayer Lubricant in the Head-Disk Interface

Ono

2024

Lubricants

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This review presents a series of studies which have demonstrated that the diffusion characteristics of rarefied mobile lubricant films used in modern magnetic disks can be evaluated by a novel diffusion theory based on continuum mechanics, and that the meniscus force of the rarefied film is the major interaction force at the head-disk interface. The limitations of the conventional diffusion and disjoining pressure equations are first shown, and diffusion and disjoining pressure equations for rarefied liquid films are proposed, showing that the diffusion coefficient is in good agreement with the experiment. The experiment, in which glass spheres with radii of 1 and 2 mm collided with magnetic disks of different film thicknesses, showed that attraction similar to the pull-off forces of a static meniscus was measured only at the separation. Furthermore, mathematical analysis of the elastic meniscus contact between a sphere and a plane with a submonolayer liquid film showed that the maximum adhesion force is equal to the meniscus pull-off force and that the contact characteristics become similar to those of the JKR theory as the liquid film thickness decreases. A basic physical model of submonolayer liquid film is also proposed to justify the continuum mathematical equations.

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Section: Diffusion Characteristics Of Sub-nanometer Lubricant Filmmentioning

confidence: 99%

Physics of the Sub-Monolayer Lubricant in the Head-Disk Interface

Ono

2024

Lubricants

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“…There are some example experiments that have explored the contact behavior between sliders and disks [4][5][6][7][8][9]. Itoh et al [4] and Zeng et al [7] studied the optimization and reliability design of contact recording, and the dynamical contacts were additionally investigated.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Slider Configuration on Lubricant Depletion at the Slider/Disk Contact Interface

Chen,

Zhou,

Tang

2024

Lubricants

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With decreasing clearance between the protrusion of a slider and a disk interface, there is a higher likelihood of contact occurring during shock or vibration experienced by hard disk drives (HDDs), which may induce lubricant depletion. Based on the molecular dynamics (MD) model of perfluoropolyether lubricant with a coarse-grained beads spring approach, we compared the slider configurations’ influence on the lubricant transfer volume quantitatively. By further investigating the parameters of the cylindrical asperities, including the width and depth, as well as considering the asperity amounts of the slider, we successfully observed the lubricant depletion process during slider and disk contact. The results demonstrate that the penetration depth was reduced as the asperity amount increased, mainly owing to the increased contact area between the surfaces. The decreasing depth of the asperity and the increasing width of the asperity helped to reduce the depletion volume. In addition, the utilization of a cylindrical slider configuration can contribute to a reduction in lubricant depletion resulting from contact between the head and disk.

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“…This method is highly popular and conventional for the simulation of the problems with low-pressure condition. Hence, numerous scholars and scientists [31][32][33][34][35][36][37][38][39][40] applied this for the simulation of scientific and engineering problems.…”

Section: Introductionmentioning

confidence: 99%

Application of Knudsen Force for Development of Modern Micro Gas Sensors

Gerdroodbary¹

2020

Gas Sensors

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Development of new simple gas sensor is highly significant due to its various industrial applications. In this chapter, comprehensive studies on the new micro gas sensor of Micro In-plane Knudsen Radiometric Actuator (MIKRA) are done to evaluate the performance of its technique on the detection of gas. This new micro gas sensor works by the radiometric phenomena, which occurs due to temperature difference in rarefied gas. In order to simulate this micro gas sensor, direct simulation Mont Carlo (DSMC) is recognized as a reliable method. This study highly focused on the main mechanisms of the flow feature and force generation in low-pressure domain. In order to study this micro gas sensor, comprehensive numerical results are thoroughly investigated and the effects of primary factors and parameters are revealed. In addition, the main details of computational approach for the simulation of this micro gas sensor are fully presented. Finally, the performance of this sensor in various operating conditions is explained and main findings are discussed.

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Effect of Viscoelasticity on Lubricant Behavior Under Heat-Assisted Magnetic Recording Conditions

Cited by 8 publications

References 27 publications

Physics of the Sub-Monolayer Lubricant in the Head-Disk Interface

Physics of the Sub-Monolayer Lubricant in the Head-Disk Interface

The Effect of Slider Configuration on Lubricant Depletion at the Slider/Disk Contact Interface

Application of Knudsen Force for Development of Modern Micro Gas Sensors

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