Numerical Simulation of the Head/Disk Interface for Bit Patterned Media

Talke, Frank E.

doi:10.1109/tmag.2009.2029412

Cited by 6 publications

(4 citation statements)

References 35 publications

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“…Residual topography left behind by the BPM manufacturing process challenges air bearing designers to design a slider that can better follow residual topography [34,64,65] as well as media manufacturers to have a uniform overcoat and lubricant coverage of the media surface. Moreover, the residual media topography could lead to excessive induced lubricant roughness on the microscale (lubricant moguls and ripples) unless a new lubricant can be designed.…”

Section: Tribology and Hdi Challenges For Alternate Technologiesmentioning

confidence: 99%

The Head-Disk Interface Roadmap to an Areal Density of Tbit/in²

Marchon

Pitchford

Hsia

et al. 2013

Advances in Tribology

100

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This paper reviews the state of the head-disk interface (HDI) technology, and more particularly the head-medium spacing (HMS), for today's and future hard-disk drives. Current storage areal density on a disk surface is fast approaching the one terabit per square inch mark, although the compound annual growth rate has reduced considerably from ∼100%/annum in the late 1990s to 20-30% today. This rate is now lower than the historical, Moore's law equivalent of ∼40%/annum. A necessary enabler to a high areal density is the HMS, or the distance from the bottom of the read sensor on the flying head to the top of the magnetic medium on the rotating disk. This paper describes the various components of the HMS and various scenarios and challenges on how to achieve a goal of 4.0-4.5 nm for the 4 Tbit/in 2 density point. Special considerations will also be given to the implication of disruptive technologies such as sealing the drive in an inert atmosphere and novel recording schemes such as bit patterned media and heat assisted magnetic recording.

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Section: Tribology and Hdi Challenges For Alternate Technologiesmentioning

confidence: 99%

The Head-Disk Interface Roadmap to an Areal Density of Tbit/in²

Marchon

Pitchford

Hsia

et al. 2013

Advances in Tribology

100

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“…Such illustrations incorporate piston ring, 8,9 sliding bearing, 10 cylinder liner, 11 mechanical and lip seal, 12 hard disk, etc. 13 In the machine elements, the engineered textures are used to improve the tribological performance. 14,15 New technologies such as chemical etching, 16 dressing technique, and laser surface texturing 18 allow forming controlled micro-geometries in any desired shapes on surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Such illustrations incorporate piston ring, 8,9 sliding bearing, 10 cylinder liner, 11 mechanical and lip seal, 12 hard disk, etc. 13…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional thermohydrodynamic investigation on the micro-groove textures in the main bearing of internal combustion engine for tribological performances

Ahmadkhah

Kakaee

2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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A three-dimensional thermohydrodynamic numerical simulation study was used to investigate the impact of the micro-groove surface texturing on the tribological performances in the main bearing of the internal combustion engine. For this purpose, various number of grooves and groove height to the bearing surface were applied to determine the optimal texture surface parameters by comparing the load-carrying capacity and friction force in the engine main bearing. In the multiphysics numerical model, the three-dimensional Navier–Stokes equation was employed considering the cavitation mechanism based on the Elrod method in the solution. Using the transverse grooves on the bearing surface altered the cavitation response and film reformation. To validate the use of the current numerical model for analyzing the bearings, the obtained results were compared with those of the published theoretical papers, where a good agreement was obtained. The bearing performance was studied in thermal interface conditions to find the optimal set textures parameters that gave minimum fiction force with minimum loss in load-carrying capacity. The bearing with the optimal micro-groove texture parameter showed a reduction in friction (around 16%) with the minimum reduction in load-carrying capacity (around 6%) and the maximum reduction of the flow work (around 15%) compared with the untextured bearing surface. This paper focuses on the thermohydrodynamic investigation with a combination of thermal effects of the fluid film in the textured bearing. Meanwhile, the heat transfer characteristic, temperature distribution of solid bodies, and convection heat transfer coefficient in the contact surfaces of the textured bearing were investigated. The proposed multiphysics numerical model can be widely used for predicting the optimal texture surface parameters in different engineering systems modeling. Moreover, using the three-dimensional-based numerical model is more cost-effective compared with the experimental evaluation of the textured surface.

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“…To numerically simulate this situation, the mesh size generated on the air bearing surface of a magnetic recording slider should be around 2 nm or less to accurately capture the geometry of the bit pattern on the disk surface (10)(11)(12) . Due to the numerical limitations of present day air bearing simulation codes, great difficulties are encountered in the simulation bit patterned media.…”

Section: Introductionmentioning

confidence: 99%