Numerical Simulation of the Head/Disk Interface for Patterned Media

Murthy, Aravind N.; Duwensee, Maik; Talke, Frank E.

doi:10.1007/s11249-009-9570-z

Cited by 9 publications

(3 citation statements)

References 21 publications

(28 reference statements)

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“…6 some nonlinearity is observed, especially for higher pattern height. This nonlinear effect was also obtained by the direct simulation (Murthy et al 2010) and it was explained as: a change of the bit pattern diameter leads to a change of the pattern profile not only in the slider's width direction but also the slider's length direction so that the side flow is prevalent in this case. However, for small pattern height, the flying height change can still be considered as a linear function of the recess area ratio.…”

Section: Model Techniquesmentioning

confidence: 54%

“…This paper showed that a mesh size to bit diameter ratio smaller than 1:6 required to guarantee a sufficiently high resolution of the air bearing pressure. To reduce the numerical complexity of the direct method, Murthy et al (2010) transferred the pattern from the disk surface to the slider surface and limited the region of the pattern to the center trailing pad of the slider. All the above researches showed the effect of the pattern height and pattern area ratio on the slider's flying height.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of air bearing sliders flying on partially planarized bit patterned media in hard disk drives

Bogy

2011

Microsyst Technol

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Bit patterned media (BPM) recording is one of the promising techniques for future disk drives in order to increase the areal density above 1 Tbit/in 2 . However, the BPM can change the topography of the disk surface and thus have an effect on the flying characteristics of the air bearing sliders. So achieving a stable flying attitude at the hard disk interface (HDI) becomes one of the main considerations for BPM. In this paper, we apply three methods (complete homogenization, Taylor expansion homogenization and averaging) to solve this BPM problem and finally choose the Taylor expansion homogenization method to investigate the slider's flying attitude on partially planarized patterned media as well as at transitions over different pattern types such as might occur at boundaries between data and servo sections.

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Section: Model Techniquesmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Dynamics of air bearing sliders flying on partially planarized bit patterned media in hard disk drives

Bogy

2011

Microsyst Technol

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“…The Reynolds equation satisfactorily reflects hydrodynamic lubrication effects for a broad range of interface parameters, and its solution delivers the pressure, which allows the interface to carry a normal load . Based on the Reynolds equation, a number of recent studies have directly concentrated on the optimization of the mesoscopic interface geometry by fully or partially endowing the surface typically with pillar‐type features that have circular or square cross‐sections . However, a homogenization‐based scheme that concentrates on the microscale through the design of micro‐textures with the purpose of attaining a prescribed macroscopic interface response appears not to have been addressed in the literature.…”

Section: Introductionmentioning

confidence: 99%

Homogenization‐based design of surface textures in hydrodynamic lubrication

Waseem

Temizer

Kato

et al. 2016

Numerical Meth Engineering

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SUMMARYAn optimization framework is developed for surface texture design in hydrodynamic lubrication. The microscopic model of the lubrication interface is based on the Reynolds equation, and the macroscopic response is characterized through homogenization. The microscale setting assumes a unilateral periodic texture but implicitly accounts for the bilateral motion of the surfaces. The surface texture in a unit cell is described indirectly through the film thickness, which is allowed to vary between prescribed minimum and maximum values according to a morphology variable distribution that is obtained through the filtering of a design variable. The design and morphology variables are discretized using either element-wise constant values or through first-order elements. In addition to sharp textures, which are characterized by pillars and holes that induce sudden transitions between extreme film thickness values, the framework can also attain a variety of non-standard smoothly varying surface textures with a macroscopically isotropic or anisotropic response.

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Static and dynamic flying characteristics of a slider on bit-patterned media (dynamic responses based on frequency domain analysis)

2012

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Numerical Simulation of the Head/Disk Interface for Patterned Media

Abstract: The use of patterned media is a new approach proposed to extend the recording densities of hard disk drives beyond 1 Tb/in. 2

Cited by 9 publications

References 21 publications

Dynamics of air bearing sliders flying on partially planarized bit patterned media in hard disk drives

Dynamics of air bearing sliders flying on partially planarized bit patterned media in hard disk drives

Homogenization‐based design of surface textures in hydrodynamic lubrication

Static and dynamic flying characteristics of a slider on bit-patterned media (dynamic responses based on frequency domain analysis)

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