Investigation of Flying-Height Stability of Thermal Fly-Height Control Sliders in Lubricant or Solid Contact with Roughness

Zheng, Jinglin; Bogy, David B.

doi:10.1007/s11249-010-9607-3

Cited by 44 publications

(12 citation statements)

References 15 publications

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“…TFC of magnetic recording slider has been investigated by many authors in the past [4][5][6][7][8][9][10][11][12]. Most of the studies in this area are based on the model by Zhang and Bogy [8].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Nanoscale Heat Transfer and Flying Characteristics in Thermal Flying Height Control Sliders Considering Near-Field Radiation

Zheng

Talke

2015

Tribol Lett

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Nanoscale heat transfer at the head/disk interface is investigated for thermal flying height control sliders in hard disk drives. Near-field radiation effects due to evanescent photo tunneling are considered in addition to thermal conduction. It is found that the maximum value of the heat flux due to near-field thermal radiation is comparable to that from heat conduction. Near-field thermal radiation is shown to cause a decrease in the thermal protrusion, resulting in a larger flying height than predicted for the case that near-field radiation is neglected. Results from this study are useful for the design of high-performance disk drives.

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Section: Introductionmentioning

confidence: 99%

Investigation of Nanoscale Heat Transfer and Flying Characteristics in Thermal Flying Height Control Sliders Considering Near-Field Radiation

Zheng

Talke

2015

Tribol Lett

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“…A sub-boundary lubrication model is implemented in this dynamic solver to model the interfacial forces (contact, adhesion, friction, electrostatic) arising at the HDI at extremely small clearances [16], [17]. These forces are calculated based on a multi-asperity approach: the surface is assumed to have asperities with an areal density, uniform radius of curvature, and statistically distributed heights.…”

Section: Numerical Modelmentioning

confidence: 99%

Numerical Simulation of Touchdown Dynamics of Thermal Flying-Height Control Sliders

Zheng

Bogy

2012

IEEE Trans. Magn.

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With the advent of thermal flying-height control (TFC) technology the physical spacing in magnetic hard disk drives is now reduced to sub-1 nm. At this spacing the tribological flyability and reliability become critical issues for the performance of the read-write head. In this paper a numerical approach is applied to study the touchdown dynamics of TFC sliders by expanding a 3-degree-of-freedom slider dynamics model to a 250-degree-of-freedom head-gimbal assembly dynamics model and considering several significant tribological effects at this ultra-low clearance (adhesion, tribo-charge, friction, contact, etc.). The simulation results show that the slider's vibration amplitude increases substantially at the beginning of touchdown, and it gets suppressed with further reduction in flying height. Analysis in the frequency domain shows the excitation of the second air-bearing pitch mode when instability occurs. The expansion of the dynamic system to include a realistic model of the suspension is shown to be important in determining the frequency of the excited mode. Adhesion force is shown to play an essential role in exciting the second air-bearing pitch mode and causing instability, while electrostatic force and friction force affect only some details of the slider's dynamics at instability. Friction force is also shown to be related to the excitation of the first air-bearing pitch mode.Index Terms-Head-disk interface, head-gimbal assembly, interfacial forces, thermal flying-height control.

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“…It has been shown through experiments and simulation that in addition to the slider air bearing surface (ABS) design the disk lubricant and suspension design play an important role in the slider touchdown process [9]. Numerical and analytical simulations accounting for the nonlinear forces at the head-disk interface (HDI) have also successfully explained the strong vibration dynamics of the slider close to the TDP and the subsequent suppression of vibrations for powers higher than the TDP [10][11][12], and they qualitatively support the experimental results reported for certain ABS designs [12,13]. A full understanding of the touchdown behavior of TFC sliders is still lacking, and it continues to be an active topic of research.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigations at the Head-Disk Interface of Thermal Fly-Height Control Sliders in Contact

Canchi

Bogy

Wang

et al. 2012

Advances in Tribology

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Accurate touchdown power detection is a prerequisite for read-write head-to-disk spacing calibration and control in current hard disk drives, which use the thermal fly-height control slider technology. The slider air bearing surface and head gimbal assembly design have a significant influence on the touchdown behavior, and this paper reports experimental findings to help understand the touchdown process. The dominant modes/frequencies of excitation at touchdown can be significantly different leading to very different touchdown signatures. The pressure under the slider at touchdown and hence the thermal fly-height control efficiency as well as the propensity for lubricant pickup show correlation with touchdown behavior which may be used as metrics for designing sliders with good touchdown behavior. Experiments are devised to measure friction at the head-disk interface of a thermal fly-height control slider actuated into contact. Parametric investigations on the effect of disk roughness, disk lubricant parameters, and air bearing surface design on the friction at the head-disk interface and slider burnishing/wear are conducted and reported.

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Investigation of Flying-Height Stability of Thermal Fly-Height Control Sliders in Lubricant or Solid Contact with Roughness

Cited by 44 publications

References 15 publications

Investigation of Nanoscale Heat Transfer and Flying Characteristics in Thermal Flying Height Control Sliders Considering Near-Field Radiation

Investigation of Nanoscale Heat Transfer and Flying Characteristics in Thermal Flying Height Control Sliders Considering Near-Field Radiation

Numerical Simulation of Touchdown Dynamics of Thermal Flying-Height Control Sliders

Parametric Investigations at the Head-Disk Interface of Thermal Fly-Height Control Sliders in Contact

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