Thermal dependence of MR signal on slider flying state

Chen, L.; Bogy, David B.; Strom, Brian

doi:10.1109/20.908482

Cited by 46 publications

(22 citation statements)

References 4 publications

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“…The change of surface thermal accommodation coefficient from 1.0, which is used in Ju's model [4], to 0.9, which is recommended in Zhang's and Chen's models [3,7] for the slider and disk surfaces, causes a difference less than 9% in the static transducer flying height and less than 1% in the pitch angle. The consideration of the temperature-dependence of the air molecule's mean free path in Zhou's model gives a relative difference less than 7% in the static transducer flying height when compared with Zhang's and Chen's models.…”

Section: Resultsmentioning

confidence: 99%

“…It is obvious that the viscous dissipation effect is negligible, even when the flying height is below 2 nm. All of the current HDI heat transfer models predict that the viscous dissipation contributed by Poiseuille flow is of the same order as that contributed by Couette flow [3,4,7,9]. So, it is reasonable to expect that the total viscous dissipation of the air bearing flow at the ABS has a negligible effect on the flying attitude of this thermally actuated pico slider.…”

Section: Viscous Dissipation Versus Air Bearing Coolingmentioning

confidence: 97%

“…The HDI heat transfer model developed by Chen et al [3] originates from the model by Zhang and Bogy [7]. Zhang's model and Chen's model both use the velocity slip and temperature jump boundary conditions.…”

Section: Heat Transfer Models For the Head-disk Interfacementioning

confidence: 99%

“…It was shown that the heat transfer from the slider to the disk through the air bearing film has a considerable effect on the flying height reduction efficiency. Their simulation work adopted a head-disk interface (HDI) heat transfer model developed by Chen et al [3]. The viscous dissipation in Chen's model was neglected in the simulation by Juang et al, as Chen's model concluded that on the air bearing surface (ABS) the viscous dissipation is about 1-2 orders of magnitude less than the heat conduction.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Static Flying Attitudes with Different Heat Transfer Models for a Flying-Height Control Slider with Thermal Protrusion

Bogy

2009

Tribol Lett

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The thermal flying height control (TFC), aka dynamic fly height (DFH), technique has been recently used in the head disk interface of hard disk drives to obtain a lower head-media spacing. The air bearing cooling effect, i.e., the heat conduction between the slider and the air film, has been incorporated in the numerical thermal-mechanical simulation of the slider's static performance. However, the heating effect of the viscous dissipation of the air flow has not been considered yet. In this article, both effects are included in the simulation of a flying slider with its flying height controlled by thermal protrusion, and different models for the air bearing cooling are used to obtain the slider's static flying attitudes. The simulation results directly show that the air bearing cooling is dominant compared with the viscous heating. All of the air bearing cooling models, including a recent one that considers the dependence of the air molecular mean free path on the air temperature, have simulation results close to each other. The largest relative difference in the simulated flying height is less than 9% even when the transducer flying height is lowered to below 2 nm.

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Section: Resultsmentioning

confidence: 99%

Section: Viscous Dissipation Versus Air Bearing Coolingmentioning

confidence: 97%

Section: Heat Transfer Models For the Head-disk Interfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of Static Flying Attitudes with Different Heat Transfer Models for a Flying-Height Control Slider with Thermal Protrusion

Bogy

2009

Tribol Lett

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“…Then the heat transfer model developed in [10] is used to determine the heat dissipation at the slider's surface. According to [10], the air bearing cooling is the dominating factor in the heat dissipation at a flying slider's surface. Therefore, it plays an important role in determining the TFC protrusion amount.…”

Section: Model and Solutionmentioning

confidence: 99%

Effects of Altitude on Thermal Flying-Height Control Actuation

et al. 2010

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Thermal flying-height control (TFC) is now a key technology used in hard-disk drives (HDD) as an effective way to push the magnetic spacing to sub-5 nm. Precise control of the TFC sliders' actuated flying-height (FH) is a major consideration in improving the read/write capability as well as reducing the reliability problem. In this paper, we investigate the response of TFC sliders to altitude changes with a focus on the variation of actuated FH. Numerical and experimental results both indicate an increase in the actuated FH at higher altitudes. Simulations show that the increased TFC protrusion and less air bearing pushback on sliders at higher altitudes contribute to this increase. This study is of practical importance for improving heater and air bearing surface design to reduce the TFC sliders' sensitivities to altitude changes.

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