Thermal flying-height control sliders in hard disk drives filled with air-helium gas mixtures

Liu, Nan; Zheng, Jinglin; Bogy, David B.

doi:10.1063/1.3268468

Cited by 20 publications

(5 citation statements)

References 9 publications

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“…Slider dynamics in the regime from sub-10 nm clearance to sub-nanometer clearance has been widely investigated by many researchers (Juang et al 2006;Li et al 2009;Zhang et al 2009;Liu et al 2009;Knigge et al 2006;Tang et al 2007;Xu et al 2009;Hua et al 2009;Canchi and Bogy 2010;Suh and Polycarpou 2005;Vakis et al 2009;Tani et al 2009;Ono 2009; Thornton and Bogy 2004). There are many experimental and numerical investigations as well as qualitative correlations.…”

Section: Introductionmentioning

confidence: 99%

“…The MEMS thermal actuated flying-height control (TFC) sliders have been adapted by the magnetic recording industry as an effective design to reduce head-disk spacing in disk drives to achieve Terabit per square inch recording densities (Juang et al 2006;Li et al 2009;Zhang et al 2009;Liu et al 2009). The current control feature needs an accurate touchdown detection mechanism as a prerequisite.…”

Section: Introductionmentioning

confidence: 99%

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A parameter identification method for thermal flying-height control sliders

Sheng

2011

Microsyst Technol

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This paper employs higher order frequency response functions to describe the closed-form solution of nonlinear dynamics of MEMS thermal actuated flyingheight control (TFC) slider, and employs the measured acoustic emission signal of a TFC slider during touch down as its vibration approximation to correlate with the derived closed-form solution for parameter identification. It is shown that during slider touchdown when heater power is increased gradually, the slider performs weak nonlinear vibrations in early transition phase, and exhibits linear vibration in the following steady sliding phase. These results are useful for the clarification of complicated dynamics and the designs of active sliders in sub-nanometer clearance regime.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A parameter identification method for thermal flying-height control sliders

Sheng

2011

Microsyst Technol

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“…Most modern HDDs are not sealed and the entire HDD is filled with air at ambient pressure, which relates to several issues concerning the HDDs' reliability [4]- [6]. Compared to some other gases such as hydrogen and helium, air has a higher density and lower thermal conductivity.…”

Section: Introductionmentioning

confidence: 99%

Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

2011

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Filling hard disk drives with air-helium gas mixtures instead of pure helium can balance performance improvement, such as reduced power cost, increased capacity and improved reliability, against manufacturing cost increase. A consistent approach is proposed here to investigate the flying performance of thermal flying height control sliders flying in air-helium gas mixtures. It is found that the smallest power required for a designated flying height appears when the gas mixture is composed of about half helium and half air. The proposed numerical approach can also find application in investigating a slider's flying performance in a humid environment.Index Terms-Flyability, gas mixtures, head-disk interface (HDI), thermal flying-height control (TFC).

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“…The pressure in the air gap can build up to more than 100 atm, resulting in a strong thermal conduction flow directed from the slider to the disk. This process has received extensive investigation due to its strong coupling to the slider thermo-mechanics and the air bearing dynamics, resulting in significant impacts on crucial performances such as recording spacing, data storage density and power consumption 3–8 . With the rapid growth of storage capacity, the minimum gap size now approaches ~1 nm or even sub-nanometer.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer across a nanoscale pressurized air gap and its application in magnetic recording

Zheng

Chen

Qin

2018

Sci Rep

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In this study, we investigated how a thermally actuated air bearing slider heats up a fast-spinning storage disk through a highly pressurized nanoscale air gap in a magnetic recording system. A Eulerian-description-based computational approach is developed considering heat conduction through a pressurized air film and near-field radiation across the gap. A set of field equations that govern the air bearing dynamics, slider thermo-mechanics and disk heat dissipation are solved simultaneously through an iterative approach. A temperature field on the same order as the hot slider surface itself is found to be established in the disk. The effective local heat transfer coefficient is found to vary substantially with disk materials and linear speeds. This approach quantifies the magnitude of different thermal transport schemes and the accuracy is verified by an excellent agreement with our experiment, which measures the local slider temperature rise with a resistance temperature sensor. It also demonstrates an effective computational approach to treat transient thermal processes in a system of components with fast relative speed and different length scales. Finally, the investigated thermal transport mechanism leads to a substantial spacing change that has a significant impact on the spacing margin of today’s magnetic storage systems.

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Thermal flying-height control sliders in hard disk drives filled with air-helium gas mixtures

Cited by 20 publications

References 9 publications

A parameter identification method for thermal flying-height control sliders

A parameter identification method for thermal flying-height control sliders

Thermal Flying-Height Control Sliders in Air-Helium Gas Mixtures

Heat transfer across a nanoscale pressurized air gap and its application in magnetic recording

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