Inert Gas Filled Head–Disk Interface for Future Extremely High Density Magnetic Recording

Zhou, Weidong; Liu, B.; Yu, Shengkai; Hua, Wei

doi:10.1007/s11249-008-9405-3

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…The combination with a two-dimensional readout was suggested, 26 but has not been introduced in a commercial product yet. He-filled HDD chassis with improved thermal properties do not address any of the above issues, but simply allow for more platters in one hard drive, thus increasing the storage capacity 27 while sacrificing reliability (the He is inevitably leaking from the HDD chassis and thus the device performance decreases over the years).…”

Section: Introductionmentioning

confidence: 99%

A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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The creation of large magnetic fields is a necessary component in many technologies, ranging from magnetic resonance imaging, electric motors and generators, and magnetic hard disk drives in information storage. This is typically done by inserting a ferromagnetic pole piece with a large magnetisation density M S in a solenoid. In addition to large M S , it is usually required or desired that the ferromagnet is magnetically soft and has a Curie temperature well above the operating temperature of the device. A variety of ferromagnetic materials are currently in use, ranging from FeCo alloys in, for example, hard disk drives, to rare earth metals operating at cryogenic temperatures in superconducting solenoids. These latter can exceed the limit on M S for transition metal alloys given by the Slater-Pauling curve. This article reviews different materials and concepts in use or proposed for technological applications that require a large M S , with an emphasis on nanoscale material systems, such as thin and ultra-thin films. Attention is also paid to other requirements or properties, such as the Curie temperature and magnetic softness. In a final summary, we evaluate the actual applicability of the discussed materials for use as pole tips in electromagnets, in particular, in nanoscale magnetic hard disk drive read-write heads; the technological advancement of the latter has been a very strong driving force in the development of the field of nanomagnetism.

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Section: Introductionmentioning

confidence: 99%

A review of high magnetic moment thin films for microscale and nanotechnology applications

et al. 2016

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“…It is clear from the table that achieving the ∼4.4 nm goal is a high risk, and it will require evolutionary as well as revolutionary changes in materials, processes, and clearance control schemes. HDD architecture (e.g., sealing in inert atmosphere) might also be needed [35]. This is discussed in the following sections.…”

Section: Astc Hdi Roadmap To 4 Tb/in 2 and Major Research Challengesmentioning

confidence: 99%

“…Finally, although many attempts have been made by disk manufacturers to develop and ship noncarbon overcoated disks, it remains an open question whether any thin film materials other than carbon can be made as hard, dense, and chemically inert as carbon films [43][44][45][46][47]. The latter issue could be alleviated if HDD's can be sealed in an inert environment [35]. It is also believed that such a drastic change in the drive mechanical platform could help reduce overcoat thickness on both heads and disks, as magnetic medium and read/write alloy corrosion could then be suppressed, or at least drastically reduced.…”

Section: Astc Hdi Roadmap To 4 Tb/in 2 and Major Research Challengesmentioning

confidence: 99%

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

Marchon

Pitchford

Hsia

et al. 2013

Advances in Tribology

103

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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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“…Currently, HDDs are normally not sealed and filled with the air at ambient pressure. There are some corrosion and reliability issues with using air as a lubricating gas, for instance, higher corrosion tendency from harsh operation environment, and the poor positioning errors due to flow induced vibrations 1,2 especially when the head-disk spacing drops below 2 nm.…”

Section: Introductionmentioning

confidence: 99%

Direct Monte Carlo simulation of nanoscale mixed gas bearings

Myo

Zhou

Lee

et al. 2015

Advances in Mechanical Engineering

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The conception of sealed hard drives with helium gas mixture has been recently suggested over the current hard drives for achieving higher reliability and less position error. Therefore, it is important to understand the effects of different helium gas mixtures on the slider bearing characteristics in the head-disk interface. In this article, the helium/air and helium/argon gas mixtures are applied as the working fluids and their effects on the bearing characteristics are studied using the direct simulation Monte Carlo method. Based on direct simulation Monte Carlo simulations, the physical properties of these gas mixtures such as mean free path and dynamic viscosity are achieved and compared with those obtained from theoretical models. It is observed that both results are comparable. Using these gas mixture properties, the bearing pressure distributions are calculated under different fractions of helium with conventional molecular gas lubrication models. The outcomes reveal that the molecular gas lubrication results could have relatively good agreement with those of direct simulation Monte Carlo simulations, especially for pure air, helium, or argon gas cases. For gas mixtures, the bearing pressures predicted by molecular gas lubrication model are slightly larger than those from direct simulation Monte Carlo simulation.

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Inert Gas Filled Head–Disk Interface for Future Extremely High Density Magnetic Recording

Cited by 14 publications

References 17 publications

A review of high magnetic moment thin films for microscale and nanotechnology applications

A review of high magnetic moment thin films for microscale and nanotechnology applications

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

Direct Monte Carlo simulation of nanoscale mixed gas bearings

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Inert Gas Filled Head–Disk Interface for Future Extremely High Density Magnetic Recording

Cited by 14 publications

References 17 publications

A review of high magnetic moment thin films for microscale and nanotechnology applications

A review of high magnetic moment thin films for microscale and nanotechnology applications

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

Direct Monte Carlo simulation of nanoscale mixed gas bearings

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Product

Resources

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