Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Data storage: How magnetic recording heats up

09.11.2012
Characterization of the thermal processes involved in heat-assisted magnetic recording paves the way for commercial devices

Most electronic data is stored on magnetic hard drives that spin at many thousands of revolutions per minute. To keep pace with ever-growing storage demand, however, achieving greater storage capacities by simply increasing the size of disks is infeasible.

The required spinning speed would put immense physical strain on the components, particularly on the writing ‘head’ — a small needle-like object used to write data at particular points on the disk (see image).

An alternative technology, heat-assisted magnetic recording (HAMR), is now a significant step closer to commercial realization, thanks to the efforts of Baoxi Xu and his co-workers at the A*STAR Data Storage Institute, Singapore1. In a system using HAMR, laser light is emitted from a diode on the write head to locally heat the disk during data writing. This technique has the potential to increase a standard disk’s recording density by as much as two orders of magnitude. However, the additional heat can cause components such as the write head to destabilize and fall out of alignment.

By studying the temperature increase of the head, the thermal effects on the disk and the thermal response of the lubricant in HAMR, Xu and his co-workers discovered how to maximize the recording density of the medium. They began by establishing the three major heat sources present in the device: the laser diode, the optical transducer, which concentrates the incident light into a nanometer-sized spot, and the write pole, which performs the physical recording.

They found that the temperature of the transducer depends on both its size and distance from the write pole — both of which can be easily controlled in a commercial device. They also found that the temperature rise in the HAMR head does not significantly inhibit the performance of the laser diode, which is important.

Xu and his team’s results showed that the recording density of the medium can be maximized by reducing the number of layers through which the heat energy must pass before it can dissipate. This will be of prime importance for achieving the required high-density data storage goals of commercial devices. This study therefore represents an important breakthrough in our understanding of HAMR, and will be essential in bringing this technology closer to commercial fruition.

“Our work indicates the seriousness of the problems in the HAMR head, which gives a reference for HAMR design, and also provides a direction for improving thermal structures for high-density HAMR recording,” Xu says.

The A*STAR-affiliated researchers contributing to this research are from the Data Storage Institute

Journal information

Xu, B. X., Liu, Z. J., Ji, R., Toh, Y. T., Hu, J. F. et al. Thermal issues and their effects on heat-assisted magnetic recording system (invited). Journal of Applied Physics 111, 07B701 (2012).

A*STAR Research | Research asia research news
Further information:
http://www.a-star.edu.sg
http://www.researchsea.com

More articles from Physics and Astronomy:

nachricht Quantum optics allows us to abandon expensive lasers in spectroscopy
22.11.2017 | Lomonosov Moscow State University

nachricht Nano-watch has steady hands
22.11.2017 | University of Vienna

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Nanoparticles help with malaria diagnosis – new rapid test in development

The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.

Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....

Im Focus: A “cosmic snake” reveals the structure of remote galaxies

The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.

Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...

Im Focus: Visual intelligence is not the same as IQ

Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.

That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...

Im Focus: Novel Nano-CT device creates high-resolution 3D-X-rays of tiny velvet worm legs

Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.

During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....

Im Focus: Researchers Develop Data Bus for Quantum Computer

The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.

Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Ecology Across Borders: International conference brings together 1,500 ecologists

15.11.2017 | Event News

Road into laboratory: Users discuss biaxial fatigue-testing for car and truck wheel

15.11.2017 | Event News

#Berlin5GWeek: The right network for Industry 4.0

30.10.2017 | Event News

 
Latest News

Corporate coworking as a driver of innovation

22.11.2017 | Business and Finance

PPPL scientists deliver new high-resolution diagnostic to national laser facility

22.11.2017 | Physics and Astronomy

Quantum optics allows us to abandon expensive lasers in spectroscopy

22.11.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>