PRESS-NEWS.org - Press Release Distribution
PRESS RELEASES DISTRIBUTION

Progress toward terabit-rate high-density recording

2010-09-22
(Press-News.org) Washington, D.C. (September 21, 2010) -- Research is closing in on the next-generation of ultra-high-density magneto-optical storage devices that could store more than 6,000 Terabits (6 petabits) of data, more than 70 times the contents of the entire U.S. Library of Congress, on a single 5-inch disc. Yet the vast storage amount is limited by the ability to write data quickly enough to the device. In the Journal of Applied Physics, researchers at Sun Yat-Sen University in China have demonstrated a way to record on ferromagnetic films using a laser-assisted ultrafast magnetization reversal dynamics.

The technique uses so-called time-resolved polar Kerr spectroscopy combined with an alternating magnetic field strong enough to re-initialize the magnetization state of gadolinium-iron-cobalt (GdFeCo) thin films. Tianshu Lai and colleagues showed that the magnetization reversal could occur in a sub-nanosecond time scale, which implies that next- generation magneto-optical storage devices can not only realize higher recording densities but also ultrafast data writing of up to a gigahertz. Such speed is at least thirty times faster than that of present hard disks in computers.

Laser-assisted magnetic recording was demonstrated on a sub-picosecond time scale under a saturated external magnetic field. "We found that the rate of magnetization reversal is proportional to the external magnetic field," says Lai, "and the genuine thermo-magnetic recording should happen within several tens to hundreds of picoseconds when we apply a smaller magnetic field than the coercivity of the recording films."

###

The article, "Field-dependent ultrafast dynamics and mechanism of magnetization reversal across ferrimagnetic compensation points in GdFeCo amorphous alloy films" by Tianshu Lai, Zhifeng Chen, Ruixin Gao, Zixin Wang, Chudong Xu and Daxin C. (Zhongshan (Sun Yat-Sen) University) appears in the Journal of Applied Physics. http://link.aip.org/link/japiau/v108/i2/p023902/s1

Journalists may request a free PDF of this article by contacting jbardi@aip.org

ABOUT JOURNAL OF APPLIED PHYSICS

Journal of Applied Physics is the American Institute of Physics' (AIP) archival journal for significant new results in applied physics; content is published online daily, collected into two online and printed issues per month (24 issues per year). The journal publishes articles that emphasize understanding of the physics underlying modern technology, but distinguished from technology on the one side and pure physics on the other. See: http://jap.aip.org/

ABOUT AIP

The American Institute of Physics is a federation of 10 physical science societies representing more than 135,000 scientists, engineers, and educators and is one of the world's largest publishers of scientific information in the physical sciences. Offering partnership solutions for scientific societies and for similar organizations in science and engineering, AIP is a leader in the field of electronic publishing of scholarly journals. AIP publishes 12 journals (some of which are the most highly cited in their respective fields), two magazines, including its flagship publication Physics Today; and the AIP Conference Proceedings series. Its online publishing platform Scitation hosts nearly two million articles from more than 185 scholarly journals and other publications of 28 learned society publishers.

END



ELSE PRESS RELEASES FROM THIS DATE:

Watching electrons move in real time

2010-09-22
Washington, D.C. (September 21, 2010) -- At its most basic level, understanding chemistry means understanding what electrons are doing. Research published in The Journal of Chemical Physics not only maps the movement of electrons in real time but also observes a concerted electron and proton transfer that is quite different from any previously known phase transitions in the model crystal, ammonium sulfate. By extending X-ray powder diffraction into the femtosecond realm, the researchers were able to map the relocation of charges in the ammonium sulfate crystal after they ...

Stress before cancer therapy could help deadly cells survive treatment, lead to disease recurrence

2010-09-22
COLUMBUS, Ohio – Patients who experience physical or psychological stress – including rigorous exercise – one or two days before a cancer treatment might be unknowingly sabotaging their therapy, new research suggests. Stress in the body – even physical stress caused by intense exercise – activates a stress-sensitive protein that can spark a series of events that allow cancer cells to survive such treatments as chemotherapy and radiation, according to the research. Though the study involved a series of experiments in breast cancer cell cultures, the researchers say ...

Complex brain landscape controls speech

2010-09-22
Broca's region is classically regarded as the motor centre for speech. Our ability to form phonemes and words is controlled here. According to the maps of the cerebral cortex developed by Korbinian Brodmann, which are still in use today, Broca's region is composed of two areas. Over the last few years, however, researchers have begun to question this subdivision as a result of experience gained in clinical studies and the findings of magnetic resonance imaging analyses. "Lesions in Broca's region could result in a dozen different language problems," says Professor Katrin ...

Wake up your brain

2010-09-22
For advanced activities of our daily life (such as driving a car, or seeing a movie), to be awake is important. It has been known so far that neuropeptide in the brain called "Orexin"controls sleep and awakening besides appetite. Here, the research group led by Dr. Akihiro Yamanaka, National Institute for Physiological Sciences (NIPS), found that orexin-releasing neurons have the self-excitation mechanism that activate each other among them, and maintain awaking. From this result, the application to doze prevention or insomnia treatment can be expected. It is reported in ...

Dancing robot swan triggers emotions

Dancing robot swan triggers emotions
2010-09-22
The Dying Swan is sometimes moving smoothly and gently, sometimes in a dramatic and fiery manner, as Tchaikovsky´s majestic music from the ballet Swan Lake is playing. Yet this is no ordinary ballet dancer, but a robot in the form of a swan, created at Mälardalen University and choreographed by professional dancer Åsa Unander-Scharin. The swan robot´s just over four-minute-long dance has so far been seen only by a select few. But it has already made a big impression. Tearful eyes and words like "touching", "fascinating" and "beautiful" are some of the reactions. - We ...

Paper highlights need for new studies and guidelines around oxygen therapy during MI

2010-09-22
Sophia Antipolis, 21 September 2010: The European Society of Cardiology (ESC) welcomes a paper published today in the Journal of the American College of Cardiology (JACC )(1) highlighting concerns over the use of oxygen therapy during MI in patients with normal oxygen levels. The publication adds to calls for revision of the STEMI guidelines around oxygen therapy and for a prospective, large scale randomised trials, issues that were both first raised in a Cochrane Review published in June (2). "The upcoming ESC Clinical Practice Guidelines for the management of STEMI, ...

Genomic 'haircut' makes world's tiniest genome even smaller: UBC research

2010-09-22
The world's tiniest nuclear genome appears to have "snipped off the ends" of its chromosomes and evolved into a lean, mean, genome machine that infects human cells, according to research published today by University of British Columbia scientists. Until recently, E. cuniculi, a parasitic fungus commonly found in rabbits that can also be fatal to immunocompromised humans, has been widely regarded as having the smallest known nuclear genome. At 2.9 millions base pairs (Mbp) and approximately 2,000 genes, the genome of E. cuniculi is less than one-two thousandth the size ...

Training the trainers: How to minimize stress when horses are first ridden

2010-09-22
The horse was domesticated many thousands of years ago and has been hugely important in the development of human civilization. It is hard to overstate its role in agriculture, in transport and communications and even in military operations. More recently, equestrian sports have gained markedly in popularity, so even though the horse has largely been superseded in modern farming and military practice its connection to man remains as close as ever. Nevertheless, the horse retains at least some aspects of its wild origins. It is clear that horses are frequently subjected ...

NIH study models H1N1 flu spread

2010-09-22
As the United States prepares for the upcoming flu season, a group of researchers supported by the National Institutes of Health continues to model how H1N1 may spread. The work is part of an effort, called the Models of Infectious Disease Agent Study (MIDAS), to develop computational models for conducting virtual experiments of how emerging pathogens could spread with and without interventions. The study involves more than 50 scientists with expertise in epidemiology, infectious diseases, computational biology, statistics, social sciences, physics, computer sciences ...

New research improves ability to detect malware in cloud-computing systems

2010-09-22
Researchers from North Carolina State University have developed new software that offers significantly enhanced security for cloud-computing systems. The software is much better at detecting viruses or other malware in the "hypervisors" that are critical to cloud computing, and does so without alerting the malware that it is being examined. Cloud computing is being hailed as a flexible, affordable way of offering computer resources to consumers. Under the cloud-computing paradigm, the computational power and storage of multiple computers is pooled, and can be shared by ...

LAST 30 PRESS RELEASES:

Reality check: making indoor smartphone-based augmented reality work

Overthinking what you said? It’s your ‘lizard brain’ talking to newer, advanced parts of your brain

Black men — including transit workers — are targets for aggression on public transportation, study shows

Troubling spike in severe pregnancy-related complications for all ages in Illinois

Alcohol use identified by UTHealth Houston researchers as most common predictor of escalated cannabis vaping among youths in Texas

Need a landing pad for helicopter parenting? Frame tasks as learning

New MUSC Hollings Cancer Center research shows how Golgi stress affects T-cells' tumor-fighting ability

#16to365: New resources for year-round activism to end gender-based violence and strengthen bodily autonomy for all

Earliest fish-trapping facility in Central America discovered in Maya lowlands

São Paulo to host School on Disordered Systems

New insights into sleep uncover key mechanisms related to cognitive function

USC announces strategic collaboration with Autobahn Labs to accelerate drug discovery

Detroit health professionals urge the community to act and address the dangers of antimicrobial resistance

3D-printing advance mitigates three defects simultaneously for failure-free metal parts 

Ancient hot water on Mars points to habitable past: Curtin study

In Patagonia, more snow could protect glaciers from melt — but only if we curb greenhouse gas emissions soon

Simplicity is key to understanding and achieving goals

Caste differentiation in ants

Nutrition that aligns with guidelines during pregnancy may be associated with better infant growth outcomes, NIH study finds

New technology points to unexpected uses for snoRNA

Racial and ethnic variation in survival in early-onset colorectal cancer

Disparities by race and urbanicity in online health care facility reviews

Exploring factors affecting workers' acquisition of exercise habits using machine learning approaches

Nano-patterned copper oxide sensor for ultra-low hydrogen detection

Maintaining bridge safer; Digital sensing-based monitoring system

A novel approach for the composition design of high-entropy fluorite oxides with low thermal conductivity

A groundbreaking new approach to treating chronic abdominal pain

ECOG-ACRIN appoints seven researchers to scientific committee leadership positions

New model of neuronal circuit provides insight on eye movement

Cooking up a breakthrough: Penn engineers refine lipid nanoparticles for better mRNA therapies

[Press-News.org] Progress toward terabit-rate high-density recording