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Now if only we had computers fast enough to process all that data.

Researchers at Sun Yat-Sen University in China have demonstrated a way to record on ferromagnetic films using laser-assisted ultrafast magnetization reversal dynamics. The development will allow for practical use of new technology for recording more than 6,000 terabits (6 petabits) of data on a single 5-inch disc, using ultra-high-density magneto-optical storage devices.

The new ultrafast recording technique uses “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. The researchers showed that the magnetization reversal could occur on 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 — 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 Tianshu 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.”

Reference: “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.

More info:American Institute of Physics news

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Dungeons and Dragons should update the armor class for cloth.

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This mosaic of Alexander the Great shows the king wearing linothorax — an armor made from laminated linen.

Alexander the Great and his soldiers protected themselves with linothorax, a type of body armor made by laminating together layers of linen.

Modern tests using the materials available at the time suggest that the laminated linen would have been effective in protecting against arrows and swords and other ancient weapons.

In order to determine how wearable this armor was, and how effective it would have been in protecting its wearer from arrows and other battlefield hazards, Aldrete and Bartell reconstructed several complete sets of linen armor using only material that were only available in the ancient world.

“The hardest part of the project was finding truly authentic linen. It had to be made from flax plants that were grown, harvested and processed, spun and woven by hand,” Aldrete said.

The other key ingredient was glue, which was placed over various layers of linen. The researchers chose to work with two simpler glues that would have been available everywhere: a glue made from the skins of rabbits and another from flax seeds.

Tests included shooting the resulting patches with arrows and hitting them with a variety of weapons including swords, axes and spears.

“Our controlled experiments basically dispelled the myth that armor made out of cloth must have been inferior to other available types. Indeed, the laminated layers function like an ancient version of modern Kevlar armor, using the flexibility of the fabric to disperse the force of the incoming arrow,” Aldrete said

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People in our family would benefit greatly from research like this.

UCSF researchers today unveiled a prototype model of the first implantable artificial kidney, in a development that one day could eliminate the need for dialysis.

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I’ve always wanted one of these as a pet.

Could I be overfeeding the hamster?

where der iz hamstas, nomz always follow.

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