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Author Topic: Science Marches On!  (Read 976 times)

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Offline risred1

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Science Marches On!
« on: May 16, 2007, 08:56:58 PM »
Is it any wonder as science continues to strip away at the foundation of the universe at the atomic level, that those who cannot cope with this capability....(Fill in the blank!)

May 16, 2007
Spintronics Breaks the Silicon Barrier
First breakthrough in applying spin-based electronics to silicon
 Researchers have taken the first step toward building silicon-based computers that use a fraction of the power of today's machines. A team has injected electrons into silicon in such a way that their spins, or magnetic orientations, tend to be aligned in one direction instead of the other.

Although the reported effect is subtle, silicon has never before supported such attempts to implement spintronics—the manipulation of electrons by their spins instead of their charges. "To us this is the holy grail of semiconductor spintronics," says physicist and electrical engineer Ian Appelbaum of the University of Delaware in Newark, who led the experiment. "As long as Intel is making CPUs out of silicon, we're going to have to learn how to manipulate spin in silicon."

One promise of spintronics is to slash waste heat in computers. In normal electronics, electric fields propel electrons, which shed heat in the process. In contrast, spins can move around on their own or under a magnetic field without producing much heat. But researchers had only shown they could control electron spin reliably in more niche varieties of semiconductor such as gallium arsenide, which is used in cell phones.

In the new device, Appelbaum and co-workers inject electrons from a layer of aluminum through a thin layer of ferromagnet (a permanent magnet) and into a pure silicon crystal. Aluminum has a 50–50 mix of spin up and spin down electrons-—the two possible orientations. The ferromagnet, however, blocks electrons of one spin while letting the others flow into the silicon.

The researchers found that their ferromagnet barrier gave silicon a one percent excess of one spin type versus the other, at a temperature of 85 kelvins, they report in a paper published online today in the journal Nature.

A real spintronics device would need to produce a pure stream of one spin type, Appelbaum says, adding that he expects to achieve "vast improvements" on this front in the near future. "Right now we're focused on fundamental materials science," he says. "Integration obviously is a goal, but at the moment it's not on the near term horizon."

The experiment brings the same spintronics tools to silicon that researchers have developed for other materials, says physicist David Awschalom of the University of California, Santa Barbara. In principle, he says, the effect should work at room temperature, which would allow researchers to study silicon spintronics in more realistic conditions. "It's a beautiful piece of work," he says.
risred1 - hiv +
02/07 CD4 404 - 27% - VL 15k
10/07 CD4 484 - 31% - VL 45k
05/08 CD4 414 - 26% - VL 70k
01/09 CD4 365 - 23% - VL 65k
05/09 CD4 291 - 23% - VL 115k - Started Meds - Reyataz/Truvada
06/09 CD4 394 - ?% - VL 1200 - Boosted Reyataz with Norvir and Truvada
07/09 CD4 441 - ?% - VL 118 - Boosted Reyataz with Norvir and Truvada
09/09 CD4 375 - ?% - VL Undetectable - Boosted Reyataz with Norvir and Truvada
12/09 CD4 595 - ?% - VL Undetectable - VIT D 34 - Reyataz/Truvada/Norvir

Offline anniebc

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Re: Science Marches On!
« Reply #1 on: May 16, 2007, 09:38:45 PM »
Whoa...you lost me at "Spintronics Breaks the Silicone Barrier"

I celebrated for days when I learnt how to switch my computer ON and OFF all by myself...and not much has changed since then... :D

Hugs
Jan
-----------------------------------------------------------------------
Never knock on deaths door..ring the bell and run..he really hates that.

Offline milker

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Re: Science Marches On!
« Reply #2 on: May 16, 2007, 09:43:29 PM »
Whoa...you lost me at "Spintronics Breaks the Silicone Barrier"

I celebrated for days when I learnt how to switch my computer ON and OFF all by myself...and not much has changed since then... :D

Hugs
Jan
Join the club, Jan.

Milker (who does computer support, but not hardware)
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Offline BT65

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  • Member
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Re: Science Marches On!
« Reply #3 on: May 16, 2007, 09:53:30 PM »
I'm just lucky I know how to use this damn thing at all! ;)
I've never killed anyone, but I frequently get satisfaction reading the obituary notices.-Clarence Darrow

 


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