SKoreans demonstrate spin-injected field effect transistor

Sep 18, 2009

South Korean scientists said Friday they had demonstrated a spin-injected field effect transistor in a high-mobility InAs heterostructure.

Researchers at the state-run Korea Institute of Science and Technology (KIST) said the new transistor uses not only the on-off state of electric current but also electrons' spinning directions -- clockwise and counter-clockwise -- to handle information. It consumes less energy than existing semiconductors and opens the way for no-booting computers.

First conceptualized in the 1990s, "spin-injected field effect transistors" are seen as the next generation devices to replace the conventional .

"The prototype spin transistor has paved the way for developing new computers that do not require the time-consuming booting process," Koo Hyun-Cheol, one of the researchers told AFP.

"It will also help develop devices which have memory and central processing units merged into a single chip," he said.

KIST has spent some eight million dollars since 2002 developing the transistor.

It has applied for patents in the United States, Japan and other countries for the technology.

The breakthrough was published in this week's issue of Science magazine.

More information: Control of Spin Precession in a Spin-Injected Field Effect Transistor, Science 18 September 2009: Vol. 325. no. 5947, pp. 1515 - 1518, DOI: 10.1126/science.1173667

(c) 2009 AFP

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not rated yet Sep 18, 2009
--- uses not only the on-off state of electric current but also electrons' spinning directions -- clockwise and counter-clockwise -- to handle information. ---

does this mean that instead of storing one bit of information the trasistor can store 2 bits of information??

on spin-left
-- ---------
1 1
1 0
0 1
0 0

I wonder what the size scaling factor is on the this transistor.
not rated yet Sep 18, 2009
I wonder how they dealt with the problem of EM interferance. It sounds extremely sensitive.
not rated yet Sep 20, 2009
I'm probably late on this one as usual can photon spin be induced or manipulated? if they can do it with electrons, why not photons? any
particle with spin has angular momentum, does it not also release that energy upon target strike as well? if so is there any way for the target to differentiate spin energy? perhaps the target might be angled slightly? by the way, i don' now much about anything i am just fishing. p.s. these comments after the articles are more fun to read that anything else on the "spin" ternet!

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