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A room temperature field-effect transistor using graphene's electron spin

Silicon spin transistors heat up and spins last longer

SALT LAKE CITY, March 15, 2011
University of Utah researchers built "spintronic" transistors and used them to align the magnetic "spins" of electrons for a record period of time in silicon chips at room temperature. The study is a step toward computers, phones and other spintronic devices that are faster and use less energy than their electronic counterparts.
Left, a dozen three-contact nickel-iron transistors sit on a silicon chip coated with an ultra-thin film of magnesium oxide. Right, a six-transistor chip attached to electrical contacts for experiments showing that the magnetic "spins" of electrons can be aligned as they travel through silicon at room temperature -- a step toward "spintronic" computers and other devices that are faster and more energy efficient than their electronic counterparts.
Photo Credit: Jiajia Tan, University of Utah
More: http://www.bloggero.info/silicon-spin-transistors-heat-and-spins-last-longer-7958
DonEMitchell 15:44, 4 January 2013 (MST)

University of Utah physicists invent 'spintronic' LED


SALT LAKE CITY, July 12, 2012 – University of Utah physicists invented a new "spintronic" organic light-emitting diode or OLED that promises to be brighter, cheaper and more environmentally friendly than the kinds of LEDs now used in television and computer displays, lighting, traffic lights and numerous electronic devices.
A new "spintronic" organic light-emitting diode glows orangish (center) when the device, chilled well below freezing, is exposed to a magnetic field from the two poles of an electromagnet located on either side of the device. University of Utah physicists report inventing the new kind of LED in the July 13 issue of the journal Science.
"It's a completely different technology," says Z. Valy Vardeny, University of Utah distinguished professor of physics and senior author of a study of the new OLEDs in the July 13, 2012 issue of the journal Science. "These new organic LEDs can be brighter than regular organic LEDs."
Photo Credit: Tho Nguyen, University of Utah
More: http://www.bloggero.info/university-utah-physicists-invent-spintronic-led-28923
DonEMitchell 15:44, 4 January 2013 (MST)

NRL scientists achieve high temperature milestone in silicon spintronics

Published in the 22 March 2011 issue of Nature Communications 2:245 DOI: 10.1038/ncomms1256 (2011).
(WASHINGTON) -- Researchers in the Materials Science and Technology division of the Naval Research Laboratory have recently demonstrated electrical injection, detection and precession of spin accumulation in silicon, the cornerstone material of modern device technology, at temperatures up to 225 degrees Celsius. These results provide the first demonstration that spin accumulation in Si is viable as a basis for practical devices which meet the operating temperatures specified for commercial (85˚C), industrial (100˚C) and military (125˚C) applications. This is a key enabling step for developing devices which rely on electron spin rather than electron charge, an approach known as semiconductor spintronics that is expected to provide devices with higher performance, lower power consumption and less heat dissipation. The complete findings of this study titled, "Electrical injection and detection of spin accumulation in silicon at 500K with magnetic metal / silicon dioxide contacts" are published in the 22 March 2011 issue of Nature Communications 2:245 DOI: 10.1038/ncomms1256 (2011).
More: ttp://www.bloggero.info/nrl-scientists-achieve-high-temperature-milestone-silicon-spintronics-10309