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Spintronics

A 'spin ratchet' paves the way for spin computers: New electronic structure for generating spin current

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TechAndComputer (Dec. 20, 2010) — Scientists have proposed and experimentally demonstrated a ratchet concept to control the spin motion. In analogy to a ratchet wrench, which provides uniform rotation from oscillatory motion, such ratchets achieve directed spin transport in one direction, in the presence of an oscillating signal. Most important, this signal could be an oscillatory current that results from environmental charge noise; thus future...

TechAndComputer (Dec. 20, 2010) — Scientists have proposed and experimentally demonstrated a ratchet concept to control the spin motion. In analogy to a ratchet wrench, which provides uniform rotation from oscillatory motion, such ratchets achieve directed spin transport in one direction...

Elusive spintronics success could lead to single chip for processing and memory

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TechAndComputer (Dec. 9, 2010) — Researchers from Queen Mary, University of London (UK) and the University of Fribourg (Switzerland) have shown that a magnetically polarised current can be manipulated by electric fields.

Published this week in the journal Nature Materials, this important discovery opens up the prospect of simultaneously processing and storing data on electrons held in the molecular structure of computer chips -- combining...

TechAndComputer (Dec. 9, 2010) — Researchers...

Water could hold answer to graphene nanoelectronics

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TechAndComputer (Oct. 28, 2010) — Researchers at Rensselaer Polytechnic Institute developed a new method for using water to tune the band gap of the nanomaterial graphene, opening the door to new graphene-based transistors and nanoelectronics.

By exposing a graphene film to humidity, Rensselaer Professor Nikhil Koratkar and his research team were able to create a band gap in graphene -- a critical prerequisite to creating graphene transistors. At...

TechAndComputer (Oct. 28, 2010) —...

Trapping charged particles with laser light

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TechAndComputer (Oct. 27, 2010) — In the past decades, setups for trapping single particles have played a key role in high precision quantum measurements because they allow for an ultimate control of all important experimental parameters. However, until now scientists had to choose between two alternative strategies: either to capture charged atoms (i.e. ions) in strong radiofrequency fields, or to keep neutral atoms in place by light fields.

Dr....

TechAndComputer (Oct. 27, 2010) — In...

Unexpected magnetic order among titanium atoms discovered

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TechAndComputer (Oct. 18, 2010) — Theoretical work done at the Department of Energy's Oak Ridge National Laboratory has provided a key to understanding an unexpected magnetism between two dissimilar materials.

The results, published in Nature Communications, have special significance for the design of future electronic devices for computations and telecommunications, according to co-author Satoshi Okamoto of ORNL's Materials Science and...

TechAndComputer (Oct. 18, 2010) — Theoretical...