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Curved Carbon for Electronics of the Future - <br /> <b>Strict Standards</b>: Non-static method SELanguage::_get() should not be called statically, assuming $this from incompatible context in <b>/home3/nextron/public_html/include/smarty/templates_c/%%05^053^053AB562%%header_article2.tpl.php</b> on line <b>16</b><br /> <br /> <b>Strict Standards</b>: Non-static method SELanguage::_init() should not be called statically, assuming $this from incompatible context in <b>/home3/nextron/public_html/include/language/language.php</b> on line <b>614</b><br /> insciences
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Categories: Carbon Electronics Magnetic field Nanoelectronic components Nanoelectronics Nanotechnology Spin

Curved Carbon for Electronics of the Future

A new scientific discovery could have profound implications for nanoelectronic components. Researchers from the Nano-Science Center at the Niels Bohr Institute, University of Copenhagen, in collaboration with Japanese researchers, have shown how electrons on thin tubes of graphite exhibit a unique interaction between their motion and their attached magnetic field – the so-called spin. The discovery paves the way for unprecedented control over the spin of electrons and may have a big impact on applications for spin-based nanoelectronics. The results have been published in the prestigious journal Nature Physics. 

Carbon is a wonderfully versatile element. It is a basic building block in living organisms, one of the most beautiful and hardest materials in the form of diamonds and is found in pencils as graphite. Carbon also has great potential as the foundation for computers of the future as components can be produced from flat, atom thin graphite layers, observed for the first time in the laboratory in 2004 – a discovery which elicited last year’s Nobel Prize in Physics. 

In addition to a charge all electrons have an attached magnetic field – a so-called spin. One can imagine that all electrons carry around a little bar magnet. The electron’s spin has great potential as the basis for future computer chips, but this development has been hindered by the fact that the spin has proved difficult to control and measure. 

In flat graphite layers the movement of the electrons do not affect the spin and the small bar magnets point in random directions. As a result, graphite was not an obvious candidate for spin based electronics at first.

New spin in curved carbon

"However, our results show that if the graphite layer is curved into a tube with a diameter of just a few nanometers, the spin of the individual electrons are suddenly strongly influenced by the motion of the electrons. When the electrons on the nanotube are further forced to move in simple circles around the tube the result is that all the spins turn in along the direction of the tube", explain the researchers Thomas Sand Jespersen and Kasper Grove-Rasmussen at the Nano-Science Center at the Niels Bohr Institute.

It has previously been assumed that this phenomenon could only happen in special cases of a single electron on a perfect carbon nanotube, floating freely in a vacuum – a situation that is very difficult to realize in reality. Now the researchers’ results show that the alignment takes place in general cases with arbitrary numbers of electrons on carbon tubes with defects and impurities, which will always be present in realistic components.

The interaction between motion and spin was measured by sending a current through a nanotube, where the number of electrons can be individually controlled. The two Danish researchers explain that they have further demonstrated how you can control the strength of the effect or even turn it off entirely by choosing the right number of electrons. This opens up a whole range of new possibilities for the control of and application of the spin.

Unique Properties

In other materials, like gold for example, the motion of the electrons also have a strong influence on the direction of the spin, but as the motion is irregular, one cannot achieve control over the spin of the electrons. Carbon distinguishes itself once again from other materials by possessing entirely unique properties – properties that may be important for future nanoelectronics.

Contact: Gertie Skaarup, Tel: + 45 3532-5320, Email: skaarup@nbi.dk

Source: Niels Bohr Institute, University of Copenhagen

 


Photos (1)  [ view all photos ]


An electron has a magnetic field attached – the so-called spin. One can imagine that all electrons carry around a little bar magnet. In flat graphite layers the small bar magnets point in random directions. By bending the atom thin graphite layer into a tube with a diameter of just a few nanometers the individual electrons are forced to move in simple circles around the tube and all the spins align in the direction of the tube. This feature can be used in future nanoelectronics. Source: Niels Bohr Institute, University of Copenhagen

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Credits / Source:

An electron has a magnetic field attached – the so-called spin. One can imagine that all electrons carry around a little bar magnet. In flat graphite layers the small bar magnets point in random directions. By bending the atom thin graphite layer into a tube with a diameter of just a few nanometers the individual electrons are forced to move in simple circles around the tube and all the spins align in the direction of the tube. This feature can be used in future nanoelectronics. Source: Niels Bohr Institute, University of Copenhagen

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