New spin on graphene

Apr 14, 2011
The image shows a flow of electrons (green arrows) which magnetises graphene in the opposite directions to the left and to the right from the current flow.

(PhysOrg.com) -- University of Manchester scientists have found a way to make wonder material graphene magnetic, opening up a new range of opportunities for the world’s thinnest material in the area of spintronics.

A team led by Professor Andre Geim, a recipient of the 2010 Nobel Prize for graphene, can now show that electric current – a flow of electrons – can magnetise graphene.

The results, reported in Science, could be a potentially huge breakthrough in the field of spintronics.

Spintronics is a group of emerging technologies that exploit the intrinsic spin of the electron, in addition to its fundamental electric charge that is exploited in microelectronics.

Billions of spintronics devices such as sensors and memories are already being produced. Every hard disk drive has a magnetic sensor that uses a flow of spins, and magnetic random access memory (MRAM) chips are becoming increasingly popular.

The findings are part of a large international effort involving research groups from the US, Russia, Japan and the Netherlands.

The key feature for spintronics is to connect the electron spin to as current can be manipulated by means routinely used in microelectronics.

It is believed that, in future spintronics devices and transistors, coupling between the current and spin will be direct, without using magnetic materials to inject spins as it is done at the moment.

So far, this route has only been demonstrated by using materials with so-called spin-orbit interaction, in which tiny magnetic fields created by nuclei affect the motion of electrons through a crystal. The effect is generally small which makes it difficult to use.

The researchers found a new way to interconnect spin and charge by applying a relatively weak magnetic field to and found that this causes a flow of spins in the direction perpendicular to electric current, making a graphene sheet magnetised.

The effect resembles the one caused by spin-orbit interaction but is larger and can be tuned by varying the external magnetic field.

The Manchester researchers also show that graphene placed on boron nitride is an ideal material for spintronics because the induced magnetism extends over macroscopic distances from the current path without decay.

The team believes their discovery offers numerous opportunities for redesigning current spintronics devices and making new ones such as spin-based transistors.

Professor Geim said: "The holy grail of spintronics is the conversion of electricity into magnetism or vice versa.

"We offer a new mechanism, thanks to unique properties of graphene. I imagine that many venues of spintronics can benefit from this finding."

Antonio Castro Neto, a physics professor from Boston who wrote a news article for the Science magazine which accompanies the research paper commented: "Graphene is opening doors for many new technologies.

"Not surprisingly, the 2010 Nobel Physics prize was awarded to Andre Geim and Kostya Novoselov for their groundbreaking experiments in this material.

"Apparently not satisfied with what they have accomplished so far, Geim and his collaborators have now demonstrated another completely unexpected effect that involves quantum mechanics at ambient conditions. This discovery opens a new chapter to the short but rich history of graphene".

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More information: Giant Nonlocality Near the Dirac Point in Graphene, by D.A Abanin, S.V.Morozov, L. A Ponomarenko, R.V Gorbachev, A.S Mayorov, M.I Katsnelson, Kenji Watanabe, Takashi Taniguchi, K.S Novoselov, L.S Levitov and A.K Geim. www.sciencemag.org/content/332/6027/328.full

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kaypee
not rated yet Apr 14, 2011
So, how susceptible is this spintronic tech to external magnetic fields or EMPS? Can I wreak havoc on my new spintronic computer by bringing a magnet too close to it?
Jeffhans1
not rated yet Apr 14, 2011
More importantly in my mind at least. Can you create an electromagnet out of layers of Graphene perhaps with an insulating layer? If so what are the potential applications for replacing copper windings for lighter, stronger, more efficient motors and generators.
maxcypher
not rated yet Apr 14, 2011
This is truly big: direct conversion between electricity to magnetism (and visa versa) -- definitely the Holy Grail, at least since Maxwell.