The team found that by applying a magnetic field to a graphene ribbon, it is possible to change the resistance of current flowing through it. For this device, the magnetic field is controlled by increasing or decreasing the current through adjacent carbon nanotubes. Increasing or decreasing the strength of the magnetic field would also increase or decrease the flow of current through this new kind of transistor, much like a valve controlling the flow of water through a pipe.
Researchers at the University of Central Florida, the University of Texas at Dallas and other collaborators have designed a graphene-based transistor which could be used to create an all-carbon spin logic design with the potential to someday lead to computers that are a thousand times faster and use a hundredth of the power.
The design is based on graphene nanoribbons and carbon nanotubes, which in conjunction can be used to create cascaded logic gates that are not physically linked. The communication between the gates happens via an electromagnetic wave (and does not use any physical movement of electrons), it is anticipated that communication will be much quicker – with the potential for terahertz clock speeds. The size of these logic gates will be much smaller than silicon based gates.
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