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There will be no NVIDIA processors

22.12.2009

NVIDIA CEO Jen-Sun Huang denied the recent rumors about the possibility of the company launching its own x86-compatible processor. In response to Broadpoint AmTech's Doug Friedman, he said that NVIDIA's strategy is clear enough and that all efforts are currently focused on developing visual and parallel computing tools.

Also, according to Huang, NVIDIA sees the greatest prospects for further growth in the promotion of graphics processors, intending to cover all types of platforms. For example, GPUs can be used in servers for parallel computing, as well as in supercomputers and cloud computing, and finally for video streaming.

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Single-layer graphene demonstrates giant magnetoresistance 24.04.2023

A team of physicists found in samples of single-layer graphene manifestations of giant magnetoresistance - the phenomenon of a change in electrical resistance when it enters a magnetic field. Graphene showed an increase in resistance with magnetic field induction by several hundred percent, although the resistance had a different character in weak and strong magnetic fields.

By changing electrical resistance in response to an applied magnetic field, materials exhibit the phenomenon of magnetoresistance. It arises as a result of the curvature of the trajectories of current carriers in the material under the influence of a magnetic field. One manifestation of this phenomenon is the giant magnetoresistance. It was found in multilayer magnetic materials, in which ferromagnetic layers were separated by non-magnetic layers a few nanometers wide, which led to a significant decrease in electrical resistance. The effect turned out to be much larger than the manifestations of magnetoresistance known by that time, which is why it was called "giant magnetoresistance" and found many applications in electronics.

Now, a team of physicists from universities in the UK and Singapore have announced that they have discovered the phenomenon of giant magnetoresistance in single-layer defect-free graphene.
Graphene is called one of the modifications of carbon, a material one atom thick, characterized by high mobility of charge carriers - more than one hundred thousand square centimeters per volt per second. In defect-free graphene, where electrons and holes are evenly distributed, they behave like a plasma, where massless electrons and holes collide at high speed. It exhibits unusual properties, such as quantum critical scattering or even hydrodynamic characteristics. However, little is known about the behavior of particle plasmas in magnetic fields.

For their experiment, physicists applied an electric field to single-layer graphene to compare the number of electrons and holes. The resulting defect-free graphene physicists were placed in magnetic fields ranging from 0,1 to 10 Tesla.

With smaller magnetic fields applied perpendicular to the graphene sample, the resistance increased by 110 percent, quadratically with the increase in magnetic field at a temperature of 300 kelvins. In strong magnetic fields, the resistance acquired a linear character and began to increase linearly with the growth of the magnetic field, and by 2 and 500 percent. This is several orders of magnitude higher than the magnetoresistance found in any other material at these temperatures.

Physicists hope to use the obtained results to explain the mechanisms of the appearance of giant magnetoresistance and other materials, which will be needed to use this phenomenon in spintronic devices.

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