Researchers create 'magnon switch' on silicon

June 17, 2020 //By Rich Pell
Room-temp 'magnon switch' promises highly efficient computing
Researchers at the National Institute of Standards and Technology (NIST) and the Massachusetts Institute of Technology (MIT) say they have demonstrated a potentially new way to make logic switches inside processing chips, enabling them to use less energy and radiate less heat.

The researchers have developed a practical technique for controlling magnons, which are essentially waves that travel through magnetic materials and can carry information. To use magnons for information processing requires a switching mechanism that can control the transmission of a magnon signal through the device.

Previous approaches to this required the use of exotic and expensive substrates, as well as refrigeration. The new approach, however, enables elements to be built on the silicon that commercial chips are made from and operates efficiently at room temperature.

As a result, say the researchers, this new approach might be more readily employed by computer manufacturers.

"This is a building block that could pave the way to a new generation of highly efficient computer technology," says team member Patrick Quarterman, a physicist at the NIST Center for Neutron Research (NCNR). "Other groups have created and controlled magnons in materials that do not integrate well with computer chips, while ours is built on silicon. It’s much more viable for industry."

Magnons - also called spin waves - would harness the property of electron spin to transfer information. In a conventional processor circuit, electrons travel from one place to another, and their movement generates heat; a magnon, however, moves through a long string of electrons, which themselves do not need to travel.

Instead, each electron's spin direction — which, say the researchers, is a bit like an arrow stretching through the axis of a spinning top — magnetically influences the spin direction of the next electron in line. Tweaking the spin of the first electron sends a wave of spin changes propagating down the string. Because the electrons themselves would not move, far less heat would result.

Because the electron string stretches from one place to another, the magnon can carry information as it travels down the string. In chips based on magnon technology, say the researchers, larger and smaller wave heights (amplitudes) could represent


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