Revolutionizing Technology: Superconductors Master Spin Waves on Chips

Physicists use superconductors to control spin waves on a chip, paving the way for energy-efficient tech and quantum computer advancements.

Theory predicts that metal electrodes give control over spin waves, but physicists have barely seen such effects in experiments until now. “The breakthrough of our research team is that we show that we can indeed control spin waves properly if we use a superconducting electrode,” says Toeno van der Sar, Associate Professor in the Department of Quantum Nanoscience.It works as follows: a spin wave generates a magnetic field that in turn generates a supercurrent in the superconductor.

“We started with a thin magnetic layer of yttrium iron garnet , known as the best magnet on Earth. On top of that we laid a superconducting electrode and another electrode to induce the spin waves. By cooling to -268 degrees, we got the electrode into a superconducting state,” Van der Sar says. “It was amazing to see that the spin waves got slower and slower as it got colder.

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