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CTOnews.com, October 28 (Xinhua) Quantum physicists have proved for the first time that it is possible to control and manipulate spin waves (spin waves) on chips in a superconducting environment, providing new insights into the interaction between magnets and superconductors.

If this technology can be used commercially in the future, it can replace the existing connection components in energy-saving information technology or quantum computers to further improve the performance of electronic products.

CTOnews.com note: spin waves are the collective motion of spin systems interacting in ordered magnetic (ferromagnetic, ferrimagnetic, antiferromagnetic) bodies due to various excitations.

In quantum mechanics, spin (English: Spin) is the intrinsic property of particles, and its operation rules are similar to the angular momentum of classical mechanics, resulting in a magnetic field.

The groundbreaking study was published in the journal Science.

It is theoretically predicted that metal electrodes can control spin waves, but physicists have seen little of this effect in experiments so far. Toeno van der Sar, associate professor in the Department of Quantum Nanoscience, said:

The breakthrough of our research team is that we prove that if we use superconducting electrodes, we can indeed control spin waves correctly.

How it works is as follows: spin waves generate magnetic fields, which in turn generate supercurrents in superconductors. The supercurrent acts as a mirror for spin waves: superconducting electrodes reflect the magnetic field back to spin waves. The superconducting mirror causes the spin wave to move up and down more slowly, which makes the wave easier to control.

Researcher Michael Borst said:

When spin waves pass through the superconducting electrode, their wavelengths are completely changed! By slightly changing the temperature of the electrode, we can adjust the magnitude of the change very accurately.

Der Sar says:

We start with a thin magnetic layer of yttrium iron garnet (YIG), which is called the best magnet on earth. On top of it, we place a superconducting electrode and another electrode to induce spin waves. By cooling to-268 degrees, we put the electrode into a superconducting state.

As the temperature gets colder, the spin wave becomes slower and slower. This provides us with a unique way to manipulate spin waves; we can deflect them, reflect them, make them resonate, and so on. But it also gives us huge new insights into the properties of superconductors.

CTOnews.com attached the reference address: M. Borst, P. H. Vree, A. Lowther, A. Teepe, S. Kurdi, I. Bertelli, B. G. Simon, Y. M. Blanter, T. van der Sar. Observation and control of hybrid spin-wave-Meissner-current transport modes. Science, 2023; 382 (6669): 430 DOI: 10.1126/science.adj7576

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