Controlling waves in magnets with superconductors for the first time

https://phys.org/news/2023-10-magnets-superconductors.html

"thin layer yttrium iron garnet magnet, on top add superconducting electrode and another electrode which when cooled to -268° into superconducting state slows spins... varying temperature tunes this... reflects magnetic field back to spin wave causing spin waves to move up and down more slowly, enabling deflecting, reflecting, resonating... produce little heat or sound waves... energy-efficient spin-wave circuits, cell phones, quantum computer.s"