Scientists couple terahertz radiation with spin waves

https://phys.org/news/2023-01-scientists-couple-terahertz.html

"efficient coupling of terahertz waves with much shorter wavelength spin waves... two metal films a few nanometers thick, with a ferromagnetic layer sandwiched in between is combination of materials precisely tuned to "translate" signals from the world of light into the world of spins.... electron spin is in motion but no current flow is involved, so there are no heat losses... development of novel, energy-saving spin-based technologies for data processing"