Electrical switching of spin-magnon interaction

In recent years, strong interaction between surface confined propagating spin waves in ferromagnetic materials and single spins in color centers of diamond has been utilized for applications like quantum sensing and coherent driving of spins. The ability to switch this interaction electrically is essential to deterministically couple two spins via spin waves. In this work, we demonstrate electrical tuning of the coupling between spin waves and electron spins of nitrogen-vacancy centers (NV) in diamond. We electrically tune the magnon dispersion in thin CoFeB films, putting them in and out of resonance with the NV spin levels. The room-temperature magnetic noise of spin-waves affects the spin relaxation rate in NVs, in good quantitative agreement with analytical calculations. Our work opens up considerable opportunities for utilizing hybrid platforms combining quantum degree of freedom spins with macroscopic spin-waves in spin-based information and nanoscale sensing.