Acoustically Driven Magnetism for Controlling NV-Centers*

Nitrogen-vacancy (NV) center defects in diamond are a promising quantum information pro- cessing and quantum sensing platform due to their ability to be operated at room temperature, as well as their high sensitivity to local magnetic fields. It has been shown [1] that surface acoustic waves (SAWs) coupled to thin magnetic films can excite NV centers via an off-resonant drive by harnessing magnetoelastic interactions in the magnetic film. Due to the relatively short wavelength of microwave frequency SAW phonons these methods can be used to probe the local magnetic environment at the position of the NVs. Here, we present a new flip-chip device geometry to investigate the interaction between SAW-driven magnetism and NV ensembles located on the surface of diamond crystals. We are able to independently verify the launching of spin waves in the magnetic film by direct measurements of the SAW attenuation.

[1] Dominic Labanowski, Vidya Praveen Bhallamudi, Qiaochu Guo, Carola M. Purser, Bren- dan A. McCullian, P. Chris Hammel, and Sayeef Salahuddin. Voltage-driven, local, and efficient excitation of nitrogen-vacancy centers in diamond. Science Advances, 4(9), 2018.