Optically-detected broadband paramagnetic resonance spectroscopy using nitrogen-vacancy centers in diamond
Carola M. Purser, Vidya P. Bhallamudi, Christopher S. Wolfe, Huma Yusuf, Brendan A. McCullian, Ciriyam Jayaprakash, Michael E. Flatté and P. Chris Hammel
Received: 8th March 18
Nitrogen-vacancy (NV) centers in diamond provide an excellent platform for high sensitivity nanoscale magnetic resonance (MR) spectroscopy in ambient conditions. We present a broadband approach to detecting paramagnetic resonance that enables spectroscopic studies under diverse conditions of field magnitude and orientation. This easily implementable, relaxation-based protocol requires neither direct microwave manipulation of the NV spins nor spectral overlap between NV and target spin resonances. We demonstrate MR spectroscopy of paramagnetic P1 defect center spins in diamond whose spectra are clearly identifiable by their dispersions and anisotropic hyperfine structure. We propose that the unexpected sensitivity of NV spins to excitation of P1 resonances results from phonon-mediated NV-P1 cross relaxation. Extending our technique to spins outside the diamond would make it particularly effective for broadband studies, characterizing anisotropic materials, and probing dynamical processes at submicron scales.
Read in full at arXiv.
This is an abstract of a preprint hosted on an independent third party site. It has not been peer reviewed but is currently under consideration at Nature Communications.