Diamond magnetic sensing and imaging*

Diamond magnetic sensing has emerged as a powerful tool to detect nanomagnetism in biological and solid-state samples, as well to measure weak signals from nuclear spins and spin textures of molecules. We report ongoing experiments that explore several applications of diamond magnetic sensing. These include: (i) microfluidic nuclear magnetic resonance spectrometer capable of sensing small quantities (< 1 pL) of analyte [1], achieving spectral resolutions capable of distinguishing proton with heteronuclear J splittings; (ii) a wide-field magnetic microscope able to measure the stray magnetic fields produced by individual malarial hemozoin biocrystals (size < 300 nm) [3] and magnetization relaxation of single magnetic nanoparticles (size < 25 nm) at room temperature and as a function of applied field up to 350 mT. [1] P. Kehayias*, A. Jarmola*, N. Mosavian, I. Fescenko, F. M. Benito, A. Laraoui, J. Smits, L. Bougas, D. Budker, A. Neumann, S. R. J. Brueck, V. M. Acosta, Nature Commu. 8, 188 (2017). [2] I. Fescenko, A. Laraoui, J. Smits, N. Mosavian, P. Kehayias, J. Seto, L. Bougas, A. Jarmola, V. M. Acosta, arxiv:1808.03636 (2018).