This paper demonstrates three-dimensional magnetic resonance tomography (MRT) achieving a resolution of 5.9 ± 0.1 nm. Lithographically fabricated microwires generate three-dimensional magnetic field gradients, used to image nitrogen-vacancy (NV) centers in a densely doped diamond via Fourier-accelerated MRT. A compressed sensing scheme enables direct visual interpretation without numerical optimization and allows for zooming into specific regions of interest. This resolution rivals the best super-resolution microscopy techniques and approaches the accuracy of site-directed spin labeling, promising advancements in three-dimensional structure analysis using magnetic-gradient based tomography.

Mohammad T. Amavi, Andrii Treilin, You Huang, Paul Weinbrenner, Francesco Poggiali, Joachim Leibold, Martin Schalk, Friedemann Reinhard