Journal
NATURE NANOTECHNOLOGY
Volume 11, Issue 8, Pages 700-705Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2016.68
Keywords
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Funding
- Air Force Office of Scientific Research PECASE award
- DARPA QuASAR
- MRSEC Program of the National Science Foundation [DMR 1121053]
- US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences [DE-SC0011978]
- Harvey L. Karp Discovery award
- U.S. Department of Energy (DOE) [DE-SC0011978] Funding Source: U.S. Department of Energy (DOE)
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High-spatial-resolution magnetic imaging has driven important developments in fields ranging from materials science to biology. However, to uncover finer details approaching the nanoscale with greater sensitivity requires the development of a radically new sensor technology. The nitrogen-vacancy (NV) defect in diamond has emerged as a promising candidate for such a sensor on the basis of its atomic size and quantum-limited sensing capabilities. It has remained an outstanding challenge to implement the NV centre as a nanoscale scanning magnetic probe at cryogenic temperatures, however, where many solid-state systems exhibit non-trivial magnetic order. Here, we present NV magnetic imaging down to 6 K with 3 mu T Hz(-1/2) field sensitivity, and use the technique to image vortices in the iron pnictide superconductor BaFe2(As0.7P0.3)(2) with critical temperature T-c = 30 K. The expansion of NV-based magnetic imaging to cryogenic temperatures will enable future studies of previously inaccessible nanoscale magnetism in condensed-matter systems.
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