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We report on direct, real-space imaging of the stray magnetic field above amicro-scale disc of a thin film of the high-temperature superconductorYBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) using scanning single spin magnetometry. Ourexperiments yield a direct measurement of the sample's local London penetrationdepth and allow for a quantitative reconstruction of the supercurrents flowingin the sample as a result of Meissner screening. These results show thepotential of scanning single spin magnetometry for studies of the nanoscalemagnetic properties of thin-film superconductors, which could be readilyextended to elevated temperatures or magnetic fields.

Real-space probing of the local magnetic response of thin-film superconductors using single spin magnetometry