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Diamond Magnetometry of Superconducting Thin Films
Y. Schlussel [1] , A. Waxman [1] , V.M. Acosta [2,3] , D. Budker [2] , L.-S. Bouchard [4] , R. Folman [1]
[1] Department of Physics, Ben Gurion University of the Negev, Be’er Sheva
[2] Department of Physics, University of California at Berkeley
[3] Google[x], 1600 Amphitheatre Parkway, Mountain View, California
[4] Department of Chemistry and Biochemistry University of California, Los Angeles, California
In recent years diamond magnetometers based on the nitrogen-vacancy (NV) center have been of considerable interest for applications on the nanoscale. An interesting application which is well suited for NV centers is the study of nanoscale magnetic phenomena in superconducting materials.We employ NV centers to interrogate magnetic properties of a thin-layer yttrium barium copper oxide (YBCO) superconductor. Using fluorescence microscopy, we measure the temperature of the phase transition and the penetration field of vortices. These measurements are done with a 100 nm thick NV layer, so that high spatial resolution may be enabled in the future. Wide-field imaging of the magnetic field above a wire was also demonstrated. Based on these results, we anticipate that this magnetometer could be useful for imaging the structure and dynamics of vortices.