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Diamond Magnetometry of Superconducting Thin Films | A. Waxman
; H. Schlussel
; D. Groswasser
; V.M. Acosta
; L.-S. Bouchard
; D. Budker
; R. Folman
; | Date: |
12 Aug 2013 | Abstract: | In recent years diamond magnetometers based on the nitrogen-vacancy (NV)
center have been of considerable interest for magnetometry applications at the
nanoscale. An interesting application which is well suited for NV centers is
the study of nanoscale magnetic phenomena in superconducting materials. We
employ the magnetic sensitivity of the NV centers in diamond to interrogate the
magnetic properties of a thin-layer yttrium barium copper oxide (YBCO)
superconductor. Using fluorescence-microscopy methods and specially prepared
samples, we measure the temperature of phase transition in the layer to be
70.0(2) K, and the first critical field to be 46(4) G. We observe the pinning
of the vortices in the layer at 65 K, and estimate their density to be 1.10(2)
mu m ^{-2}. These measurements are done with a 10 nm thickness layer, so that
high spatial resolution may be enabled in the future. Based on these results,
we anticipate that this magnetometer could be useful for imaging the structure
and dynamics of the vortices. For future work, we present a fabrication method
for a superconductor chip designed for this purpose. | Source: | arXiv, 1308.2689 | Services: | Forum | Review | PDF | Favorites |
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