Diamond magnetometry of superconducting thin films

A. Waxman, Y. Schlussel, D. Groswasser, V. M. Acosta, L. S. Bouchard, D. Budker, R. Folman

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

In recent years, diamond magnetometers based on the nitrogen-vacancy (NV) center have been of considerable interest for 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 NV centers to interrogate magnetic properties of a thin-layer yttrium barium copper oxide (YBCO) superconductor. Using fluorescence-microscopy methods and samples integrated with an NV sensor on a microchip, we measure the temperature of phase transition in the layer to be 70.0(2) K and the penetration field of vortices to be 46(4) G. We observe pinning of the vortices in the layer at 65 K and estimate their density after cooling the sample in a ∼10-G field to be 0.45(1) μm-2. These measurements are done with a 10-nm-thick NV 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 vortices. As an outlook, we present a fabrication method for a superconductor chip designed for this purpose.

Original languageEnglish
Article number054509
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number5
DOIs
StatePublished - 18 Feb 2014

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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