Journal
NANOTECHNOLOGY
Volume 22, Issue 45, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/22/45/455501
Keywords
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Funding
- US Department of Energy, Office of Basic Energy Science, Division of Materials Sciences and Engineering [DE-AC02-07CH11358]
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A washer-free Nb nanoSQUID has been developed for measuring magnetization changes from nanoscale objects. The SQUID loop is etched into a 250 nm wide Au/Nb bilayer track and the diameter of the SQUID hole is similar to 70 nm. In the presence of a magnetic field perpendicular to the plane of the SQUID, vortex penetration into the 250 nm wide track can be observed via the critical current-applied field characteristic and the value at which vortex first penetrates is consistent with the theoretical prediction. Upon removing the applied field, the penetrated vortices escape the track and the critical current at zero field is restored.
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