A nanoscale SQUID operating at high magnetic fields

Journal Article · Thu Oct 13 00:00:00 EDT 2011 · Nanotechnology

DOI:https://doi.org/10.1088/0957-4484/22/45/455501· OSTI ID:1037858

Lam, Simon K. H.; Clem, John R; Yang, Wenrong

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 {approx} 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.

• Research Organization: Ames Lab., Ames, IA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC02-07CH11358
• OSTI ID: 1037858
• Report Number(s): IS-J 7640; TRN: US1201711
• Journal Information: Nanotechnology, Vol. 22, Issue 45; ISSN 1361-6528
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRITICAL CURRENT
FORECASTING
MAGNETIC FIELDS
MAGNETIZATION
VORTICES