A nanoscale SQUID operating at high magnetic fields

TitleA nanoscale SQUID operating at high magnetic fields
Publication TypeJournal Article
Year of Publication2011
AuthorsLam SKH, Clem JR, Yang WR
Journal TitleNanotechnology
Volume22
Pages455501
Date Published11
Type of ArticleArticle
ISBN Number0957-4484
Accession NumberWOS:000296750300009
Keywordsdc-squid, niobium, quantum interference device
Abstract

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.

DOI10.1088/0957-4484/22/45/455501
Alternate JournalNanotechnology