Imaging of magnetic vortices in superconducting networks and clusters by scanning SQUID microscopy

L. N. Vu, M. S. Wistrom, D. J. Van Harlingen

Research output: Contribution to journalArticlepeer-review

Abstract

We have imaged the configuration of trapped magnetic vortices in two-dimensional superconductor arrays and clusters using a scanning SQUID microscope (SSM). The SSM scans a dc SQUID detector over the array surface, achieving better than 10 μm spatial resolution over a scan range up to 1 cm×1 cm and a magnetic flux sensitivity of about 10 -4Φ0. We have obtained images of large square arrays cooled at different values of applied magnetic flux per cell Φ. For low rational values (1/2,1/3,1/4,.) of the frustration parameter f=Φ/Φ0, we find regions of periodically arranged vortices separated by domain walls; at other values of the field, the vortex pattern is disordered. We also present observations of vortex patterns in ensembles of 3×3 clusters.

Original languageEnglish (US)
Pages (from-to)1693-1695
Number of pages3
JournalApplied Physics Letters
Volume63
Issue number12
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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