LTS SQUID microscope with micron spatial resolution

Research output: Contribution to journalArticle

Authors

  • J Anderberg
  • DB Crum
  • Y Tokura
  • DN Paulson
  • RL Fagaly

Colleges, School and Institutes

Abstract

We describe A multichannel LTS SQUID microscope with micron spatial resolution. The system achieves micron resolution by the use of small (14 mum) detection coils and narrow gap between the coils and the object(s) being scanned. Samples ire mounted inside an exchange-gas can at the lower end of a cryogenic probe. This houses all of the cryogenic portions of the microscope and is filled with helium exchange gas. A 5 min x 5 mm scanning stage is used to scan the sample, which is at cryogenic temperatures. Stepping motors on the scanning stage allow step sizes as small as 0.16 mum. The SQUIDs are mounted on it cantilever structure with nine separate detection coils on the end of the structure. Flux noise of the SQUIDs is better than 5 muPhi(o)/rootHz. Sensitivity is better than 106 pT/rootHz with a bandwidth of dc-10 kHz. Open architecture software provides control of all critical system components,along with data acquisition and analysis. We have demonstrated spatial resolutions better than 2 mum. We discuss the impact of the external field coils for susceptibility measurements.

Details

Original languageEnglish
Pages (from-to)231-234
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume13(2)
Issue number2
Publication statusPublished - 1 Jun 2003

Keywords

  • SQUID, LTS, microscope