Improvement of sensitivity for a compact magnetometer using HTS-SQUID with rotating sample

Daichi Hamasaki, Naohiro Okamoto, Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We previously reported a compact magnetometer using HTS-SQUID with a rotating sample for routine testing. In this study, we have improved the detection limit of the system to detect a very weak secondary magnetic field from diamagnetic material. The system consisted of a rotating sample table, a magnet with a pick-up coil, and an HTS-SQUID. The six sample cases can be fixed to a turntable using sample arms to enable multiple-detection. By rotating the sample, the velocity of the sample passing above the pick-up coil could be increased compared to the vibrating-sample method. The pick-up coil was directly coupled to a superconducting input coil of the HTS-SQUID to transfer the detected signal to the HTS-SQUID. The HTS-SQUID attached to a sensor probe was cooled by liquid nitrogen in a Dewar vessel, which was enclosed in a bilayer magnetically shielded cylindrical box. To improve the detection limit of the magnetometer's susceptibility, the noise of the applied magnetic fields was reduced, the pick-up coil shape optimized, and the accuracy of rotation speed was increased. As a result, the signal and noise ratio was improved and the magnetometer showed a high sensitivity and accuracy.

Original languageEnglish
Title of host publication2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013
DOIs
Publication statusPublished - Oct 15 2013
Event2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013 - Cambridge, MA, United States
Duration: Jul 7 2013Jul 11 2013

Publication series

Name2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013

Other

Other2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013
CountryUnited States
CityCambridge, MA
Period7/7/137/11/13

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Keywords

  • HTS-SQUID
  • magnetic susceptibility
  • magnetometer
  • rotating sample

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Hamasaki, D., Okamoto, N., Saari, M. M., Sakai, K., Kiwa, T., & Tsukada, K. (2013). Improvement of sensitivity for a compact magnetometer using HTS-SQUID with rotating sample. In 2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013 [6604306] (2013 IEEE 14th InternationalSuperconductive Electronics Conference, ISEC 2013). https://doi.org/10.1109/ISEC.2013.6604306