A three-axis SQUID-based absolute vector magnetometer.


We report on the development of a three-axis absolute vector magnetometer suited for mobile operation in the Earth's magnetic field. It is based on low critical temperature dc superconducting quantum interference devices (LTS dc SQUIDs) with sub-micrometer sized cross-type Josephson junctions and exhibits a white noise level of about 10 fT/Hz(1/2). The width of superconducting strip lines is restricted to less than 6 μm in order to avoid flux trapping during cool-down in magnetically unshielded environment. The long-term stability of the flux-to-voltage transfer coefficients of the SQUID electronics is investigated in detail and a method is presented to significantly increase their reproducibility. We further demonstrate the long-term operation of the setup in a magnetic field varying by about 200 μT amplitude without the need for recalibration.

DOI: 10.1063/1.4933386

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@article{Schoenau2015ATS, title={A three-axis SQUID-based absolute vector magnetometer.}, author={Thomas Schoenau and Vyatcheslav Zakosarenko and Melanie Schmelz and Roswitha Stolz and Solveig Anders and S. Linzen and Marshall Meyer and H-G Meyer}, journal={The Review of scientific instruments}, year={2015}, volume={86 10}, pages={105002} }