skip to main content

Title: 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{sup 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.
Authors:
; ; ; ; ;  [1] ; ;  [2]
  1. Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745 (Germany)
  2. Supracon AG, An der Lehmgrube 11, Jena 07751 (Germany)
Publication Date:
OSTI Identifier:
22482572
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 86; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; AMPLITUDES; CRITICAL TEMPERATURE; ELECTRIC POTENTIAL; JOSEPHSON JUNCTIONS; MAGNETIC FIELDS; MAGNETOMETERS; NOISE; OPERATION; SQUID DEVICES; STABILITY