title: A three-axis SQUID-based absolute vector magnetometer.
abstract: 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.
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Schönau
authors.affiliation: Supracon AG, An der Lehmgrube 11, Jena 07751, Germany.
authors.forename: V
authors.initials: V
authors.lastname: Zakosarenko
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Schmelz
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Stolz
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Anders
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Linzen
authors.affiliation: Supracon AG, An der Lehmgrube 11, Jena 07751, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Meyer
authors.affiliation: Department of Quantum Detection, Leibniz Institute of Photonic Technology, Jena 07745, Germany.
authors.forename: H-G
authors.initials: HG
authors.lastname: Meyer