title: Femtotesla magnetic field measurement with magnetoresistive sensors.
abstract: The measurement of magnetic fields in the femtotesla (fT, 10(-15) tesla) range is important for applications such as magnetometry, quantum computing, solid-state nuclear magnetic resonance, and magnetoencephalography. The only sensors capable of detecting these very small fields have been based on low-temperature superconducting quantum interference devices operating at 4.2 kelvin. We present a magnetic field sensor that combines a superconducting flux-to-field transformer with a low-noise giant magnetoresistive sensor. The sensor can be operated up to 77 kelvin. Our small-size prototype provides the capability of measuring 32 fT.
authors.affiliation: SPEC/DRECAM, Commissariat a l'Energie Atomique Saclay, 91191 Gif-sur-Yvette, France. mp@drecam.saclay.cea.fr
authors.forename: Myriam
authors.initials: M
authors.lastname: Pannetier
authors.forename: Claude
authors.initials: C
authors.lastname: Fermon
authors.forename: Gerald
authors.initials: G
authors.lastname: Le Goff
authors.forename: Juha
authors.initials: J
authors.lastname: Simola
authors.forename: Emma
authors.initials: E
authors.lastname: Kerr