SQUID magnetometer operating at 37K based on nanobridges in epitaxial MgB2 thin films

D. Mijatovic, Alexander Brinkman, Dick Veldhuis, Johannes W.M. Hilgenkamp, Horst Rogalla, Augustinus J.H.M. Rijnders, David H.A. Blank, A.V. Pogrebnyakov, J.M. Redwing, S.Y. Xu, Q Li, X.X. Xi

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Superconducting quantum interference devices SQUIDs and magnetometers are fabricated from nanoconstrictions in epitaxial MgB2 films. The nanobridges are contained within single-crystalline grains, resulting in clean transport, a large critical current density of 5107 A/cm2 at 4.2 K, and stable SQUID voltage modulation up to 38.8 K. The magnetometer is realized with an inductively coupled pickup loop, giving rise to a field sensitivity of 1 pT Hz¿1/2 down to 1 Hz. The device properties are governed by the two-band superconducting nature of MgB2, posing, however, no problems to a successful development of boride magnetic field sensing devices. The MgB2 zero-temperature London penetration depth is measured to be 62 nm, close to theoretical predictions.
Original languageUndefined
Pages (from-to)192505
Number of pages3
JournalApplied physics letters
Issue number192505
Publication statusPublished - 2005


  • EWI-19272
  • IR-55176
  • METIS-230356

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