SQUID magnetometer operating at 37 K based on nanobridges in epitaxial MgB 2 thin films

D. Mijatovic, A. Brinkman, D. Veldhuis, H. Hilgenkamp, H. Rogalla, G. Rijnders, D. 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 5× 107 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-12 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 languageEnglish (US)
Article number192505
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Issue number19
StatePublished - Nov 7 2005

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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