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

Mijatovic, D. and Brinkman, A. and Veldhuis, D. and Hilgenkamp, H. and Rogalla, H. and Rijnders, A.J.H.M. and Blank, D.H.A. and Pogrebnyakov, A.V. and Redwing, J.M. and Xu, S.Y. and Li, Q. and Xi, X.X. (2005) SQUID magnetometer operating at 37K based on nanobridges in epitaxial MgB2 thin films. Applied Physics Letters, 87 (19). 192505/1-192505/3. ISSN 0003-6951

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Abstract:	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.
Item Type:	Article
Copyright:	© 2005 American Institute of Physics
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT) Inorganic Materials Science (IMS)
Link to this item:	http://purl.utwente.nl/publications/55176
Official URL:	http://dx.doi.org/10.1063/1.2128482
Publisher URL:	http://link.aip.org/link/?APPLAB/87/192505/1
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