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Four layer monolithic integrated high Tc dc SQUID magnetometer

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6 Author(s)
Hilgenkamp, J.W.M. ; Department of Applied Physics, University of Twente, P. O Box 217, 7500 AE Enschede, The Netherlands ; Brons, G.C.S. ; Soldevilla, J.G. ; Ijsselsteijn, R.P.J.
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YBa2Cu3O7-x based monolithic integrated dc SQUID magnetometers, consisting of a dc SQUID integrated with a flux transformer on a single bicrystalline substrate, have been fabricated and characterized. The devices consist of four layers, including two superconducting layers, and first realizations operate up to 73 K. A maximum voltage modulation of 32 μV is observed at 40 K. A field sensitivity of 0.17 pT/√Hz is obtained above 200 Hz at 45 K and 0.49 pT/√Hz at 1 Hz and 65 K.

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Applied Physics Letters  (Volume:64 ,  Issue: 25 )