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Monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers

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5 Author(s)
Hilgenkamp, J.W.M. ; Dept. of Appl. Phys., Twente Univ., Enschede, Netherlands ; Brons, G.C.S. ; Hoogeveen, S. ; Flokstra, J.
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YBa/sub 2/Cu/sub 3/O/sub 7-x/ based monolithic flux transformer-coupled high-T/sub c/ DC SQUID magnetometers operating up to 73 K have been realized. The devices are characterized by high values of the modulation voltage, up to 32 /spl mu/V at 40 K. A minimal white noise level of 0.10 pT//spl radic/Hz was obtained above 200 Hz, and 0.64 pT//spl radic/Hz at 1 Hz and 55 K. The temperature dependence of the modulation voltage, the effective sensing area and the field sensitivity are discussed. Model-calculations have been performed to investigate high frequency resonances in the washer-input coil structure. Methods for damping are considered.<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )