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@ARTICLE{Liu:138405,
      author       = {Liu, Chao and Zhang, Yi and Mück, Michael and Zhang,
                      Shulin and Krause, Hans-Joachim and Braginski, Alexander and
                      Zhang, Guofeng and Wang, Yongliang and Kong, Xiangyan and
                      Xie, Xiaoming and Offenhäusser, Andreas and Jiang,
                      Mianheng},
      title        = {{S}tatistical characterization of voltage-biased {SQUID}s
                      with weakly damped junctions},
      journal      = {Superconductor science and technology},
      volume       = {26},
      number       = {6},
      issn         = {1361-6668},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2013-04539},
      pages        = {065002},
      year         = {2013},
      abstract     = {Recently, it has been shown that voltage-biased readout of
                      SQUIDs with weakly damped junctions (large
                      Stewart–McCumber parameter βc, due to high shunt
                      resistance) is useful for suppression of preamplifier noise.
                      We experimentally studied the characteristics of 53 planar
                      niobium–SQUID magnetometers with junction shunt resistors
                      RJ nominally of 30 Ω fabricated on 5 × 5 mm2 chips. The
                      field-to-flux transfer coefficient ∂B/∂Φ of the
                      magnetometers was 1.5 nT/Φ0, with a SQUID loop inductance
                      Ls of about 350 pH. The distributions of important SQUID
                      parameters, such as the current swing Iswing, the dynamic
                      resistance Rd, and the flux-to-voltage transfer coefficient
                      ∂V/∂Φ, are given. Nearly all the SQUIDs could be stably
                      operated in the voltage bias mode and their ∂V/∂Φ
                      reached a large mean value of 380 μV/Φ0. In this case, the
                      SQUIDs can be read out directly by a commercial operational
                      amplifier without any additional means to suppress
                      preamplifier noise. The mean flux noise of the SQUIDs was
                      found to be 4.5 μΦ0 Hz−1/2, corresponding to a field
                      resolution of 7 fT Hz−1/2. To demonstrate the
                      applicability of these SQUIDs in the direct readout scheme,
                      a simple four-channel SQUID gradiometer system was set up to
                      perform magnetocardiography and magnetoencephalography
                      measurements in a magnetically shielded room.},
      cin          = {PGI-8 / ICS-8 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-8-20110106 / I:(DE-Juel1)ICS-8-20110106 /
                      $I:(DE-82)080009_20140620$},
      pnm          = {423 - Sensorics and bioinspired systems (POF2-423) / 453 -
                      Physics of the Cell (POF2-453)},
      pid          = {G:(DE-HGF)POF2-423 / G:(DE-HGF)POF2-453},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000319664700002},
      doi          = {10.1088/0953-2048/26/6/065002},
      url          = {https://juser.fz-juelich.de/record/138405},
}