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000138405 0247_ $$2doi$$a10.1088/0953-2048/26/6/065002
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000138405 037__ $$aFZJ-2013-04539
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000138405 1001_ $$0P:(DE-Juel1)143659$$aLiu, Chao$$b0$$eCorresponding author
000138405 245__ $$aStatistical characterization of voltage-biased SQUIDs with weakly damped junctions
000138405 260__ $$aBristol$$bIOP Publ.$$c2013
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000138405 520__ $$aRecently, 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.
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000138405 7001_ $$0P:(DE-Juel1)128754$$aZhang, Yi$$b1
000138405 7001_ $$0P:(DE-HGF)0$$aMück, Michael$$b2
000138405 7001_ $$0P:(DE-HGF)0$$aZhang, Shulin$$b3
000138405 7001_ $$0P:(DE-Juel1)128697$$aKrause, Hans-Joachim$$b4
000138405 7001_ $$0P:(DE-Juel1)128664$$aBraginski, Alexander$$b5$$ufzj
000138405 7001_ $$0P:(DE-HGF)0$$aZhang, Guofeng$$b6
000138405 7001_ $$0P:(DE-HGF)0$$aWang, Yongliang$$b7
000138405 7001_ $$0P:(DE-HGF)0$$aKong, Xiangyan$$b8
000138405 7001_ $$0P:(DE-HGF)0$$aXie, Xiaoming$$b9
000138405 7001_ $$0P:(DE-Juel1)128713$$aOffenhäusser, Andreas$$b10
000138405 7001_ $$0P:(DE-HGF)0$$aJiang, Mianheng$$b11
000138405 773__ $$0PERI:(DE-600)1361475-7$$a10.1088/0953-2048/26/6/065002$$gVol. 26, no. 6, p. 065002 -$$n6$$p065002$$tSuperconductor science and technology$$v26$$x1361-6668$$y2013
000138405 8564_ $$zPublished final document.
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