Integrated YBa2Cu3O7−<i>x</i> magnetometer for biomagnetic measurements

Drung, D.; Ludwig, Frank; Müller, Wolfgang; Steinhoff, Uwe; Trahms, Lutz; Koch, H.; Shen, Y.Q.; Jensen, M. B.; Vase, P.; Holst, T.; Freltoft, T.; Curio, Gabriel

doi:10.1063/1.116100

Cited by 110 publications

(52 citation statements)

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“…This problem can be solved, if we relate the critical current with bias current I MAX , which can be measured directly in SQUID scheme. The idea was realized in the paper 14 , where, based on the numerical simulations of the paper 16 , the following approximate expression for I MAX has been suggested:…”

Section: B Critical Currentmentioning

confidence: 99%

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The voltage–current characteristic of high-TC DC SQUID: Theory, simulation, experiment

Greenberg

Novikov

2006

Physica C: Superconductivity

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The analytical theory for the voltage-current characteristics of the large inductance (L > 100pH) high-TC DC SQUIDs that has been developed previously is consistently compared with the computer simulations and the experiment. The theoretical voltage modulation for symmetric junctions is shown to be in a good agreement with the results of known computer simulations. It is shown that the asymmetry of the junctions results in the increase of the voltage modulation if the critical current is in excess of some threshold value (about 8µA). Below this value the asymmetry leads to the reduction of the voltage modulation as compared to the symmetric case. The comparison with the experiment shows that the asymmetry can explain a large portion of experimental values of the voltage modulation which lie above the theoretical curve for symmetric DC SQUID. It also explains experimental points which lie below the curve at small critical currents. However, a significant portion of these values which lie below the curve cannot be explained by the junction asymmetry.

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Section: B Critical Currentmentioning

confidence: 99%

“…The practical importance of asymmetric DC SQUIDs is that they have a higher transfer function (the slope of the voltage-to-flux curve) as compared to the symmetric case 10,11,12,13,14 . This property is generally attributed to the distortion of the voltage-to-flux curve.…”

Section: Asymmetric DC Squidmentioning

confidence: 99%

The voltage–current characteristic of high-TC DC SQUID: Theory, simulation, experiment

Greenberg

Novikov

2006

Physica C: Superconductivity

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“…As described in Parts I and 111, a magnetometer consisting of a square-washer SQUID inductively coupled to a flux transformer in either a flipchip [45] or integrated [64] arrangement combines high magnetic field sensitivity with small sensor size. The outer dimension of the SQUID washer is usually made large, say 500 pm, to facilitate efficient coupling to the multiturn input coil.…”

Section: Large-area Wbsher Squidsmentioning

confidence: 99%

High transition-temperature SQUID magnetometers and practical applications

Dantsker

1997

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“…High-T c DC-SQUID magnetometers have achieved field resolutions better than 10 fT/ Hz at an operation temperature of 77.4 K [3,4,5]. Such high-T c magnetometers can be combined in electronic gradiometer systems with gradient resolution 1 fT/cm Hz at 77.4 K to obtain medically useful biomagnetic data in a clinical environment inside a standard magnetic shielded room having a shielding factor as low as 10 at 0.1 Hz (see, e.g., [6]).…”

Section: Introductionmentioning

confidence: 99%