Electronic Resource
Drung, D.
;
Dantsker, E.
;
Ludwig, F.
;
[et al.]
Koch, H.
;
Kleiner, R.
;
Clarke, John
;
Krey, S.
;
Reimer, D.
;
David, B.
;
Doessel, O.
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
68 (1996), S. 1856-1858
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Three magnetometers based on dc superconducting quantum interference devices (SQUIDs) fabricated from YBa2Cu3O7−x have been operated in a magnetically shielded room using a flux-locked loop involving additional positive feedback with bias current reversal. Two of these devices, integrated multiloop dc SQUIDs with outer diameters of 7 mm, achieved white noise levels of 10 fT/(square root of)Hz for bicrystal junctions and 30 fT/(square root of)Hz for step-edge junctions. The third magnetometer involved a flux transformer with a 10×10 mm2 pickup coil connected to a 16-turn input coil which was inductively coupled to a bicrystal SQUID. This device achieved a white noise of 16.2 fT/(square root of)Hz. High quality magnetocardiograms were obtained without signal averaging. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.116036
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