Published in
American Institute of Physics, Applied Physics Letters, 13(81), p. 2406
DOI: 10.1063/1.1508419
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Operation of high-temperature superconductor magnetometer with submicrometer bicrystal junctions
,
M. I. Faley,
U. Poppe,
T. D. Poppe,
K. Urban,
V. Y.-U. Slobodchikov,
Y.-U. V. Maslennikov,
A. Gapelyuk,
B. Sawitzki,
A. Schirdewan
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Abstract
We investigated the noise properties of dc superconducting quantum interference device flip-chip magnetometers with submicrometer-wide bicrystal junctions operating at 77.4 K. The noise of the magnetometers with electronics was about 6 fT/rootHz at frequencies above 100 Hz increasing up to about 20 fT/rootHz at 1 Hz. The operation of the magnetometers was characterized in an electronic axial first order gradiometer system, which was employed for biomagnetic measurements. The system demonstrated a gradient resolution of about 1 fT/cmrootHz at 77.4 K and stable operation in a standard magnetically shielded room under clinical conditions. (C) 2002 American Institute of Physics.