ISSN:
1573-6792
Keywords:
High-temperature superconductor
;
Thin-film
;
SQUID
;
Biomagnetism
;
Diagnostics
;
Magnetoencephalography
;
Auditory evoked fields
Source:
Springer Online Journal Archives 1860-2000
Topics:
Medicine
Notes:
Summary We have developed high-critical-temperature radio-frequency Super conducting QUantum Interference Devices (SQUIDs) with step-edge grain-boundary Josephson junctions and large flux focusers. These planar devices were fabricated from epitaxial YBa2Cu3O7 films and operated in the magnetometer and first-order gradiometer configurations while immersed in liquid nitrogen. At the temperature of 77K, we have attained a magnetic field resolution for the magnetometer better than 200 fT/Hz1/2 down to less than 1 Hz, i.e., over the low signal frequency range important for medical diagnostics. The results to date show a high promise for biomagnetic diagnostics. For the first time, we recorded the evoked responses from human brains using a high-temperature magnetometer and a first-order electronic gradiometer channel simultaneously. These results were obtained in a magnetically shielded room. An improvement in the magnetic field resolution by another order of magnitude is possible and probable.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01128694
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