IEEE Transactions on Applied Superconductivity · 1993 · 26 citations · 5 references
Natural SciencesElectrical EngineeringNeuroscienceElectromagneticsElectromagnetismMagnetic MaterialsMagnetic CharacterizationMagnetic Recording MaterialsMagnetic Thin FilmsSuperconducting Thin FilmsThin Film Magnetic PropertiesEpitaxial Magnetic FilmsEpitaxial Thin FilmsMagnetic Field MeasurementsMagnetic GradiometersMagnetic GradiometryMagnetoencephalographyQuantum InterferenceSquid Magnetometers
Low-noise RF superconducting quantum interference device (SQUID) washers fabricated from YBa/sub 2/Cu/sub 3/O/sub 7/ epitaxial thin films have been used to construct a first-order electronic gradiometer operating at 77 K and suitable for biomagnetic measurements. Mechanical adjustment of one SQUID's plane in a gradiometric setup, which consisted of two SQUIDs separated by a vertical 6-cm base, made it possible to attenuate signals due to far DC magnetic field sources by three orders of magnitude. A magnetic field resolution of 280 fT/ square root Hz above 2 Hz was attained through the use of large thin-film and bulk flux focusers. The fine structure of human-heart magnetocardiograms could be recorded in unshielded space. In a shielded room, magnetoencephalograms were obtained. The system was used to obtain new data on the acoustically evoked cortical response.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">></ETX>
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Low-noise YBa2Cu3O7 rf SQUID magnetometer
Yi Zhang, H.-M. Mück, K. Herrmann et al. · Applied Physics Letters · 1992 · 81 citations
YBa2Cu3O7−δ thin-film gradiometers: Fabrication and performance
W. Eidelloth, B. Oh, R. P. Robertazzi et al. · Applied Physics Letters · 1991 · 40 citations
Magnetoencephalography using high temperature rf SQUIDs
Y. Zhang, Y. Tavrin, M. M�ck et al. · Brain Topography · 1993 · 36 citations · Full text