A New Generation of the HTS Multilayer DC-SQUID Magnetometers and Gradiometers
作者： M I Faley , U Poppe , K Urban , D N Paulson , R L Fagaly
DOI: 10.1088/1742-6596/43/1/292
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摘要: We have optimized the preparation of submicrometer wide symmetric 20° bicrystal Josephson junctions on basis YBa2Cu3O7−x (YBCO) films and integrated them in SQUID magnetometers gradiometers with multilayer flux transformers. The achieved reduction curvature grain boundary leads to an improvement homogeneity current flow junction due d-wave symmetry order parameter YBCO. typical normal resistance Rn above 10 Ω a IcRn product about 0.4 mV at 77.4 K. high has required extensive use low pass filters, rf-shields microwave absorbers protect from increased interference frequency electromagnetic fields. Integration such square 16-mm transformer allowed us for first time reach field resolution 3.5 fT/√Hz frequencies Hz 7 1 operation temperature mm base length planar resolutions 15 fT/cm√Hz 30
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