Characteristics of directly-coupled single -layer second-order high Tc SQUID gradiometer
- Hwang, Yun-Seok (Korea University, Korea Research Institute of Standards and Science) ;
- Moon, Sunk-Yung (Korea University) ;
- Ahn, Jong-Rok (Korea University) ;
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Lee, Soon-Gul
(Korea University)
;
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Kim, Jin-Tae
(Korea Research Institute of Standards and Science)
- Published : 2000.08.16
Abstract
We have fabricated directly-coupled single-layer second-order high-Tc SQUID gradiometer. The gradiometer consisted of 3 parallel-connected square pickup loops, and each loop was directly coupled to SQUID. YBCO thin film was deposited by pulsed laser deposition and patterned by photolithography with ion milling technique. Optimum balancing condition was achieved by varying the outer diameter of the center loop. We have investigated nearly zero response of the SQUID to uniform and 1 st-order field gradient.