An integrated planar gradiometer based on a double relaxation oscillation SQUID
Y H Lee; H C Kwon; J M Kim; Y K Park; J C Park; Y H Lee; Korea Research Institute of Standards and Science, PO Box 102, Yusong, Taejon, 305-600, Republic of Korea; H C Kwon; Korea Research Institute of Standards and Science, PO Box 102, Yusong, Taejon, 305-600, Republic of Korea; J M Kim; Korea Research Institute of Standards and Science, PO Box 102, Yusong, Taejon, 305-600, Republic of Korea; Y K Park; Korea Research Institute of Standards and Science, PO Box 102, Yusong, Taejon, 305-600, Republic of Korea; J C Park; Korea Research Institute of Standards and Science, PO Box 102, Yusong, Taejon, 305-600, Republic of Korea
Журнал:
Superconductor Science and Technology
Дата:
1996-04-01
Аннотация:
The design and performance of an integrated planar gradiometer based on a double relaxation oscillation SQUID (DROS) are presented. The DROS was made from hysteretic junctions and the devices were fabricated by a simple four-level process. The signal SQUID loop is a gradiometric type with two square holes connected in parallel and a reference junction is used instead of the reference SQUID. The high flux-to-voltage transfer coefficient of typically enabled direct readout by a simple electronics with a modest voltage noise. The pickup coil integrated on the same wafer as the SQUID consists of two planar coils connected in series and has a baseline of 30 mm. The overall size of the device is . The field gradient noise is in the white region and at 1 Hz.
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