A TlBaCaCuO Thin Film Planar dc-Squid Magnetometer
CHEN Lie, ZHANG Lihua, WENG Yaojun, YANG Tao1, LIU Dong1, SHAO Kai2, YAN Shaolin3
Institute of Physics, Academia Sinica, Beijing 100080
1also Department of Physics, Northwest University, Xi’an 710069
2Nanjing Electronic Devices institute, Nanjing 210026
3Department of Electronic, Nankai University, Tianjin 300071
A TlBaCaCuO Thin Film Planar dc-Squid Magnetometer
Institute of Physics, Academia Sinica, Beijing 100080
1also Department of Physics, Northwest University, Xi’an 710069
2Nanjing Electronic Devices institute, Nanjing 210026
3Department of Electronic, Nankai University, Tianjin 300071
Abstract： A superconducting quantum interference device (squid) was made from TlBa-CaCuO(TBCCO) thin film. The squid loop forms a part of the pickup loop. The squid hole is a square of about 100x100μm. The pickup loop and the squid loop inductances are estimated to be 11 nH and 190pH, respectively. The best value of equivalent flux noise as measured in the flux locked loop mode is 4x10-4 Ф0 / Hz1/2 at dc-1 Hz. The corresponding sensitivity resolution at this frequency is 9pT/Hz1/2, about a factor 8 higher than the squid loop area.
1993, Vol. 10 
