DESIGN AND FABRICATION OF A MULTILOOP SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE, THE CLOVER-LEAF SUPERCONDUCTING QUANTUM INTERFERENCE DEVICE

被引:3
|
作者
MATSUDA, N [1 ]
UEHARA, G [1 ]
KAZAMI, K [1 ]
TAKADA, Y [1 ]
KADO, H [1 ]
机构
[1] ELECTROTECH LAB, TSUKUBA 305, JAPAN
关键词
SQUID; MULTILOOP; DRUNG-TYPE SQUID; CLOVER-LEAF SQUID; APF; ASYMMETRIC BIAS; MEG;
D O I
10.1143/JJAP.34.L27
中图分类号
O59 [应用物理学];
学科分类号
摘要
Reducing the number of loops in a Drung-type superconducting quantum interference device (SQUID) from eight to four minimally reduces the voltage swing. A four-loop SQUID, called a clover-leaf SQUID (CLS), has been designed in order to reduce the area of the SQUID chip. The CLSs are fabricated by the Nb/Al/AlOx/Nb tunnel junction process. They occupy a 4.5-mm-square area on the substrate and have high field-to-flux sensitivity (S = 0.63 nT/PSI0). Typical magnetic field resolution is 4.0 fT/Hz0.5 at the white-noise level. The measured biomagnetic fields of this SQUID confirm that its performance level is acceptable.
引用
收藏
页码:L27 / L30
页数:4
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