Title :
A SQUID magnetometer using a niobium thin-film microbridge
Author :
Ibuka, M. ; Hosomatsu, H. ; Naito, Sei
Author_Institution :
Yokogawa Electric Works Ltd., Tokyo, Japan
Abstract :
A new type of superconducting quantum interference device (SQUID) using a submicrometer-width niobium thin-film microbridge on a sapphire substrate is described. This thin-film SQUID is suitable for mass production. It is mechanically rigid and resists mechanical shock and heat cycling. The SQUID is mounted in a niobium two-hole superconductive ring block to decrease its inductance, and an energy resolution of 5×10-29 J/Hz is obtained. A magnetometer comprising this SQUID and gradiometer-type search coils as well as a magnetically shielded room used to measure magnetocardiograms are described.
Keywords :
biomagnetism; biomedical electronics; biomedical equipment; magnetic thin film devices; magnetometers; superconducting junction devices; SQUID; biomagnetic applications; gradiometer-type search coils; magnetic thin film devices; magnetically shielded room; magnetocardiograms; magnetometer; sapphire substrate; submicrometer-width niobium thin-film microbridge; superconducting quantum interference device; Magnetic flux; Magnetic noise; Magnetic shielding; Magnetic tunneling; Magnetometers; SQUIDs; Superconducting magnets;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.1981.6312401
