Applications of HTSC SQUIDs

Abstract

Recently a high temperature superconductor (HTSC)-SQUID has been made with high magnetic field resolution and its application is expected to be practical for many fields. The HTSC-SQUID can work using liquid nitrogen which is handled much more easily than liquid helium, and thus a wide range of HTSC-SQUID applications is expected. This chapter describes recent HTSC-SQUIDs application researchs such as magnetocardiography, biological immunoassay, measurement of ultra low frequency to observe underground activities and a laser-SQUID microscope for LSI chip defects analysis.