Abstract
High resistivity manganin or stainless steel wires have not been commonly used for SQUID neuromagnetometers because of their circuit mismatching and large thermal noise. Recently a new type of SQUID circuits has been developed. Using these circuits, it is possible to use high resistivity wires and hence decrease the evaporation loss of liquid helium in comparison with conventional systems with copper signal wires. In this paper, the relationship between the effective flux to voltage transfer ratio, the equivalent flux due to wire thermal noise and the evaporation loss of liquid helium is presented. Finally, the applications of manganin and copper wires are discussed.
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