B David et al 1996 Supercond. Sci. Technol. 9 A96 doi:10.1088/0953-2048/9/4A/025
High-
SQUID magnetometers for biomagnetic measurements
B David
, D Grundler
, S Krey, V Doormann, R Eckart, J P Krumme, G Rabe and O Doessel
We have designed and fabricated three types of high-
SQUID (superconducting quantum interference device) magnetometers based on step-edge Josephson junctions using three different concepts of coupling magnetic flux into the SQUID: (i) a single pickup loop galvanically coupled to the SQUID, (ii) a flux transformer inductively coupled to the SQUID and (iii) a multiloop pickup loop used directly as the SQUID inductance. On a 
substrate we achieved an effective flux capture area of 
and 
for the inductively coupled and multiloop devices, respectively. Due to the low white noise levels of 
for the inductively coupled magnetometer and 
for the multiloop device high quality magnetocardiograms were recorded inside a magnetically shielded room without signal averaging.
- PACS
-
85.25.Dq Superconducting quantum interference devices (SQUIDs)
07.55.Ge Magnetometers for magnetic field measurements
87.80.-y Biophysical techniques (research methods)
87.50.C- Static and low-frequency electric and magnetic fields effects
- Subjects
- Dates
-
Issue 4A (April 1996)
Received 18 October 1995, in final form 28 November 1995
-
High- SQUID magnetometers for biomagnetic measurements
B David et al 1996 Supercond. Sci. Technol. 9 A96
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