SQUID-magnetometer with open-ended horizontal room-temperature access

Ultimate limitation of the SQUID magnetometer

The Superconducting QUantum Interference Device is used to detect weak biomagnetic signals since in the early seventies. In that time the measurement was based on point contact rf SQUIDs operated at 20 MHz, with to a flux noise of the order of 10-4 Φ 0/ √Hz . After finding methods to fabricate reliable thin-film devices, the dc SQUIDs started gradually replace the rf SQUIDs. [1] The dc SQUID wi...

Room-temperature detection of a single 19nm super-paramagnetic nanoparticle with an imaging magnetometer

Noninvasive Measurement of Gastric Propagation Using a Squid Magnetometer

A vector Superconducting QUuntum Interference Device (SQUID} magnetometer wus used to meusure the magnetic fields nssociated with propagation of gustric electrical uctivity. Measurements of the magnetic field vector were consistent with the presumed pattern of current propagation in the gastric musculature. Further studies using two SQUID systems ullowed the first noninvasive determination of t...

Four layer monolithic integrated high T, dc SQUID magnetometer

Y13aZCus0,-, based monolithic integrated dc SQUID magnetometers, consisting of a dc SQUID integrated with a flux transformer on a single bicrystalline substrate, have been fabricated and characterized. The devices consist of four layers, including two superconducting layers, and first realizations operate up to 73 K. A maximum voltage modulation of 32 ,u,V is observed at 40 K. A field sensitivi...

A 19-Channel d.c. SQUID Magnetometer System for Brain Research

A lPchanne1 d.c. SQUID magnetometer system for neuromagnetic investigations is under constuction. The first-order gradiometers for sensing the signal are placed in a hexagonal configuration. D.c. SQUIDS based on niobium/aluminium technology have been developed, leading to a field sensitivity of about 5 fT/JHz. SQUID read-out is realized with a resonant transformer circuit at 100 kI-Iz. The mult...