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DC SQUID Rock Magnetometer

What is a SQUID?

SQUID is the abbreviation for Superconducting QUantum Interference Device

It consists of a superconducting ring that is interrupted in one place (rf-SQUID) or in two places (dc-SQUID) by a normal conductive or electrically isolating material. The gaps have to be very thin so that superconducting electron pairs (the Cooper-pairs) are able to tunnel the gap. Such tunnel contacts are called Josephson-contacts.
More information on WIKIPEDIA.


is the abbreviation of Anhysteretic Remanent Magnetization.

This type of magnetization is achieved by reducing the intensity of an alternating magnetic field in the presence of a small DC-bias field.

A 2G Enterprises, model 755R, 3-axis DC-SQUID rock magnetometer (WSGI / Applied Physics Systems ) is housed in the shielded room. It has a 2-axis degausser, a DC coil for ARM acquisition experiments, and an automatic sample handler. It is controlled by a personal computer running a LabVIEW programm.


SQUIDs are used to measure the very weak remanent magnetizations of materials, normally rocks or sediments. They have a sensitivity of much less then one flux quantum (2*10-15 Wb correspondingĀ  to a magnetic moment m= ca. 3*10-5 EMU or m= ca. 3*10-8Am2). A standard cylindrical rock sample has a diameter of 25.4 mm and a length of 22 mm.


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