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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.
ARM
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.
DC_SQUID
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 corresponding 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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