Superconducting SQUID

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A Superconducting Quantum Interference Device (SQUID) is a remarkably sensitive detector of minute magnetic fields. It consists of a superconducting loop with two "Josephson Junctions" (only one of which is labeled in the figure). The extreme sensitivity of SQUIDs as magnetometers makes them ideal for studies in medicine, such as magnetoencephalography, the measurement of neural activity inside human and animal brains, as well as being available commercially for the measurement of magnetic properties of materials. (Unit: 8)