you may be familiar with the magnetic loop antenna. It’s different from most conventional wire antennas, taking the form of a tuned circuit with a very large single-turn coil and a tuning capacitor.

When an electric current passes through a metal wire, a magnetic ... the stronger field, more current flows, which increases the field still further. This self-sustaining loop is known as the ...

RF SQUID: An RF SQUID has a single Josephson junction in a superconducting loop, coupled to a radio-frequency (RF) circuit. The external magnetic field modulates the inductance of the loop, which is ...