Patent ID: 7705590

Claim:
A SQUID arrangement for measuring a change in a magnetic field, comprising: a squid configuration having two superconducting current loops, the current loops comprising a common line portion common to each of the two loops, the common line portion being interrupted with two Josephson junctions; said current loops being configured to provide one closed superconducting path chat does not run through said common line and said Josephson junctions; said one closed superconducting path including a superconducting switch position to open said one closed superconducting path, and a current source connected to said one closed superconducting path configured to inject a persistent current during opening of the superconducting switch; said one closed current path being configured to produce a magnetizing field in a specimen area; and a specimen disposed in the specimen area and having a susceptance characteristic which changes in response to an outside influence such chat a change in a magnetic field is caused by the specimen that is arranged in the magnetization field and is detected by the squid configuration.