Development of SQUID–VCM magnetic measurement system for pressure experiment

Abstract Superconducting quantum interference device (SQUID) is a powerful tool, which can detect small magnetic signal with high sensitivity, but it is not easy to make use of the SQUID. Especially in the case of the pressure experiment, it is more difficult to utilize the SQUID due to the space limitation of the coil arrangement. We are trying to establish the vibrating coil magnetometer (VCM) using the SQUID, and our attempt started from the imitating of Ishizuka type of VCM. In the development process, we have developed the original method of coil vibration control and real-time phase-detection system. As the performance test, the superconducting transition of lead was observed in some conditions, and the present sensitivity was confirmed to be about 10 −8 emu at earth field.