Vibrating sample magnetometer with SQUID
●The superconducting quantum interference device (SQUID) can be used as a flux to voltage converter in the VSM magnetometer.
●The sample vibrates between pick-up coils placed in an external magnetic field
●The coils are connected so as to insure that the change in the applied field produces no net flux in the coils (second order gradiometer [7])
●The coils are coupled inductively to SQUID element which converts flux changes caused by the movement of the sample to voltage
●The voltage is measured with lock-in principle
●The sensitivity of commercial VSMs wit SQUID can exceeds 10-11Am2 *.(It corresponds roughly to 0.1mm0.1mm1nm piece of iron)
●Resolution is field dependent (noise from field source)