Basically, a susceptometer consists of a magnetizing (primary) coil and two pick-up (secondary) coils wound electrically in series opposition (Nikolo, 1995). The electro-motive force (emf) induced across ideal pick-up coils (i.e., wound with the same number of turns and in identical geometries) is zero in the absence of a sample. Inserting a magnetic sample centred in one of the secondary coils results in the generation of a non-zero signal that is directly proportional to the AC magnetic susceptibility.
In the experiment described here, the classical set-up is extended to measure simultaneously (i) the temperature against the top surface of the superconducting sample and (ii) the magnetic flux density against the bottom surface of the sample, as shown in Figure 1. In the following we describe the temperature sensors and the magnetic sensors.