Development of a thin-film high-temperature superconductor Hall magnetometer

We have developed and investigated a thin-film Hall sensor coupled with a high-T-C superconducting antenna structure. In this paper we present a theoretical model from which we can derivate the criteria for the layout and the technological realization of the sensor system. The model describes the improvement in the sensitivity of the magnetometer system by a superposition of the external field and an inductive incoupling of a field generated from the superconducting antenna. Based on the theoretical results it is possible to realize a hybrid magnetometer with a sensitivity of about 2.3 V T-1 and with a field resolution of about 1 nT Hz(-1/2) at a temperature of 77 K.