A two-dimensional current mapping in superconducting tapes

It is well known that the Hall probe magnetic imaging represents a powerful technique for the investigation of the magnetic field distribution in superconducting materials of many different types and geometries. In this report we present a new method of the evaluation of current distributions in thin superconducting tapes and films from the data of two-dimensional magnetic field profiles measured over the sample surface. We have analyzed standard algorithms of critical current calculation from the magnetic map and shown that the correct realization requires magnetic field mapping on the region in many times larger than the area of superconducting sample. To avoid this disadvantage we have developed a new modified calculation algorithm of two-dimensional 2D distribution of supercurrents. Realization of this modified algorithm needs sufficiently smaller area of measured magnetic field. An application of modified algorithm for 2D current mapping in superconductive tapes has shown a high efficiency of our approach. Obtained results may be used in real practical setup for quality control of commercial superconductors.