Superconducting film flux transformer for a sensor of a weak magnetic field

We study a superconducting film flux transformer for the sensor of magnetic field. The sensor based on the giant magnetoresistance effect. We examined the topological nanostructuring of the flux transformer. We have increased of important parameters of a magnetic field sensor (∼2fT/Hz1/2). The object of study is a superconducting film flux transformer in the form of a square shaped loop with the tapering operative strip used in a sensor of a weak magnetic field. The magnetosensitive film element based on the giant magnetoresistance effect is overlapped with the tapering operative strip of the flux transformer and is separated from the latter by an insulator film. It is shown that the topological nanostructuring of the operative strip of the flux transformer increases its gain factor by one or more orders of magnitude, i.e. increases its efficiency, which leads to a significant growth of important parameters of a magnetic field sensor.