Abstract
A combined magnetic field sensor is described. The sensor consists of a magnetically sensitive element based on giant magnetoresistance structure and a superconducting film magnetic field concentrator. Fragmentation (nanostructuring to a branch width of 20-350 nm) of an active strip (narrow part) of the magnetic field concentrator in numerous branches and slits and modeling of their sizes (nanosizes) and locations allow the concentration coefficient and sensor efficiency to be increased by 1-2 orders of magnitude (resolution ≤ 10 pT). The efficiency of the magnetic field concentrator can be further increased if low-temperature superconductor films are used instead of high-temperature superconductor. The parameters of the suggested sensor and SQUIDs are compared.
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