Magnetic Field Concentrator Based on the Superconducting Films with Nanosize Cuts

• Published in: Journal of physics. Conference series Vol. 1182; no. 1; pp. 12007 - 12014
• Main Authors: Ichkitidze, L P, Belodedov, M V, Selishchev, S V, Telishev, D V
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.02.2019
• Subjects: Bismuth strontium calcium copper oxide; Concentrators; Magnetic fields; Mathematical analysis; Niobium; Penetration depth; Sensors; Strip; Superconducting films; Superconductivity; YBCO superconductors
• ISSN: 1742-6588; 1742-6596
• DOI: 10.1088/1742-6596/1182/1/012007

Optimal active strip nanostructuring of a magnetic field concentrator based on superconducting films allows to further increase the concentration ratio of the device. The magnetically sensitive element was placed between two concentrator rings lying in the same plane without crossing. Calculated concentration coefficients F and F0 of a planar concentrator with an active strip with nanosize cuts and without them. Different position of the cuts in the active strip of the concentrator were invastigated, as well as different values of the magnetically sensitive element width w0 and the London penetration depth λ. In the calculations it was assumed that the width of the cut wp coincides with the distance wa between the ends of the near concentrator and magnetically sensitive element. The active strip width ws and width of the superconducting branch were multiples of wa . It turned out that as w0 decreases, F0 increases and F decreases but the total concentration coefficient F* = F0F increases. F* value for a concentrator based on the niobium film (λ ∼ 50nm ) is higher than for the concentrator based on films Y-123 or Bi-2223 (λ ≥ 250nm). The considered concentrator with nanosize cuts will increase the efficiency of combined magnetic field sensors, SQUIDs, and other sensors with a resolution of ≤ 1 pT.