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Planar Superconductor-Ferromagnet-Superconductor Josephson Junctions as Scanning-Probe Sensors
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics. Moscow Institute of Physics and Technology, State University, Russia.
Number of Authors: 32019 (English)In: Physical Review Applied, E-ISSN 2331-7019, Vol. 11, no 1, article id 014062Article in journal (Refereed) Published
Abstract [en]

We propose a magnetic scanning-probe sensor based on a single-planar Josephson junction with a magnetic barrier. The planar geometry together with the high magnetic permeability of the barrier facilitates a double flux-focusing effect, which helps to guide magnetic flux into the junction and thus enhances field sensitivity of the sensor. We fabricate and analyze experimentally sensor prototypes with a superparamagnetic Cu-Ni and a ferromagnetic Ni barrier. We demonstrate that the planar geometry allows easy miniaturization to nanometer scale and facilitates an effective utilization of the self-field phenomenon for amplification of sensitivity and a simple implementation of a control line for feedback operation over a broad dynamic range. We argue that the proposed sensor can outperform equally sized superconducting quantum-interference devices (SQUIDs) both in terms of magnetic-field sensitivity and spatial resolution, which makes it advantageous for scanning-probe microscopy.

Place, publisher, year, edition, pages
2019. Vol. 11, no 1, article id 014062
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-166785DOI: 10.1103/PhysRevApplied.11.014062ISI: 000457141300003OAI: oai:DiVA.org:su-166785DiVA, id: diva2:1295706
Available from: 2019-03-12 Created: 2019-03-12 Last updated: 2019-03-12Bibliographically approved

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