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Grebenchuk, S. Y., Hovhannisyan, R. A., Dremov, V. V., Shishkin, A. G., Chichkov, V. I., Golubov, A. A., . . . Stolyarov, V. S. (2020). Observation of interacting Josephson vortex chains by magnetic force microscopy. Physical Review Research, 2(2), Article ID 023105.
Open this publication in new window or tab >>Observation of interacting Josephson vortex chains by magnetic force microscopy
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2020 (English)In: Physical Review Research, E-ISSN 2643-1564, Vol. 2, no 2, article id 023105Article in journal (Refereed) Published
Abstract [en]

The ability to control Josephson vortices is instrumental for development of superconducting cryoelectronics. However, direct visualization of multivortex states in Josephson junctions is a challenging task. Here, we employ a magnetic force microscopy (MFM) for the analysis of planar Josephson junctions. We observe a specific MFM response, seen as a chain of small rings. By changing the applied field, we show that the number of rings is equal to the number of flux quanta in the junction. Therefore, each ring represents an individual vortex in a one-dimensional vortex chain within the junction. Our observation demonstrates that the MFM technique can be used for visualization of Josephson vortices and for probing their spatial configurations and mutual interaction.

National Category
Physical Sciences
urn:nbn:se:su:diva-191670 (URN)10.1103/PhysRevResearch.2.023105 (DOI)000602777500009 ()
Available from: 2021-03-30 Created: 2021-03-30 Last updated: 2022-02-25Bibliographically approved
Dremov, V. V., Grebenchuk, S. Y., Shishkin, A. G., Baranov, D. S., Hovhannisyan, R. A., Skryabina, O. V., . . . Stolyarov, V. S. (2019). Local Josephson vortex generation and manipulation with a Magnetic Force Microscope. Nature Communications, 10, Article ID 4009.
Open this publication in new window or tab >>Local Josephson vortex generation and manipulation with a Magnetic Force Microscope
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2019 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 10, article id 4009Article in journal (Refereed) Published
Abstract [en]

Josephson vortices play an essential role in superconducting quantum electronics devices. Often seen as purely conceptual topological objects, 2π-phase singularities, their observation and manipulation are challenging. Here we show that in Superconductor—Normal metal—Superconductor lateral junctions Josephson vortices have a peculiar magnetic fingerprint that we reveal in Magnetic Force Microscopy (MFM) experiments. Based on this discovery, we demonstrate the possibility of the Josephson vortex generation and manipulation by the magnetic tip of a MFM, thus paving a way for the remote inspection and control of individual nano-components of superconducting quantum circuits. 

Superconductivity, Josephson effect, Magnetic force microscopy, Vortices
National Category
Condensed Matter Physics
Research subject
Physics Of Matter
urn:nbn:se:su:diva-174875 (URN)10.1038/s41467-019-11924-0 (DOI)000483922400009 ()31488813 (PubMedID)2-s2.0-85071750654 (Scopus ID)
Available from: 2019-10-14 Created: 2019-10-14 Last updated: 2023-03-28Bibliographically approved

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