Observation of interacting Josephson vortex chains by magnetic force microscopy

Авторы: Grebenchuk Sergey Yu, Hovhannisyan Razmik A., Dremov Viacheslav V., Shishkin Andrey G., Chichkov Vladimir I., Golubov Alexander A., Dimitri Roditchev, Krasnov Vladimir M., Stolyarov Vasily S.
Журнал: Physical Review Research
Том: 2
Номер: 023105
Год издания: 2020
Первая страница: 023105-1
Последняя страница: 023105-6
DOI: 10.1103/PhysRevResearch.2.023105
Аннотация: The ability to control Josephson vortices is instrumental for development of superconducting microelectronics. 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.
Добавил в систему: Столяров Василий Сергеевич

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