Abstract
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.
Highlights
Our observation demonstrates that the magnetic force microscopy (MFM) technique can be used for visualization of Josephson vortices and for probing their spatial configurations and mutual interaction
The MFM response is due to induction of JV dynamics by the oscillating MFM tip [28] and as such does not carry information about the JV structure or spatial distribution
We employ MFM for investigation of spatial distribution and mutual interaction of Josephson vortices in planar Josephson junctions
Summary
We observe a specific MFM response, seen as a chain of small rings. Our observation demonstrates that the MFM technique can be used for visualization of Josephson vortices and for probing their spatial configurations and mutual interaction.
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