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Josephson junctions with ferromagnetic barrier can have positive or negativecritical current depending on the thickness $d_F$ of the ferromagnetic layer.Accordingly, the Josephson phase in the ground state is equal to 0 (aconventional or 0 junction) or to $\pi$ ($\pi$ junction). When 0 and $\pi$segments are joined to form a "0-$\pi$ junction", spontaneous supercurrentsaround the 0-$\pi$ boundary can appear. Here we report on the visualization ofsupercurrents in superconductor-insulator-ferromagnet-superconductor (SIFS)junctions by low-temperature scanning electron microscopy (LTSEM). We discussdata for rectangular 0, $\pi$, 0-$\pi$, 0-$\pi$-0 and 20 \times 0-$\pi$junctions, disk-shaped junctions where the 0-$\pi$ boundary forms a ring, andan annular junction with two 0-$\pi$ boundaries. Within each 0 or $\pi$ segmentthe critical current density is fairly homogeneous, as indicated both bymeasurements of the magnetic field dependence of the critical current and byLTSEM. The $\pi$ parts have critical current densities $j_c^\pi$ up to$35\units{A/cm^2}$ at $T = 4.2\units{K}$, which is a record value for SIFSjunctions with a NiCu F-layer so far. We also demonstrate that SIFS technologyis capable to produce Josephson devices with a unique topology of the 0-$\pi$boundary.

Visualizing supercurrents in ferromagnetic Josephson junctions with various arrangements of 0 and \pi segments