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Electromigration‐induced radially symmetric flow. a) Schematic illustration of the experimental setup for passing an electric current through a thin Cr film deposited on a substrate. b) An optical image showing formation of a typical electromigration ring around the cathode probe (solid black parts are needle probes). The ring is created on a 20 nm Cr film deposited on a SiO2‐Si substrate. Reproduced from Ref. 48 with permission of Nature Publication Group.
