Fig. 4
From: Imaging of super-fast dynamics and flow instabilities of superconducting vortices
Vortex velocities and spacing along the entrance stem channel. a Spacing between successive vortices a(x) along the stem from x = 0.5 µm up to the bifurcation point x b at B a = 2.7 mT at various indicated currents. Inset: SEM image of the sample with marked x axis. The scale bar is 2 µm. b Corresponding vortex velocities v(x) along the stem from x = 0.5 µm up to the bifurcation point x b. c The vortex velocity vs. current at x = 0.5 µm (black) and at x b (blue). The dashed lines are guides to the eye. d Vortex spacing a c at the bifurcation point x b vs. the voltage V across the microbridge (blue), compared to the theoretical estimate (dashed) based on the thermal confinement model
