N. Gronbechjensen et al., STABILITY OF BUNCHED FLUXONS IN MAGNETICALLY COUPLED JOSEPHSON-JUNCTIONS, Physical review. B, Condensed matter, 48(21), 1993, pp. 16160-16163
The stability of bunched fluxon states in inductively coupled Josephso
n junctions is analyzed for fluxons of both equal and opposite polarit
y. We demonstrate that unipolar fluxons may form stable bunched states
if the velocity is above a given threshold. The stability of these bu
nched states is based on the existence of two characteristic velocitie
s in the coupled system. The result of analytical stability analysis i
s in excellent agreement with the results of numerical simulations.