  In superconductors with three or more components, time-reversal symmetry may
be broken when the inter-component couplings are repulsive, leading to a
superconducting state with two-fold degeneracy. When prepared carefully there
is a stable domain wall on a constriction which connects two bulks in states
with opposite chiralities. Applying on external magnetic field, vortices in
different components dissociate with each other, resulting in a ribbon shape
distribution of magnetic field at the position of domain wall.
