  We report on a micromagnetic simulation study of coupled core gyrations in
one-dimensional (1D) alternating vortex-antivortex (V-AV) lattices formed in
connected soft-magnetic-disk arrays (round-shaped modulated nanostrips). In the
V-AV lattices, we found very characteristic standing-wave modes of the coupled
gyrations as well as efficiently ultrafast gyration-signal propagation between
vortices through the neighboring antivortices, as originating from their
combined strong exchange and dipole interactions. Collective core oscillations
in the V-AV networks are characterized as unique two-branch magnonic bands that
are affected by the polarization ordering between the neighboring vortex and
antivortex and controllable by externally applied perpendicular fields each of
different field strength and direction. The gyration-signal propagation speed
is much faster than that for 1D disk arrays composed only of vortex states, and
the propagation speed for the parallel polarization ordering is increased,
remarkably, to more than 1 km/sec by application of perpendicular static
fields. This work provides a fundamental understanding of the coupled dynamics
of topological solitons as well as an additional mechanism for ultrafast
gyration-signal propagation; moreover, it offers an efficient means of
significant propagation-speed enhancement that is suitable for information
carrier applications in continuous nanostrips.
