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An illustrative fragment of the array showing the time evolution of the azimuthal (−2,0) mode at k = 0: This mode is almost stationary (“breathing”), apart from slight distortions due to the serrated shape of the disks (enhanced online). [URL: http://dx.doi.org/10.1063/1.4710549.1]10.1063/1.4710549.1
An illustrative fragment of the array showing the time evolution of the azimuthal (−2,0) mode at kx = 0.3 × (2π/a): The mode is now circularly polarized (enhanced online). [URL: http://dx.doi.org/10.1063/1.4710549.2]10.1063/1.4710549.2
Band diagram at H = 0. Inset on the left: first Brillouin zone and (blue square) irreducible zone. Inset on the right: snapshot of the (+2,0) mode turning into a (+3,0) mode at k = 16.8 × 104 rad/cm (along ΓX).
Band diagram at H = 200 Oe. Inset shows the equilibrium magnetic configuration of one of the disks of the array; the dark area corresponds to the vortex core region (out of plane).
Illustration of the symmetry breaking of the gyrotropic mode dispersion curve: dispersion curve at H = 0 (dotted line); dispersion curve at H = 200 Oe (solid line). The magnetic field is applied along x-direction.
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