Fig. 4
Micromagnetic simulations of spin-wave interferences. a–d Snapshots of the z-component of the magnetisation Mz of the corresponding stable states shown in Fig. 2. For better visibility the static contrast is subtracted and the contrast is oversaturated. The excitation frequency and field amplitude are frf = 6 GHz and μ0Hrf = 0.5 mT. The white arrows indicate the propagation direction of the short-wavelength spin-wave modes. a Antivortex state with equal polarisations in the stacks. b Antivortex state with different polarisations. c Diamond state with equal polarisations and d with opposing polarisations in the stacks. e, f Representation of the magnetisation of the vortex cores in one stack for equal (e) and opposite (f) polarisations and assigned wavelengths of the spin waves. Scale bar: 1 μm
