Fig. 4: Micromagnetic simulations of the magnon generation by a moving fluxon lattice.
From: Moving Abrikosov vortex lattices generate sub-40-nm magnons
a–c, Dispersion curves for magnons at Hext = 1.85 T and the vortex lattice moving with different velocities in the submagnonic regime (a), magnonic regime I (b) and magnonic regime II (c). d, Dependence of the phase (vph) and group (vg) velocities of magnons on the wavenumber k. In the submagnonic regime (shaded region), there is no magnon generation. Magnonic regime I corresponds to a monochromatic and unidirectional magnon excitation at the frequency and momentum matching condition, vVL = vSW = vph = vg and kVL = kSW, respectively. In magnonic regime II, two spin waves are generated, moving in the same direction as the vortex lattice, one in front of it and one behind it. e, Magnon frequency spectra in the detection area for the three vortex lattice velocity values. Multiplication factors are indicated next to the spectra. f–h, Generation and propagation of spin waves in the Co–Fe conduit in the magnonic regime II (f) and magnonic regime I (g) in comparison with the submagnonic regime (h) where no spin wave is generated.
