Hi all,

I am plotting spin wave spectra from magnetic nanodisks in the vortex state through mumax and I can see some modes are excited at high frequencies (>10 GHz). According to the frequency domain, they are related to radial spin waves, but my question is, where do these spin waves come from (wihtin the disk)? I can get a dispersion diagram, just plotting the K-space through a spatial 2D FFT, and first, I focus in a specific frequency laying on that high frequency range, where I can see a shady, weak, and continuous dispersion line...

When I excite the same disk with a continuous wave at that frequency, I see in time domain a lot of spin waves emmitted from the edges, but nothing related with the nice circular wave mode from the FFT plots...

Is it that the mode is so weak that it gets shadowed by others? Why the other waves are being excited and how could I get rid of them? I only want to check if that radial spin wave is propagating from somewhere or not..

Many thanks for your help, I am struggling s little bit with this.