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Fourier analysis of the telegraph noise. (A) Skyrmion number in a 330-nm nanodisk jumps between 8 and 7 at a fixed magnetic field H = 0.98 kOe and temperature T = 260 K. (Inset) Images from Lorentz TEM show the configurations of the skyrmion cluster. (B) The amplitude spectrum of A, which exhibits no recognizable regularities. It is worth pointing out that this spectrum is not very accurate, because of the experiment timescale and insufficient time resolution of Lorentz TEM.
