Fig. 3: Damped vortex gyration after switching off the current (fex = 101.5 MHz, j = 2.9 × 1011 A m−2).
From: Few-nm tracking of current-driven magnetic vortex orbits using ultrafast Lorentz microscopy
a Profiles of the vortex core along the x-axis, illustrating the damped sinusoidal motion towards the equilibrium position (scale bar: 200 nm). b Red: Tracked x-position of the vortex core as function of t (scale bar as in (a)). Blue/green: First/last result of the moving-window fit to the vortex trajectory. c Spatial vortex core trajectory during the damping. Spacing between the dots is 1 ns (scale bar: 100 nm). (c, Inset) Center of the gyration moving over time as determined from the fit (scale bar: 20 nm). d–f Fit results of the windowed fit. Shaded regions are one-sigma confidence intervals: (d) free oscillation frequency f0 as a function orbit diameter D. e Mean orbit diameter D over delay t. f Damping Γ as a function of the vortex core velocity vc.
