Fig. 4: Skyrmion size effect on flow dynamics.
From: Visualizing the strongly reshaped skyrmion Hall effect in multilayer wire devices
a Representative cropped MFM image (scale bar: 1 μm) at μ0H ≃ 75 mT showing the evolution in plastic flow of skyrmions with varying size dS. The smallest 25% (red) and largest 25% (blue) of dS are highlighted. Overlaid dots correspond to initial skyrmion positions and lines show the extent of motion. Zoomed insets at top and bottom (scalebar: 100 nm) show selected small (top, < 110 nm) and large (bottom, >170 nm) skyrmions for comparison. b Binned histogram distribution of skyrmions, NS, based on their size, dS—which varies over 80–200 nm (details in SM7). c 2D histogram color plot of skyrmion deflection, θS against dS for μ0H = 75 mT across all currents in the plastic flow regime. The data were binned by dS and normalized in each bin for this plot. Solid markers show the average deflection, 〈θS〉, for each dS bin. Average velocity 〈vS〉 (d) and angular deflection 〈θS〉 (e) for skyrmions in each dS-bin for J over (5.5–5.8) × 1011 A/m2. Shaded regions represent the standard deviation, also emphasized by error bars for selected points.
