Fig. 2. MFM measurements at room temperature.

(A to G) MFM images of an FCGT nanoflake on a SiO₂/Si substrate with different thicknesses (scale bar, 2 μm). The thickness was measured by atomic force microscopy. (H) Domain size as a function of the FCGT thickness. The skyrmion size strongly depends on flake thickness. The dotted line is a fit to Kittel’s law. The micromagnetic simulation results also follow Kittel’s law (yellow circles).