Fig. 1: Schematic of DWs and skyrmions, and the corresponding LTEM images.

a Magnetic structure of DWs in ferromagnets. b, c Corresponding LTEM images of DWs for underfocused (b) and overfocused (c) conditions. d Magnetic structure of skyrmions. e, f Corresponding LTEM images of skyrmions for underfocused (e) and overfocused (f) conditions.