Figure 2.

Micromagnetic simulation of skyrmion‐bubbles generated via vertical current injection. a–c) Magnetization configurations at a μ₀ H_z magnitude of 0 mT (a), 100 mT (b), and 150 mT (c). The direction of magnetization is described by the color. d) Initial state with reversed magnetization by the Joule heating effect at the center; the red arrows indicate a symmetric spin–orbit torque force on the domain wall of the reversed magnetization by the radial current flow. e–i) Time‐dependent evolution of magnetization configurations. i) A bunch of skyrmion‐bubbles generated by the vertical current injection and radial current flow.