Fig. 1: Micromagnetic simulation snapshots showing forward (left → right) and reverse (right → left) propagation of Néel skyrmions through an asymmetric T-junction diode for three target core diameters: ~ 20 nm, ~ 10 nm, and ~ 3 nm.

In forward bias, the skyrmion Hall effect steers skyrmions into the widening side of the junction, enabling forward transport. In reverse bias, Hall deflection toward the narrowed side; in all types of skyrmions, this leads to reflection back into the injection arm. Time Stamps indicate intervals between frames for each size case.