Enhancing domain wall motion in magnetic wires by ion irradiation

The influence of low-energy He ion irradiation on the dynamics of a single Bloch domain wall was studied in magnetic wires based on Pt/Co/Pt trilayers exhibiting perpendicular anisotropy. The domain wall velocity is highly enhanced (up to three orders of magnitude) after irradiation at moderate fluence. A study in the thermally activated regime shows that this is consistent with a reduction of the density of pinning centers and of the pinning force. Uniform ion irradiation significantly improves domain wall motion, as required for future magnetic device