Enhancing domain wall motion in magnetic wires by ion irradiation

Cayssol, F.; Menéndez, J. L.; Ravelosona, D.; Chappert, C.; Jamet, J.-P.; Ferré, J.; Bernas, H.
January 2005
Applied Physics Letters;1/10/2005, Vol. 86 Issue 2, p022503
Academic Journal
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 devices.


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