Control of the interaction between pinning disorder and domain walls in Pt/Co/AlOx ultrathin films by He+ ion irradiation
Creators
- 1. University Grenoble Alpes, CNRS, Institut Néel, Grenoble 38042, France
- 2. Spin-Ion Technologies, 10 Boulevard Thomas Gobert, Palaiseau 91120, France and Centre de Nanosciences et de Nanotechnologies, CNRS, Université Paris-Saclay, 10 boulevard Thomas Gobert, Palaiseau 91120, France
- 3. Dep. de Engenharia Elétrica, Universidade Federal do Parana, Curitiba, Brazil
- 4. Laboratoire de Physique des Solides, Université Paris-Saclay, CNRS, Orsay 91405, France
Description
We have studied the effect of He+ irradiation on the dynamics of chiral domain walls in Pt/Co/AlOx trilayers in the creep regime. Irradiation leads to a strong decrease in the depinning field and a non-monotonous change of the effective pinning barriers. The variations of domain wall dynamics result essentially from the strong decrease in the effective anisotropy constant, which increases the domain wall width. The latter is found to present a perfect scaling with the length-scale of the interaction between domain wall and disorder, ξ. On the other hand, the strength of the domain wall–disorder interaction, fpin, is weakly impacted by the irradiation, suggesting that the length-scales of the disorder fluctuation remain smaller than the domain wall width.
Files
Balan APL 2023.pdf
Files
(620.0 kB)
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