Controlling magnetic skyrmion nucleation with Ga+ ion irradiation

Mark C.H. de Jong (Corresponding author), Bennert H.M. Smit, Mariëlle J. Meijer, Juriaan Lucassen, Henk J.M. Swagten, Bert Koopmans, Reinoud Lavrijsen (Corresponding author)

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

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Samenvatting

In this paper, we show that magnetic skyrmion nucleation can be controlled using Ga+ ion irradiation, which manipulates the magnetic interface effects (in particular, the magnetic anisotropy and Dzyaloshinskii-Moriya interaction) that govern the stability and energy cost of skyrmions in thin-film systems. We systematically and quantitatively investigate what effect these changes have on the nucleation of magnetic skyrmions. Our results indicate that the energy cost of skyrmion nucleation can be reduced up to 26% in the studied dose range and that it scales approximately linearly with the square root of the domain wall energy density. Moreover, the total number of nucleated skyrmions in irradiated devices after nucleation was found to depend linearly on the ion dose and could be doubled compared to nonirradiated devices. These results show that ion irradiation cannot only be used to enable local nucleation of skyrmions but also allows for fine control of the threshold and efficiency of the nucleation process.

Originele taal-2Engels
Artikelnummer094429
Aantal pagina's7
TijdschriftPhysical Review B
Volume107
Nummer van het tijdschrift9
DOI's
StatusGepubliceerd - 1 mrt. 2023

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© 2023 American Physical Society.

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