Local control of magnetic interface effects in chiral Ir| Co| Pt multilayers using Ga+ ion irradiation

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

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Abstract

In this work we investigate local tuning of the iDMI and perpendicular magnetic anisotropy (PMA) using focused Ga+ ion beam irradiation, in an Ir|Co|Pt multilayer system. We show that the magnitude of the interface contribution to both effects can be significantly reduced by the irradiation with Ga+ ions. This leads to a reduction by a factor of 2 of the domain wall energy density, while still preserving the Néel character of the domain walls. Hence, we postulate that Ga+ ion irradiation is an effective way to locally reduce the energy barrier for skyrmion nucleation, providing a novel pathway for targeted skyrmion nucleation in racetrack type devices.

Original languageEnglish
Article number064429
Number of pages10
JournalPhysical Review B
Volume105
Issue number6
DOIs
Publication statusPublished - 23 Feb 2022

Bibliographical note

Funding Information:
This work is part of the Gravitation programme “Research Centre for Integrated Nanophotonics,” which is financed by the Netherlands Organisation for Scientific Research (NWO). M.J.M. and J.L. acknowledge support as part of the research programme of the Foundation for Fundamental Research on Matter (FOM), which is a part of NWO.

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