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

Mark C.H. de Jong; Mariëlle J. Meijer; Juriaan Lucassen; Jos van Liempt; Henk J.M. Swagten; Bert Koopmans; Reinoud Lavrijsen

doi:10.1103/PhysRevB.105.064429

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 language	English
Article number	064429
Number of pages	10
Journal	Physical Review B
Volume	105
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevB.105.064429
Publication status	Published - 23 Feb 2022

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

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 N{\'e}el 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.",

author = "{de Jong}, {Mark C.H.} and Meijer, {Mari{\"e}lle J.} and Juriaan Lucassen and {van Liempt}, Jos and Swagten, {Henk J.M.} and Bert Koopmans and Reinoud Lavrijsen",

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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doi = "10.1103/PhysRevB.105.064429",

language = "English",

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Local control of magnetic interface effects in chiral Ir| Co| Pt multilayers using Ga+ ion irradiation. / de Jong, Mark C.H. (Corresponding author); Meijer, Mariëlle J.; Lucassen, Juriaan; van Liempt, Jos; Swagten, Henk J.M.; Koopmans, Bert ; Lavrijsen, Reinoud.

In: Physical Review B, Vol. 105, No. 6, 064429, 23.02.2022.

Research output: Contribution to journal › Article › Academic › peer-review

TY - JOUR

T1 - Local control of magnetic interface effects in chiral Ir| Co| Pt multilayers using Ga+ ion irradiation

AU - de Jong, Mark C.H.

AU - Meijer, Mariëlle J.

AU - Lucassen, Juriaan

AU - van Liempt, Jos

AU - Swagten, Henk J.M.

AU - Koopmans, Bert

AU - Lavrijsen, Reinoud

N1 - 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.

PY - 2022/2/23

Y1 - 2022/2/23

N2 - 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.

AB - 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.

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

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