Opin vísindi

Atomistic spin simulations of electric-field-assisted nucleation and annihilation of magnetic skyrmions in Pd/Fe/Ir(111)

Show simple item record

dc.contributor Háskóli Íslands
dc.contributor University of Iceland
dc.contributor.author Goerzen, Moritz Alexander
dc.contributor.author von Malottki, Stephan
dc.contributor.author Kwiatkowski, Grzegorz
dc.contributor.author Bessarab, Pavel
dc.contributor.author Heinze, Stefan
dc.date.accessioned 2023-02-15T12:47:22Z
dc.date.available 2023-02-15T12:47:22Z
dc.date.issued 2022-06-27
dc.identifier.citation Goerzen, M.A., von Malottki, S., Kwiatkowski, G., Bessarab, P. & Heinze, S. (2022). Atomistic spin simulations of electric-field-assisted nucleation and annihilation of magnetic skyrmions in Pd/Fe/Ir(111). Physical Review B 105(214435). https://doi.org/10.1103/PhysRevB.105.214435
dc.identifier.issn 2469-9950
dc.identifier.issn 2469-9969
dc.identifier.uri https://hdl.handle.net/20.500.11815/3978
dc.description.abstract We provide a theoretical background for electric-field-assisted thermally activated writing and deleting of magnetic skyrmions in ultrathin transition-metal films. We apply an atomistic spin model, which includes the exchange interaction, the Dzyaloshinskii-Moriya interaction, and the magnetocrystalline anisotropy energy. The strengths of the magnetic interactions are taken from density functional theory (DFT) calculations for a Pd/Fe bilayer on the Ir(111) surface. We systematically vary all magnetic interactions up to $\pm10$~\% reating the magnetoelectric effect in linear response. The critical magnetic fields marking the onset of the skyrmion phase and the field-polarized phase shift considerably upon varying the interaction constants due to the electric field. Based on harmonic transition state theory, we calculate the transition rates for skyrmion nucleation and annihilation, which are in good agreement with experimental values for Pd/Fe/Ir(111). The field-dependent variation of energy barriers and preexponential factors leads to large changes of the transition rates, which are accompanied by changes in skyrmion radii. Finally, we simulate the electric-field-dependent writing and deleting of magnetic skyrmions in Pd/Fe/Ir(111) based on the master equation and transition rates obtained using the magnetic interactions calculated via DFT for electric fields of ${\cal E}= \pm 0.5$~V/{\AA}. The magnetic-field-dependent skyrmion probability follows a Fermi-Dirac distribution function of the free energy difference of the skyrmion state and the ferromagnetic (FM) state. The probability function for the opposite electric field directions is in striking agreement with experimental results [Romming {\it et al.}, Science {\bf 341}, 636 (2013)].
dc.description.sponsorship Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via Project No. 414321830 (HE3292/11-1), the Icelandic Research Fund (Grants No. 217750 and No. 184949), the University of Iceland Research Fund (Grant No. 15673), the Russian Science Foundation (Grant No. 19-72-10138), and the Swedish Research Council (Grant No. 2020-05110).
dc.format.extent 214435
dc.language.iso en
dc.publisher American Physical Society (APS)
dc.relation.ispartofseries Physical Review B;105(21)
dc.rights info:eu-repo/semantics/openAccess
dc.subject Master equation
dc.subject Heisenberg model
dc.subject Ultrathin films
dc.subject Noncollinear magnets
dc.subject Skyrmions
dc.subject Magnetoelectric effect
dc.subject Frustrated magnetism
dc.title Atomistic spin simulations of electric-field-assisted nucleation and annihilation of magnetic skyrmions in Pd/Fe/Ir(111)
dc.type info:eu-repo/semantics/article
dc.description.version Peer Reviewed
dc.identifier.journal Physical Review B
dc.identifier.doi 10.1103/PhysRevB.105.214435
dc.contributor.department Raunvísindastofnun (HÍ)
dc.contributor.department Science Institute (UI)
dc.contributor.school Verkfræði- og náttúruvísindasvið (HÍ)
dc.contributor.school School of Engineering and Natural Sciences (UI)

Files in this item

This item appears in the following Collection(s)

Show simple item record