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Tuning skyrmions in B20 compounds by 4d and 5d doping
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
KTH Royal Inst Technol, AlbaNova Univ Ctr, Sch Engn Sci, Dept Appl Phys, SE-10691 Stockholm, Sweden.;KTH Royal Inst Technol, SeRC Swedish Sci Res Ctr, SE-10044 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry.ORCID iD: 0000-0002-0096-4366
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2022 (English)In: Physical Review Materials, E-ISSN 2475-9953, Vol. 6, no 8, article id 084401Article in journal (Refereed) Published
Abstract [en]

Skyrmion stabilization in novel magnetic systems with the B20 crystal structure is reported here, primarily based on theoretical results. The focus is on the effect of alloying on the 3d sublattice of the B20 structure by substitution of heavier 4d and 5d elements, with the ambition to tune the spin-orbit coupling and its influence on magnetic interactions. State-of-the-art methods based on density functional theory are used to calculate both isotropic and anisotropic exchange interactions. Significant enhancement of the Dzyaloshinskii-Moriya interaction is reported for 5d-doped FeSi and CoSi, accompanied by a large modification of the spin stiffness and spiralization. Micromagnetic simulations coupled to atomistic spin-dynamics and ab initio magnetic interactions reveal the spin-spiral nature of the magnetic ground state and field-induced skyrmions for all these systems. Especially small skyrmions similar to 50 nm are predicted for Co0.75Os0.25Si, compared to similar to 148 nm for Fe0.75Co0.25Si. Convex-hull analysis suggests that all B20 compounds considered here are structurally stable at elevated temperatures and should be possible to synthesize. This prediction is confirmed experimentally by synthesis and structural analysis of the Ru-doped CoSi systems discussed here, both in powder and in single-crystal forms.

Place, publisher, year, edition, pages
American Physical Society (APS) American Physical Society, 2022. Vol. 6, no 8, article id 084401
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-482695DOI: 10.1103/PhysRevMaterials.6.084401ISI: 000838143600001OAI: oai:DiVA.org:uu-482695DiVA, id: diva2:1691550
Funder
Knut and Alice Wallenberg Foundation, 2018.0060Swedish Research Council, 2018-05973Swedish Foundation for Strategic Research, EM-160039Swedish Energy AgencyEU, European Research Council, 854843-FASTCORRStandUpeSSENCE - An eScience CollaborationSwedish Research Council, 201903666Swedish Research Council, 2019-00645Swedish Research Council, 2015-04608Swedish Research Council, 2016-05980Swedish Research Council, 2019-05304Available from: 2022-08-30 Created: 2022-08-30 Last updated: 2024-01-15Bibliographically approved

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Borisov, VladislavNtallis, NikolaosClulow, RebeccaShtender, VitaliiSahlberg, MartinThonig, DannyPereiro, ManuelBergman, AndersEriksson, Olle

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