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Tunable topological magnetism in superlattices of nonmagnetic B20 systems
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.ORCID iD: 0000-0001-7409-2196
KTH Royal Inst Technol, Sch Engn Sci, Albanova Univ Ctr, Dept Appl Phys, SE-10691 Stockholm, Sweden.;KTH Royal Inst Technol, Wallenberg Initiat Mat Sci Sustainabil WISE, SE-10044 Stockholm, Sweden.;KTH Royal Inst Technol, Swedish E sci Res Ctr, SeRC, SE-10044 Stockholm, Sweden..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Physics. Uppsala Univ, Wallenberg Initiat Mat Sci Sustainabil, S-75121 Uppsala, Sweden..ORCID iD: 0000-0001-5111-1374
2024 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 110, no 6, article id L060407Article in journal (Refereed) Published
Abstract [en]

We predict topological magnetic properties of B20 systems, that are organized in atomically thin multilayers. In particular, we focus on FeSi/CoSi / CoSi and FeSi/FeGe / FeGe superlattices with different numbers of layers and interface structures. We demonstrate that the absence of long-range magnetic order, previously observed in bulk FeSi and CoSi, is broken near the FeSi/CoSi / CoSi interface, where a magnetic state with a nontrivial topological texture appears. Using the Heisenberg and Dzyaloshinskii-Moriya (DM) interactions calculated from first principles, we perform finite-temperature atomistic spin dynamics simulations for up to 2 x 106 6 spins to capture the complexity of noncollinear textures. Our simulations predict the formation of antiskyrmions in a [001]-oriented FeSi/CoSi / CoSi multilayer, intermediate skyrmions in a [111]-oriented FeSi/CoSi / CoSi system, and Bloch skyrmions in the FeSi/FeGe / FeGe (001) system, with a size between 7 and 37 nm. These varieties of topological magnetic textures in the studied systems can be attributed to the complex asymmetric structure of the DM matrix, which is different from previously known magnetic materials. We demonstrate that through structural engineering both ferromagnetic and antiferromagnetic skyrmions can be stabilized, where the latter are especially appealing for applications due to the zero skyrmion Hall effect. The proposed B20 multilayers show a potential for further exploration and call for experimental confirmation.

Place, publisher, year, edition, pages
American Physical Society, 2024. Vol. 110, no 6, article id L060407
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-537099DOI: 10.1103/PhysRevB.110.L060407ISI: 001290947300001OAI: oai:DiVA.org:uu-537099DiVA, id: diva2:1892509
Funder
Knut and Alice Wallenberg Foundation, 2018.0060Knut and Alice Wallenberg Foundation, 2021.0246Knut and Alice Wallenberg Foundation, 2022.0108Knut and Alice Wallenberg FoundationSwedish Research Council, 2016-05980Swedish Research Council, 2019-05304Swedish Research CouncilSwedish Foundation for Strategic ResearchSwedish Energy AgencyEU, European Research Council, 854843-FASTCORRStandUpSwedish Research CouncilSwedish Research Council, 2018-05973Available from: 2024-08-27 Created: 2024-08-27 Last updated: 2024-08-27Bibliographically approved

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