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Skyrmion lifetime in ultrathin films
Univ Kiel, Inst Theoret Phys & Astrophys, Leibnizstr 15, D-24098 Kiel, Germany.
Univ Kiel, Inst Theoret Phys & Astrophys, Leibnizstr 15, D-24098 Kiel, Germany;ITMO Univ, St Petersburg 197101, Russia.
Univ Kiel, Inst Theoret Phys & Astrophys, Leibnizstr 15, D-24098 Kiel, Germany.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. KTH, Dept Appl Phys, Kista, Sweden;KTH Royal Inst Technol, Swedish E Sci Res Ctr SeRC, SE-10044 Stockholm, Sweden.
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2019 (English)In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 99, no 6, article id 060409Article in journal (Refereed) Published
Abstract [en]

We show that thermal stability of skyrmions due to entropic effects can be strongly affected by external control parameters such as magnetic field and interface composition. The lifetimes of isolated skyrmions in atomic Pd/Fe bilayers on Ir(111) and on Rh(111) are calculated in the framework of harmonic transition state theory based on an atomistic spin model parametrized from density functional theory. Depending on the system the attempt frequency for skyrmion collapse can change by up to nine orders of magnitude with the strength of the applied magnetic field. We demonstrate that this effect is due to a drastic change of entropy with skyrmion radius which opens a route toward stabilizing sub-10-nm skyrmions at room temperature.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2019. Vol. 99, no 6, article id 060409
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Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-379586DOI: 10.1103/PhysRevB.99.060409ISI: 000459933200003OAI: oai:DiVA.org:uu-379586DiVA, id: diva2:1296988
Funder
EU, Horizon 2020, 665095Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-03-18Bibliographically approved

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Delin, Anna

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