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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..
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Material Physics. KTH, Centres, SeRC - Swedish e-Science Research Centre. Uppsala Univ, Dept Phys & Astron, Uppsala, Sweden.ORCID iD: 0000-0001-7788-6127
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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.

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AMER PHYSICAL SOC , 2019. Vol. 99, no 6, article id 060409
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URN: urn:nbn:se:kth:diva-246256DOI: 10.1103/PhysRevB.99.060409ISI: 000459933200003Scopus ID: 2-s2.0-85062498277OAI: oai:DiVA.org:kth-246256DiVA, id: diva2:1300922
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QC 20190401

Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2019-04-04Bibliographically approved

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Delin, Anna

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