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Lifetime of racetrack skyrmions
Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.;ITMO Univ, St Petersburg 197101, Russia..
Univ Iceland, Sci Inst, IS-107 Reykjavik, Iceland.;Forschungszentrum Julich, Peter Grunberg Inst, D-52425 Julich, Germany.;Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany.;JARA, D-52425 Julich, Germany..
ITMO Univ, St Petersburg 197101, Russia..
KTH Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden..
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2018 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 8, article id 3433Article in journal (Refereed) Published
Abstract [en]

The skyrmion racetrack is a promising concept for future information technology. There, binary bits are carried by nanoscale spin swirls-skyrmions-driven along magnetic strips. Stability of the skyrmions is a critical issue for realising this technology. Here we demonstrate that the racetrack skyrmion lifetime can be calculated from first principles as a function of temperature, magnetic field and track width. Our method combines harmonic transition state theory extended to include Goldstone modes, with an atomistic spin Hamiltonian parametrized from density functional theory calculations. We demonstrate that two annihilation mechanisms contribute to the skyrmion stability: At low external magnetic field, escape through the track boundary prevails, but a crossover field exists, above which the collapse in the interior becomes dominant. Considering a Pd/Fe bilayer on an Ir(111) substrate as a well-established model system, the calculated skyrmion lifetime is found to be consistent with reported experimental measurements. Our simulations also show that the Arrhenius pre-exponential factor of escape depends only weakly on the external magnetic field, whereas the pre-exponential factor for collapse is strongly field dependent. Our results open the door for predictive simulations, free from empirical parameters, to aid the design of skyrmion-based information technology.

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NATURE PUBLISHING GROUP , 2018. Vol. 8, article id 3433
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URN: urn:nbn:se:uu:diva-349347DOI: 10.1038/s41598-018-21623-3ISI: 000425590600057PubMedID: 29467438OAI: oai:DiVA.org:uu-349347DiVA, id: diva2:1201847
Funder
Göran Gustafsson Foundation for Research in Natural Sciences and MedicineSwedish Research CouncilCarl Tryggers foundation EU, Horizon 2020, 665095-FETSwedish Energy AgencyAvailable from: 2018-04-26 Created: 2018-04-26 Last updated: 2018-04-26Bibliographically approved

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Delin, Anna

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