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The effect of confinement and defects on the thermal stability of skyrmions
St. Petersburg State University, Russia;ITMO University, Russia.
St. Petersburg State University, Russia;University of Iceland, Iceland.
ITMO University, Russia.
ITMO University, Russia;University of Iceland, Iceland.ORCID iD: 0000-0003-3351-7172
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2018 (English)In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 549, p. 6-9Article in journal (Refereed) Published
Abstract [en]

The stability of magnetic skyrmions against thermal fluctuations and external perturbations is investigated within the framework of harmonic transition state theory for magnetic degrees of freedom. The influence of confined geometry and atomic scale non-magnetic defects on the skyrmion lifetime is estimated. It is shown that a skyrmion on a track has lower activation energy for annihilation and higher energy for nucleation if the size of the skyrmion is comparable with the width of the track. Two mechanisms of skyrmion annihilation are considered: inside the track and escape through the boundary. For both mechanisms, the dependence of activation energy on the track width is calculated. Non-magnetic defects are found to localize skyrmions in their neighborhood and strongly decrease the activation energy for creation and annihilation. This is in agreement with experimental measurements that have found nucleation of skyrmions in presence of spin-polarized current preferably occurring near structural defects.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 549, p. 6-9
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
URN: urn:nbn:se:lnu:diva-116391DOI: 10.1016/j.physb.2017.09.040ISI: 000452277400002Scopus ID: 2-s2.0-85029577272OAI: oai:DiVA.org:lnu-116391DiVA, id: diva2:1697294
Conference
11th International Symposium on Hysteresis Modeling and Micromagnetics (HMM 2017)
Available from: 2022-09-20 Created: 2022-09-20 Last updated: 2022-10-11Bibliographically approved

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Bessarab, Pavel F.

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