kth.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Lifetime of racetrack skyrmions
KTH, School of Engineering Sciences (SCI), Physics, Statistical Physics.
Show others and affiliations
2018 (English)In: Scientific Reports, 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.

Place, publisher, year, edition, pages
NATURE PUBLISHING GROUP , 2018. Vol. 8, article id 3433
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-224023DOI: 10.1038/s41598-018-21623-3ISI: 000425590600057PubMedID: 29467438Scopus ID: 2-s2.0-85042361199OAI: oai:DiVA.org:kth-224023DiVA, id: diva2:1192741
Note

QC 20180323

Available from: 2018-03-23 Created: 2018-03-23 Last updated: 2022-09-15Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textPubMedScopus

Authority records

Rybakov, Filipp N.Bergqvist, LarsDelin, Anna

Search in DiVA

By author/editor
Rybakov, Filipp N.Bergqvist, LarsDelin, Anna
By organisation
Statistical PhysicsApplied Material PhysicsSeRC - Swedish e-Science Research Centre
In the same journal
Scientific Reports
Physical Sciences

Search outside of DiVA

GoogleGoogle Scholar

doi
pubmed
urn-nbn

Altmetric score

doi
pubmed
urn-nbn
Total: 597 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf