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Increased lifetime of metastable skyrmions by controlled doping

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Birch, M. T., Takagi, R., Seki, S., Wilson, M. N., Kagawa, F., Štefančič, Aleš, Balakrishnan, Geetha, Fay, R., Steadman, P., Ottley, C. J., Crisanti, Marta, Cubitt, R., Lancaster, T., Tokura, Y. and Hatton, P. D. (2019) Increased lifetime of metastable skyrmions by controlled doping. Physical Review B, 100 (1). 014425. doi:10.1103/PhysRevB.100.014425

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Official URL: http://dx.doi.org/10.1103/PhysRevB.100.014425

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Abstract

Previous observations of metastable magnetic skyrmions have shown that close to the equilibrium pocket the metastable state has a short lifetime, and therefore, rapid cooling is required to generate a significant skyrmion population at low temperatures. Here, we report that the lifetime of metastable skyrmions in crystals of Cu2OSeO3 is extended by a factor of 50 with the introduction of only 2.5% zinc doping, allowing over 50% of the population to survive when field cooling at a rate of just 1 K/min. Our systematic study suggests that the lifetime enhancement is due to the increase in the pinning site density, rather than an alteration to the energy barrier of the decay process. We expect that doping can be exploited to control the lifetime of the metastable SkL state in other chiral magnets, offering a method of engineering skyrmion materials towards application in future devices.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Skyrme model, Magnetic materials
Journal or Publication Title: Physical Review B
Publisher: American Physical Society
ISSN: 2469-9950
Official Date: 22 July 2019
Dates:
DateEvent
22 July 2019Published
22 July 2019Accepted
11 June 2019Modified
29 November 2018Submitted
Volume: 100
Number: 1
Article Number: 014425
DOI: 10.1103/PhysRevB.100.014425
Status: Peer Reviewed
Publication Status: Published
Publisher Statement: © 2019 American Physical Society
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: © 2019 American Physical Society
Funder: EPSRC Engineering and Physical Sciences Research Council
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/N032128/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
UNSPECIFIEDSōgō Kenkyū Daigakuin Daigakuhttp://viaf.org/viaf/141733422
18H03685[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
17H05186[JSPS] Japan Society for the Promotion of Sciencehttp://dx.doi.org/10.13039/501100001691
UNSPECIFIED[NSERC] Natural Sciences and Engineering Research Council of Canadahttp://dx.doi.org/10.13039/501100000038

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